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<a href="#func-members">Functions</a> </div>
<div class="headertitle"><div class="title">Dataset Transfer Properties<div class="ingroups"><a class="el" href="group___h5_p.html">Property Lists (H5P)</a></div></div></div>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Use dataset transfer properties to customize certain aspects of reading and writing datasets such as transformations, MPI-IO I/O mode, error detection, etc. These properties are <em>not</em> persisted with datasets, and can be adjusted at runtime before a dataset is read or written. </p><div></div><div> <a class="anchor" id="table_dxpl_id"></a>
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<caption border="1" style="background-color:whitesmoke;">Data transfer property list functions (H5P)</caption>
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<th>C Function </th><th>Purpose </th></tr>
<tr>
<td><a class="el" href="#ga51d126d64fa766d44160a95057a2c733" title="Sets B-tree split ratios for a dataset transfer property list.">H5Pset_btree_ratios</a>/<a class="el" href="#ga3f3df48ce44b6af7517654b23a37fa02" title="Gets B-tree split ratios for a dataset transfer property list.">H5Pget_btree_ratios</a> </td><td>Sets/gets B-tree split ratios for a dataset transfer property list. </td></tr>
<tr>
<td><a class="el" href="#ga777e8c171c9e462230a9fa40874b38ce" title="Sets type conversion and background buffers.">H5Pset_buffer</a> </td><td>Maximum size for the type conversion buffer and the background buffer. May also supply pointers to application-allocated buffers. </td></tr>
<tr>
<td><a class="el" href="#gaa8c317b6164ae22a6ddae4131bbbcd22" title="Sets a data transform expression.">H5Pset_data_transform</a>/<a class="el" href="#ga865b05218e704578fe8db0c9dec07b25" title="Retrieves a data transform expression.">H5Pget_data_transform</a> </td><td>Sets/gets a data transform expression. </td></tr>
<tr>
<td><a class="el" href="#gadd73dca2b824491cbe768028d7377b2f" title="Sets a hyperslab file selection for a dataset I/O operation.">H5Pset_dataset_io_hyperslab_selection</a> </td><td>Sets a hyperslab file selection for a dataset I/O operation. </td></tr>
<tr>
<td><a class="el" href="#ga0d95dfa506784acc9aed850c99713609" title="Sets the dataset transfer property list to enable or disable error detection when reading data.">H5Pset_edc_check</a>/<a class="el" href="#gabc2b1e2af542ac15ee1613f4f89117e1" title="Determines whether error-detection is enabled for dataset reads.">H5Pget_edc_check</a> </td><td>Sets/gets whether to enable error-detection when reading a dataset. </td></tr>
<tr>
<td><a class="el" href="#gad8c1582c86e3316c70b0658b3b8e2071" title="Sets number of I/O vectors to be read/written in hyperslab I/O.">H5Pset_hyper_vector_size</a> </td><td>set the number of "I/O vectors" (offset and length pairs) which are to be accumulated in memory before being issued to the lower levels of the library for reading or writing the actual data. </td></tr>
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<td><a class="el" href="#ga1890e730c34efa20cd6a5d1d2a0e8caa" title="Sets user-defined filter callback function.">H5Pset_filter_callback</a> </td><td>Sets user-defined filter callback function. </td></tr>
<tr>
<td><a class="el" href="#gad8c1582c86e3316c70b0658b3b8e2071" title="Sets number of I/O vectors to be read/written in hyperslab I/O.">H5Pset_hyper_vector_size</a>/<a class="el" href="#gaa55e7a6dd26a8df51b331febfeeb376b" title="Retrieves number of I/O vectors to be read/written in hyperslab I/O.">H5Pget_hyper_vector_size</a> </td><td>Sets/gets number of I/O vectors to be read/written in hyperslab I/O. </td></tr>
<tr>
<td><a class="el" href="#ga10a80b29444d933da1aa2003f46cf003" title="Sets user-defined datatype conversion callback function.">H5Pset_type_conv_cb</a>/<a class="el" href="#gae8c8557d303fa914b569da0182284e89" title="Gets user-defined datatype conversion callback function.">H5Pget_type_conv_cb</a> </td><td>Sets/gets user-defined datatype conversion callback function. </td></tr>
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<td><a class="el" href="#ga2220ab75de470b6a6d5b1173d12aa0cf" title="Sets the memory manager for variable-length datatype allocation in H5Dread() and H5Dvlen_reclaim()">H5Pset_vlen_mem_manager</a>/<a class="el" href="#ga9de8cad8b5664a956d965fd9414c376e" title="Gets the memory manager for variable-length datatype allocation in H5Dread() and H5Dvlen_reclaim()">H5Pget_vlen_mem_manager</a> </td><td>Sets/gets the memory manager for variable-length datatype allocation in <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread</a> and <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim</a>. </td></tr>
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<td><a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e" title="Sets data transfer mode.">H5Pset_dxpl_mpio</a>/<a class="el" href="#gab66eca0259c33d575b4050eebfb6f2cd" title="Returns the data transfer mode.">H5Pget_dxpl_mpio</a> </td><td>Sets/gets data transfer mode. </td></tr>
<tr>
<td><a class="el" href="#gadc911ad42f580ce2df327383188ed4ba" title="Sets a flag specifying linked-chunk I/O or multi-chunk I/O.">H5Pset_dxpl_mpio_chunk_opt</a> </td><td>Sets a flag specifying linked-chunk I/O or multi-chunk I/O. </td></tr>
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<td><a class="el" href="#gaaf5f3432a7d1a1c3f8e3eee6a3dc9810" title="Sets a numeric threshold for linked-chunk I/O.">H5Pset_dxpl_mpio_chunk_opt_num</a> </td><td>Sets a numeric threshold for linked-chunk I/O. </td></tr>
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<td><a class="el" href="#ga0b53b19c37bda96d3578ce38b3858ea3" title="Sets a ratio threshold for collective I/O.">H5Pset_dxpl_mpio_chunk_opt_ratio</a> </td><td>Sets a ratio threshold for collective I/O. </td></tr>
<tr>
<td><a class="el" href="#gacb30d14d1791ec7ff9ee73aa148a51a3" title="Sets low-level data transfer mode.">H5Pset_dxpl_mpio_collective_opt</a> </td><td>Sets a flag governing the use of independent versus collective I/O. </td></tr>
<tr>
<td><a class="el" href="#ga37ec8c3b3f1880ed6e1b300bc4ee9ed5" title="Retrieves the type of chunk optimization that HDF5 actually performed on the last parallel I/O call (...">H5Pget_mpio_actual_chunk_opt_mode</a> </td><td>Gets the type of chunk optimization that HDF5 actually performed on the last parallel I/O call. </td></tr>
<tr>
<td><a class="el" href="#ga20efee54f7e69f5ececa0d3c752d3344" title="Retrieves the type of I/O that HDF5 actually performed on the last parallel I/O call (not necessarily...">H5Pget_mpio_actual_io_mode</a> </td><td>Gets the type of I/O that HDF5 actually performed on the last parallel I/O call. </td></tr>
<tr>
<td><a class="el" href="#ga29707de7c06733295086daa3a2db4979" title="Retrieves local and global causes that broke collective I/O on the last parallel I/O call.">H5Pget_mpio_no_collective_cause</a> </td><td>Gets local and global causes that broke collective I/O on the last parallel I/O call. </td></tr>
<tr>
<td><a class="el" href="#ga7d4d11c9c273d5a5ce2d174d66e4fa10" title="Sets the selection I/O mode.">H5Pset_selection_io</a>/<a class="el" href="#ga324f2407a698f376c9970331dd8c8d16" title="Retrieves the selection I/O mode.">H5Pget_selection_io</a> </td><td>Sets/gets the selection I/O mode. </td></tr>
<tr>
<td><a class="el" href="#gad6fa6bfa5956e8c0bd69c22bde65f84c" title="Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call.">H5Pget_no_selection_io_cause</a> </td><td>Gets the cause for not performing selection or vector I/O on the last parallel I/O call. </td></tr>
<tr>
<td><a class="el" href="#ga252fe801869970c14a5e800a1ea7ab84" title="Retrieves the type(s) of I/O that HDF5 actually performed on raw data during the last I/O call.">H5Pget_actual_selection_io_mode</a> </td><td>Gets the type(s) (scalar, vector, selection) of raw data I/O performed on the last I/O call. </td></tr>
<tr>
<td><a class="el" href="#ga6f65ca81d8a10015513a69fe76c5d542" title="Allows the library to modify the contents of the write buffer.">H5Pset_modify_write_buf</a>/<a class="el" href="#ga7a3e4d3f7b5c276873d00af3f92cdc22" title="Retrieves the "modify write buffer" property.">H5Pget_modify_write_buf</a> </td><td>Sets/gets a flag allowing the library to modify the contents of the write buffer. </td></tr>
<tr>
<td>H5Pset_preserve/H5Pget_preserve </td><td>No longer available, deprecated as it no longer has any effect. </td></tr>
</table>
</div><div> </div> <table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga001a22b64f60b815abf5de8b4776f09e" id="r_ga001a22b64f60b815abf5de8b4776f09e"><td class="memItemLeft" align="right" valign="top">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e">H5Pset_dxpl_mpio</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, <a class="el" href="_h5_f_dmpi_8h.html#a99bc5a964089fea144e7056b004bcc16">H5FD_mpio_xfer_t</a> xfer_mode)</td></tr>
<tr class="memdesc:ga001a22b64f60b815abf5de8b4776f09e"><td class="mdescLeft"> </td><td class="mdescRight">Sets data transfer mode. <br /></td></tr>
<tr class="separator:ga001a22b64f60b815abf5de8b4776f09e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab66eca0259c33d575b4050eebfb6f2cd" id="r_gab66eca0259c33d575b4050eebfb6f2cd"><td class="memItemLeft" align="right" valign="top">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gab66eca0259c33d575b4050eebfb6f2cd">H5Pget_dxpl_mpio</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, <a class="el" href="_h5_f_dmpi_8h.html#a99bc5a964089fea144e7056b004bcc16">H5FD_mpio_xfer_t</a> *xfer_mode)</td></tr>
<tr class="memdesc:gab66eca0259c33d575b4050eebfb6f2cd"><td class="mdescLeft"> </td><td class="mdescRight">Returns the data transfer mode. <br /></td></tr>
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<tr class="memitem:gacb30d14d1791ec7ff9ee73aa148a51a3" id="r_gacb30d14d1791ec7ff9ee73aa148a51a3"><td class="memItemLeft" align="right" valign="top">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gacb30d14d1791ec7ff9ee73aa148a51a3">H5Pset_dxpl_mpio_collective_opt</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, <a class="el" href="_h5_f_dmpi_8h.html#afaf7d5667632176e8daca47549e29fb8">H5FD_mpio_collective_opt_t</a> opt_mode)</td></tr>
<tr class="memdesc:gacb30d14d1791ec7ff9ee73aa148a51a3"><td class="mdescLeft"> </td><td class="mdescRight">Sets low-level data transfer mode. <br /></td></tr>
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<tr class="memitem:gadc911ad42f580ce2df327383188ed4ba" id="r_gadc911ad42f580ce2df327383188ed4ba"><td class="memItemLeft" align="right" valign="top">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gadc911ad42f580ce2df327383188ed4ba">H5Pset_dxpl_mpio_chunk_opt</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, <a class="el" href="_h5_f_dmpi_8h.html#aad0ca234af678f0f0976d810ee2bf246">H5FD_mpio_chunk_opt_t</a> opt_mode)</td></tr>
<tr class="memdesc:gadc911ad42f580ce2df327383188ed4ba"><td class="mdescLeft"> </td><td class="mdescRight">Sets a flag specifying linked-chunk I/O or multi-chunk I/O. <br /></td></tr>
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<tr class="memitem:gaaf5f3432a7d1a1c3f8e3eee6a3dc9810" id="r_gaaf5f3432a7d1a1c3f8e3eee6a3dc9810"><td class="memItemLeft" align="right" valign="top">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaaf5f3432a7d1a1c3f8e3eee6a3dc9810">H5Pset_dxpl_mpio_chunk_opt_num</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, unsigned num_chunk_per_proc)</td></tr>
<tr class="memdesc:gaaf5f3432a7d1a1c3f8e3eee6a3dc9810"><td class="mdescLeft"> </td><td class="mdescRight">Sets a numeric threshold for linked-chunk I/O. <br /></td></tr>
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<tr class="memitem:ga0b53b19c37bda96d3578ce38b3858ea3" id="r_ga0b53b19c37bda96d3578ce38b3858ea3"><td class="memItemLeft" align="right" valign="top">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga0b53b19c37bda96d3578ce38b3858ea3">H5Pset_dxpl_mpio_chunk_opt_ratio</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, unsigned percent_num_proc_per_chunk)</td></tr>
<tr class="memdesc:ga0b53b19c37bda96d3578ce38b3858ea3"><td class="mdescLeft"> </td><td class="mdescRight">Sets a ratio threshold for collective I/O. <br /></td></tr>
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<tr class="memitem:ga3f3df48ce44b6af7517654b23a37fa02" id="r_ga3f3df48ce44b6af7517654b23a37fa02"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga3f3df48ce44b6af7517654b23a37fa02">H5Pget_btree_ratios</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, double *left, double *middle, double *right)</td></tr>
<tr class="memdesc:ga3f3df48ce44b6af7517654b23a37fa02"><td class="mdescLeft"> </td><td class="mdescRight">Gets B-tree split ratios for a dataset transfer property list. <br /></td></tr>
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<tr class="memitem:ga1278b9979cc833e77d699cc878c6dab4" id="r_ga1278b9979cc833e77d699cc878c6dab4"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga1278b9979cc833e77d699cc878c6dab4">H5Pget_buffer</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, void **tconv, void **bkg)</td></tr>
<tr class="memdesc:ga1278b9979cc833e77d699cc878c6dab4"><td class="mdescLeft"> </td><td class="mdescRight">Reads buffer settings. <br /></td></tr>
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<tr class="memitem:ga865b05218e704578fe8db0c9dec07b25" id="r_ga865b05218e704578fe8db0c9dec07b25"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#af629ed855824cf5955b54529adf78ad6">ssize_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga865b05218e704578fe8db0c9dec07b25">H5Pget_data_transform</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, char *expression, size_t size)</td></tr>
<tr class="memdesc:ga865b05218e704578fe8db0c9dec07b25"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves a data transform expression. <br /></td></tr>
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<tr class="memitem:gabc2b1e2af542ac15ee1613f4f89117e1" id="r_gabc2b1e2af542ac15ee1613f4f89117e1"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___f_l_e_t_c_h_e_r32.html#ga5217bb01cd38dbfc4c5c8cad39c01a08">H5Z_EDC_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gabc2b1e2af542ac15ee1613f4f89117e1">H5Pget_edc_check</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id)</td></tr>
<tr class="memdesc:gabc2b1e2af542ac15ee1613f4f89117e1"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether error-detection is enabled for dataset reads. <br /></td></tr>
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<tr class="memitem:gaa55e7a6dd26a8df51b331febfeeb376b" id="r_gaa55e7a6dd26a8df51b331febfeeb376b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaa55e7a6dd26a8df51b331febfeeb376b">H5Pget_hyper_vector_size</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> fapl_id, size_t *size)</td></tr>
<tr class="memdesc:gaa55e7a6dd26a8df51b331febfeeb376b"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves number of I/O vectors to be read/written in hyperslab I/O. <br /></td></tr>
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<tr class="memitem:gacca1a094d70c3b2277175145142fda10" id="r_gacca1a094d70c3b2277175145142fda10"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#gacca1a094d70c3b2277175145142fda10">H5Pget_preserve</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id)</td></tr>
<tr class="memdesc:gacca1a094d70c3b2277175145142fda10"><td class="mdescLeft"> </td><td class="mdescRight">Checks status of the dataset transfer property list (<b>DEPRECATED</b>) <br /></td></tr>
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<tr class="memitem:gae8c8557d303fa914b569da0182284e89" id="r_gae8c8557d303fa914b569da0182284e89"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gae8c8557d303fa914b569da0182284e89">H5Pget_type_conv_cb</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, <a class="el" href="_h5_tpublic_8h.html#a8825c3dcb04c35a26f8709791b1fdb5e">H5T_conv_except_func_t</a> *op, void **operate_data)</td></tr>
<tr class="memdesc:gae8c8557d303fa914b569da0182284e89"><td class="mdescLeft"> </td><td class="mdescRight">Gets user-defined datatype conversion callback function. <br /></td></tr>
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<tr class="memitem:ga9de8cad8b5664a956d965fd9414c376e" id="r_ga9de8cad8b5664a956d965fd9414c376e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga9de8cad8b5664a956d965fd9414c376e">H5Pget_vlen_mem_manager</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_m_mpublic_8h.html#a5fd832e4b7f42f93364153cb823e7ffa">H5MM_allocate_t</a> *alloc_func, void **alloc_info, <a class="el" href="_h5_m_mpublic_8h.html#aa34c7616be59673cfc3d63fa7d960f25">H5MM_free_t</a> *free_func, void **free_info)</td></tr>
<tr class="memdesc:ga9de8cad8b5664a956d965fd9414c376e"><td class="mdescLeft"> </td><td class="mdescRight">Gets the memory manager for variable-length datatype allocation in <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread()</a> and <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim()</a> <br /></td></tr>
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<tr class="memitem:ga51d126d64fa766d44160a95057a2c733" id="r_ga51d126d64fa766d44160a95057a2c733"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga51d126d64fa766d44160a95057a2c733">H5Pset_btree_ratios</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, double left, double middle, double right)</td></tr>
<tr class="memdesc:ga51d126d64fa766d44160a95057a2c733"><td class="mdescLeft"> </td><td class="mdescRight">Sets B-tree split ratios for a dataset transfer property list. <br /></td></tr>
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<tr class="memitem:ga777e8c171c9e462230a9fa40874b38ce" id="r_ga777e8c171c9e462230a9fa40874b38ce"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga777e8c171c9e462230a9fa40874b38ce">H5Pset_buffer</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, size_t size, void *tconv, void *bkg)</td></tr>
<tr class="memdesc:ga777e8c171c9e462230a9fa40874b38ce"><td class="mdescLeft"> </td><td class="mdescRight">Sets type conversion and background buffers. <br /></td></tr>
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<tr class="memitem:gaa8c317b6164ae22a6ddae4131bbbcd22" id="r_gaa8c317b6164ae22a6ddae4131bbbcd22"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaa8c317b6164ae22a6ddae4131bbbcd22">H5Pset_data_transform</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, const char *expression)</td></tr>
<tr class="memdesc:gaa8c317b6164ae22a6ddae4131bbbcd22"><td class="mdescLeft"> </td><td class="mdescRight">Sets a data transform expression. <br /></td></tr>
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<tr class="memitem:ga0d95dfa506784acc9aed850c99713609" id="r_ga0d95dfa506784acc9aed850c99713609"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga0d95dfa506784acc9aed850c99713609">H5Pset_edc_check</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="group___f_l_e_t_c_h_e_r32.html#ga5217bb01cd38dbfc4c5c8cad39c01a08">H5Z_EDC_t</a> check)</td></tr>
<tr class="memdesc:ga0d95dfa506784acc9aed850c99713609"><td class="mdescLeft"> </td><td class="mdescRight">Sets the dataset transfer property list to enable or disable error detection when reading data. <br /></td></tr>
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<tr class="memitem:ga1890e730c34efa20cd6a5d1d2a0e8caa" id="r_ga1890e730c34efa20cd6a5d1d2a0e8caa"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga1890e730c34efa20cd6a5d1d2a0e8caa">H5Pset_filter_callback</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_zpublic_8h.html#a3b2331dc3dab96f25a94b6dd7675507c">H5Z_filter_func_t</a> func, void *op_data)</td></tr>
<tr class="memdesc:ga1890e730c34efa20cd6a5d1d2a0e8caa"><td class="mdescLeft"> </td><td class="mdescRight">Sets user-defined filter callback function. <br /></td></tr>
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<tr class="memitem:gad8c1582c86e3316c70b0658b3b8e2071" id="r_gad8c1582c86e3316c70b0658b3b8e2071"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gad8c1582c86e3316c70b0658b3b8e2071">H5Pset_hyper_vector_size</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, size_t size)</td></tr>
<tr class="memdesc:gad8c1582c86e3316c70b0658b3b8e2071"><td class="mdescLeft"> </td><td class="mdescRight">Sets number of I/O vectors to be read/written in hyperslab I/O. <br /></td></tr>
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<tr class="memitem:gae8b87209ba6a3943eb614b6dfe55e588" id="r_gae8b87209ba6a3943eb614b6dfe55e588"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gae8b87209ba6a3943eb614b6dfe55e588">H5Pset_preserve</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> status)</td></tr>
<tr class="memdesc:gae8b87209ba6a3943eb614b6dfe55e588"><td class="mdescLeft"> </td><td class="mdescRight">Sets the dataset transfer property list <code>status</code>. <br /></td></tr>
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<tr class="memitem:ga10a80b29444d933da1aa2003f46cf003" id="r_ga10a80b29444d933da1aa2003f46cf003"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga10a80b29444d933da1aa2003f46cf003">H5Pset_type_conv_cb</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dxpl_id, <a class="el" href="_h5_tpublic_8h.html#a8825c3dcb04c35a26f8709791b1fdb5e">H5T_conv_except_func_t</a> op, void *operate_data)</td></tr>
<tr class="memdesc:ga10a80b29444d933da1aa2003f46cf003"><td class="mdescLeft"> </td><td class="mdescRight">Sets user-defined datatype conversion callback function. <br /></td></tr>
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<tr class="memitem:ga2220ab75de470b6a6d5b1173d12aa0cf" id="r_ga2220ab75de470b6a6d5b1173d12aa0cf"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga2220ab75de470b6a6d5b1173d12aa0cf">H5Pset_vlen_mem_manager</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_m_mpublic_8h.html#a5fd832e4b7f42f93364153cb823e7ffa">H5MM_allocate_t</a> alloc_func, void *alloc_info, <a class="el" href="_h5_m_mpublic_8h.html#aa34c7616be59673cfc3d63fa7d960f25">H5MM_free_t</a> free_func, void *free_info)</td></tr>
<tr class="memdesc:ga2220ab75de470b6a6d5b1173d12aa0cf"><td class="mdescLeft"> </td><td class="mdescRight">Sets the memory manager for variable-length datatype allocation in <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread()</a> and <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim()</a> <br /></td></tr>
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<tr class="memitem:ga37ec8c3b3f1880ed6e1b300bc4ee9ed5" id="r_ga37ec8c3b3f1880ed6e1b300bc4ee9ed5"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga37ec8c3b3f1880ed6e1b300bc4ee9ed5">H5Pget_mpio_actual_chunk_opt_mode</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956">H5D_mpio_actual_chunk_opt_mode_t</a> *actual_chunk_opt_mode)</td></tr>
<tr class="memdesc:ga37ec8c3b3f1880ed6e1b300bc4ee9ed5"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves the type of chunk optimization that HDF5 actually performed on the last parallel I/O call (not necessarily the type requested) <br /></td></tr>
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<tr class="memitem:ga20efee54f7e69f5ececa0d3c752d3344" id="r_ga20efee54f7e69f5ececa0d3c752d3344"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga20efee54f7e69f5ececa0d3c752d3344">H5Pget_mpio_actual_io_mode</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0">H5D_mpio_actual_io_mode_t</a> *actual_io_mode)</td></tr>
<tr class="memdesc:ga20efee54f7e69f5ececa0d3c752d3344"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves the type of I/O that HDF5 actually performed on the last parallel I/O call (not necessarily the type requested) <br /></td></tr>
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<tr class="memitem:ga29707de7c06733295086daa3a2db4979" id="r_ga29707de7c06733295086daa3a2db4979"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga29707de7c06733295086daa3a2db4979">H5Pget_mpio_no_collective_cause</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, uint32_t *local_no_collective_cause, uint32_t *global_no_collective_cause)</td></tr>
<tr class="memdesc:ga29707de7c06733295086daa3a2db4979"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves local and global causes that broke collective I/O on the last parallel I/O call. <br /></td></tr>
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<tr class="memitem:gadd73dca2b824491cbe768028d7377b2f" id="r_gadd73dca2b824491cbe768028d7377b2f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gadd73dca2b824491cbe768028d7377b2f">H5Pset_dataset_io_hyperslab_selection</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, unsigned rank, <a class="el" href="_h5_spublic_8h.html#a10093bab27cc5720efdab3186993da0f">H5S_seloper_t</a> op, const <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> start[], const <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> stride[], const <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> count[], const <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> block[])</td></tr>
<tr class="memdesc:gadd73dca2b824491cbe768028d7377b2f"><td class="mdescLeft"> </td><td class="mdescRight">Sets a hyperslab file selection for a dataset I/O operation. <br /></td></tr>
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<tr class="memitem:ga7d4d11c9c273d5a5ce2d174d66e4fa10" id="r_ga7d4d11c9c273d5a5ce2d174d66e4fa10"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga7d4d11c9c273d5a5ce2d174d66e4fa10">H5Pset_selection_io</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a> selection_io_mode)</td></tr>
<tr class="memdesc:ga7d4d11c9c273d5a5ce2d174d66e4fa10"><td class="mdescLeft"> </td><td class="mdescRight">Sets the selection I/O mode. <br /></td></tr>
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<tr class="memitem:ga324f2407a698f376c9970331dd8c8d16" id="r_ga324f2407a698f376c9970331dd8c8d16"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga324f2407a698f376c9970331dd8c8d16">H5Pget_selection_io</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a> *selection_io_mode)</td></tr>
<tr class="memdesc:ga324f2407a698f376c9970331dd8c8d16"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves the selection I/O mode. <br /></td></tr>
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<tr class="memitem:gad6fa6bfa5956e8c0bd69c22bde65f84c" id="r_gad6fa6bfa5956e8c0bd69c22bde65f84c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gad6fa6bfa5956e8c0bd69c22bde65f84c">H5Pget_no_selection_io_cause</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, uint32_t *no_selection_io_cause)</td></tr>
<tr class="memdesc:gad6fa6bfa5956e8c0bd69c22bde65f84c"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call. <br /></td></tr>
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<tr class="memitem:ga252fe801869970c14a5e800a1ea7ab84" id="r_ga252fe801869970c14a5e800a1ea7ab84"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga252fe801869970c14a5e800a1ea7ab84">H5Pget_actual_selection_io_mode</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, uint32_t *actual_selection_io_mode)</td></tr>
<tr class="memdesc:ga252fe801869970c14a5e800a1ea7ab84"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves the type(s) of I/O that HDF5 actually performed on raw data during the last I/O call. <br /></td></tr>
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<tr class="memitem:ga6f65ca81d8a10015513a69fe76c5d542" id="r_ga6f65ca81d8a10015513a69fe76c5d542"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga6f65ca81d8a10015513a69fe76c5d542">H5Pset_modify_write_buf</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> modify_write_buf)</td></tr>
<tr class="memdesc:ga6f65ca81d8a10015513a69fe76c5d542"><td class="mdescLeft"> </td><td class="mdescRight">Allows the library to modify the contents of the write buffer. <br /></td></tr>
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<tr class="memitem:ga7a3e4d3f7b5c276873d00af3f92cdc22" id="r_ga7a3e4d3f7b5c276873d00af3f92cdc22"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga7a3e4d3f7b5c276873d00af3f92cdc22">H5Pget_modify_write_buf</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, <a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> *modify_write_buf)</td></tr>
<tr class="memdesc:ga7a3e4d3f7b5c276873d00af3f92cdc22"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves the "modify write buffer" property. <br /></td></tr>
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<h2 class="groupheader">Function Documentation</h2>
<a id="ga252fe801869970c14a5e800a1ea7ab84" name="ga252fe801869970c14a5e800a1ea7ab84"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga252fe801869970c14a5e800a1ea7ab84">◆ </a></span>H5Pget_actual_selection_io_mode()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_actual_selection_io_mode </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype">uint32_t *</td> <td class="paramname"><span class="paramname"><em>actual_selection_io_mode</em></span> )</td>
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<p>Retrieves the type(s) of I/O that HDF5 actually performed on raw data during the last I/O call. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">actual_selection_io_mode</td><td>A bitwise set value indicating the type(s) of I/O performed </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="section user"><dt>Motivation:</dt><dd>A user can request selection I/O to be performed via a data transfer property list (DXPL). This can be used to enable collective I/O with type conversion, or with custom VFDs that support vector or selection I/O. However, there are conditions that can cause HDF5 to forgo selection or vector I/O and perform legacy (scalar) I/O instead. This function allows the user to determine which type or types of I/O were actually performed.</dd></dl>
<p><a class="el" href="#ga252fe801869970c14a5e800a1ea7ab84" title="Retrieves the type(s) of I/O that HDF5 actually performed on raw data during the last I/O call.">H5Pget_actual_selection_io_mode()</a> allows the user to determine which type(s) of I/O were actually performed on raw data during the last I/O operation which used <code>plist_id</code>. This property is set after all I/O is completed; if I/O fails, it will not be set.</p>
<p><a class="el" href="#gad6fa6bfa5956e8c0bd69c22bde65f84c" title="Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call.">H5Pget_no_selection_io_cause()</a> can be used to determine the reason why selection or vector I/O was not performed.</p>
<p>Valid bitflags returned in <code>actual_selection_io_mode</code> are listed as follows.</p>
<ul>
<li><a class="el" href="_h5_ppublic_8h.html#a33a8e40afb222e4c7854ad9aaee140cb">H5D_SCALAR_IO</a> Scalar (or legacy MPIO) I/O was performed</li>
<li><a class="el" href="_h5_ppublic_8h.html#acde6ec06c2ba407bffd67335a82835ae">H5D_VECTOR_IO</a> Vector I/O was performed</li>
<li><a class="el" href="_h5_ppublic_8h.html#ad0795b084ee2432646a985523ff60ed1">H5D_SELECTION_IO</a> Selection I/O was performed</li>
</ul>
<p>0 or more of these can be present in <code>actual_selection_io_mode</code> in a bitwise fashion, since a single operation can trigger multiple instances of I/O, possibly with different types. A value of <code>0</code> indicates no raw data I/O was performed during the operation.</p>
<p>Be aware that this function will only include raw data I/O performed to/from disk as part of the last I/O operation. Any metadata I/O, including attribute and compact dataset I/O, is disregarded. It is also possible that data was cached in the dataset chunk cache or sieve buffer, which may prevent I/O from hitting the disk, and thereby prevent it from being counted by this function.</p>
<dl class="section since"><dt>Since</dt><dd>1.14.3 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga3f3df48ce44b6af7517654b23a37fa02">◆ </a></span>H5Pget_btree_ratios()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_btree_ratios </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype">double *</td> <td class="paramname"><span class="paramname"><em>left</em>, </span></td>
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<p>Gets B-tree split ratios for a dataset transfer property list. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">left</td><td>The B-tree split ratio for left-most nodes </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">middle</td><td>The B-tree split ratio for right-most nodes and lone nodes </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">right</td><td>The B-tree split ratio for all other nodes </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga3f3df48ce44b6af7517654b23a37fa02" title="Gets B-tree split ratios for a dataset transfer property list.">H5Pget_btree_ratios()</a> returns the B-tree split ratios for a dataset transfer property list.</p>
<p>The B-tree split ratios are returned through the non-NULL arguments <code>left</code>, <code>middle</code>, and <code>right</code>, as set by the <a class="el" href="#ga51d126d64fa766d44160a95057a2c733" title="Sets B-tree split ratios for a dataset transfer property list.">H5Pset_btree_ratios()</a> function.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga1278b9979cc833e77d699cc878c6dab4">◆ </a></span>H5Pget_buffer()</h2>
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<td class="memname">size_t H5Pget_buffer </td>
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<td class="paramtype">void **</td> <td class="paramname"><span class="paramname"><em>tconv</em>, </span></td>
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<p>Reads buffer settings. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Identifier for the dataset transfer property list </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">tconv</td><td>Address of the pointer to application-allocated type conversion buffer </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">bkg</td><td>Address of the pointer to application-allocated background buffer</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns buffer size, in bytes, if successful; otherwise 0 on failure.</dd></dl>
<p><a class="el" href="#ga1278b9979cc833e77d699cc878c6dab4" title="Reads buffer settings.">H5Pget_buffer()</a> reads values previously set with <a class="el" href="#ga777e8c171c9e462230a9fa40874b38ce" title="Sets type conversion and background buffers.">H5Pset_buffer()</a>.</p>
<dl class="section version"><dt>Version</dt><dd>1.6.0 The return type changed from <code>hsize_t</code> to <code>size_t</code>. </dd>
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1.4.0 The return type changed to <code>hsize_t</code>.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga865b05218e704578fe8db0c9dec07b25">◆ </a></span>H5Pget_data_transform()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#af629ed855824cf5955b54529adf78ad6">ssize_t</a> H5Pget_data_transform </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype">char *</td> <td class="paramname"><span class="paramname"><em>expression</em>, </span></td>
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<p>Retrieves a data transform expression. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Identifier of the property list or class </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">expression</td><td>Pointer to memory where the transform expression will be copied </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">size</td><td>Number of bytes of the transform expression to copy to</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Success: the size of the transform expression. Failure: a negative value.</dd></dl>
<p><a class="el" href="#ga865b05218e704578fe8db0c9dec07b25" title="Retrieves a data transform expression.">H5Pget_data_transform()</a> retrieves the data transform expression previously set in the dataset transfer property list <code>plist_id</code> by <a class="el" href="#gaa8c317b6164ae22a6ddae4131bbbcd22" title="Sets a data transform expression.">H5Pset_data_transform()</a>.</p>
<p><a class="el" href="#ga865b05218e704578fe8db0c9dec07b25" title="Retrieves a data transform expression.">H5Pget_data_transform()</a> can be used to both retrieve the transform expression and query its size.</p>
<p>If <code>expression</code> is non-NULL, up to <code>size</code> bytes of the data transform expression are written to the buffer. If <code>expression</code> is NULL, <code>size</code> is ignored, and the function does not write anything to the buffer. The function always returns the size of the data transform expression.</p>
<p>If 0 is returned for the size of the expression, no data transform expression exists for the property list.</p>
<p>If an error occurs, the buffer pointed to by <code>expression</code> is unchanged, and the function returns a negative value.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab66eca0259c33d575b4050eebfb6f2cd">◆ </a></span>H5Pget_dxpl_mpio()</h2>
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<td class="memname">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_dxpl_mpio </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_f_dmpi_8h.html#a99bc5a964089fea144e7056b004bcc16">H5FD_mpio_xfer_t</a> *</td> <td class="paramname"><span class="paramname"><em>xfer_mode</em></span> )</td>
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<p>Returns the data transfer mode. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">xfer_mode</td><td>Transfer mode </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gab66eca0259c33d575b4050eebfb6f2cd" title="Returns the data transfer mode.">H5Pget_dxpl_mpio()</a> queries the data transfer mode currently set in the data transfer property list <code>dxpl_id</code>.</p>
<p>Upon return, <code>xfer_mode</code> contains the data transfer mode, if it is non-null.</p>
<p><a class="el" href="#gab66eca0259c33d575b4050eebfb6f2cd" title="Returns the data transfer mode.">H5Pget_dxpl_mpio()</a> is not a collective function.</p>
<dl class="section since"><dt>Since</dt><dd>1.4.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gabc2b1e2af542ac15ee1613f4f89117e1">◆ </a></span>H5Pget_edc_check()</h2>
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<td class="memname"><a class="el" href="group___f_l_e_t_c_h_e_r32.html#ga5217bb01cd38dbfc4c5c8cad39c01a08">H5Z_EDC_t</a> H5Pget_edc_check </td>
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<p>Determines whether error-detection is enabled for dataset reads. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns <code>H5Z_ENABLE_EDC</code> or <code>H5Z_DISABLE_EDC</code> if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#gabc2b1e2af542ac15ee1613f4f89117e1" title="Determines whether error-detection is enabled for dataset reads.">H5Pget_edc_check()</a> queries the dataset transfer property list <code>plist</code> to determine whether error detection is enabled for data read operations.</p>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa55e7a6dd26a8df51b331febfeeb376b">◆ </a></span>H5Pget_hyper_vector_size()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_hyper_vector_size </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>fapl_id</em>, </span></td>
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<p>Retrieves number of I/O vectors to be read/written in hyperslab I/O. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">fapl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">size</td><td>Number of I/O vectors to accumulate in memory for I/O operations</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gaa55e7a6dd26a8df51b331febfeeb376b" title="Retrieves number of I/O vectors to be read/written in hyperslab I/O.">H5Pget_hyper_vector_size()</a> retrieves the number of I/O vectors to be accumulated in memory before being issued to the lower levels of the HDF5 library for reading or writing the actual data.</p>
<p>The number of I/O vectors set in the dataset transfer property list <code>fapl_id</code> is returned in <code>size</code>. Unless the default value is in use, <code>size</code> was previously set with a call to <a class="el" href="#gad8c1582c86e3316c70b0658b3b8e2071" title="Sets number of I/O vectors to be read/written in hyperslab I/O.">H5Pset_hyper_vector_size()</a>.</p>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7a3e4d3f7b5c276873d00af3f92cdc22">◆ </a></span>H5Pget_modify_write_buf()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_modify_write_buf </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> *</td> <td class="paramname"><span class="paramname"><em>modify_write_buf</em></span> )</td>
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<p>Retrieves the "modify write buffer" property. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">modify_write_buf</td><td>Whether the library can modify the contents of the write buffer</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga7a3e4d3f7b5c276873d00af3f92cdc22" title="Retrieves the "modify write buffer" property.">H5Pget_modify_write_buf()</a> gets the "modify write buffer" property from the dataset transfer property list <code>plist_id</code>. This property determines whether the library is allowed to modify the contents of write buffers passed to HDF5 API routines that are passed <code>plist_id</code>. The default value for modify_write_buf is false.</p>
<dl class="section since"><dt>Since</dt><dd>1.14.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga37ec8c3b3f1880ed6e1b300bc4ee9ed5">◆ </a></span>H5Pget_mpio_actual_chunk_opt_mode()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_mpio_actual_chunk_opt_mode </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956">H5D_mpio_actual_chunk_opt_mode_t</a> *</td> <td class="paramname"><span class="paramname"><em>actual_chunk_opt_mode</em></span> )</td>
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<p>Retrieves the type of chunk optimization that HDF5 actually performed on the last parallel I/O call (not necessarily the type requested) </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">actual_chunk_opt_mode</td><td>The type of chunk optimization performed by HDF5 </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="section user"><dt>Motivation:</dt><dd>A user can request collective I/O via a data transfer property list (DXPL) that has been suitably modified with <a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e" title="Sets data transfer mode.">H5Pset_dxpl_mpio()</a>. However, HDF5 will sometimes ignore this request and perform independent I/O instead. This property allows the user to see what kind of I/O HDF5 actually performed. Used in conjunction with <a class="el" href="#ga20efee54f7e69f5ececa0d3c752d3344" title="Retrieves the type of I/O that HDF5 actually performed on the last parallel I/O call (not necessarily...">H5Pget_mpio_actual_io_mode()</a>, this property allows the user to determine exactly what HDF5 did when attempting collective I/O.</dd></dl>
<p><a class="el" href="#ga37ec8c3b3f1880ed6e1b300bc4ee9ed5" title="Retrieves the type of chunk optimization that HDF5 actually performed on the last parallel I/O call (...">H5Pget_mpio_actual_chunk_opt_mode()</a> retrieves the type of chunk optimization performed when collective I/O was requested. This property is set before I/O takes place, and will be set even if I/O fails.</p>
<p>Valid values returned in <code>actual_chunk_opt_mode:</code> </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code hl_enumeration" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956">H5D_mpio_actual_chunk_opt_mode_t</a> {</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956aadaa21a8cd9cf87f1f2402713860d292">H5D_MPIO_NO_CHUNK_OPTIMIZATION</a> = 0,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956aad6c2490e65e0471e215051a6c389d17">H5D_MPIO_LINK_CHUNK</a>,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956af9b13cc1511b7c60e9cacbb208fae2bf">H5D_MPIO_MULTI_CHUNK</a></div>
<div class="line">} <a class="code hl_enumeration" href="_h5_ppublic_8h.html#a3d1f48e6c05b649980ddc5837e227956">H5D_mpio_actual_chunk_opt_mode_t</a>;</div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section since"><dt>Since</dt><dd>1.8.8 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga20efee54f7e69f5ececa0d3c752d3344">◆ </a></span>H5Pget_mpio_actual_io_mode()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_mpio_actual_io_mode </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0">H5D_mpio_actual_io_mode_t</a> *</td> <td class="paramname"><span class="paramname"><em>actual_io_mode</em></span> )</td>
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<p>Retrieves the type of I/O that HDF5 actually performed on the last parallel I/O call (not necessarily the type requested) </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">actual_io_mode</td><td>The type of I/O performed by this process </td></tr>
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</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="section user"><dt>Motivation:</dt><dd>A user can request collective I/O via a data transfer property list (DXPL) that has been suitably modified with <a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e" title="Sets data transfer mode.">H5Pset_dxpl_mpio()</a>. However, HDF5 will sometimes ignore this request and perform independent I/O instead. This property allows the user to see what kind of I/O HDF5 actually performed. Used in conjunction with <a class="el" href="#ga37ec8c3b3f1880ed6e1b300bc4ee9ed5" title="Retrieves the type of chunk optimization that HDF5 actually performed on the last parallel I/O call (...">H5Pget_mpio_actual_chunk_opt_mode()</a>, this property allows the user to determine exactly HDF5 did when attempting collective I/O.</dd></dl>
<p><a class="el" href="#ga20efee54f7e69f5ececa0d3c752d3344" title="Retrieves the type of I/O that HDF5 actually performed on the last parallel I/O call (not necessarily...">H5Pget_mpio_actual_io_mode()</a> retrieves the type of I/O performed on the selection of the current process. This property is set after all I/O is completed; if I/O fails, it will not be set.</p>
<p>Valid values returned in <code>actual_io_mode:</code> </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code hl_enumeration" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0">H5D_mpio_actual_io_mode_t</a> {</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0ac73c5dc05dabbb1f1180acbf8b05244d">H5D_MPIO_NO_COLLECTIVE</a> = 0x0,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0add50abb515a7fe1743a0afdd33381edf">H5D_MPIO_CHUNK_INDEPENDENT</a> = 0x1,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0a4fd05ee6bda93e2c84e26927e6db85d1">H5D_MPIO_CHUNK_COLLECTIVE</a> = 0x2,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0af0a554189ea82866198b190b81195163">H5D_MPIO_CHUNK_MIXED</a> = 0x1 | 0x2,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0ae597207e7aca6c346e3c10ae1efcb856">H5D_MPIO_CONTIGUOUS_COLLECTIVE</a> = 0x4</div>
<div class="line">} <a class="code hl_enumeration" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0">H5D_mpio_actual_io_mode_t</a>;</div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section attention"><dt>Attention</dt><dd>All processes do not need to have the same value. For example, if I/O is being performed using the multi chunk optimization scheme, one process's selection may include only chunks accessed collectively, while another may include chunks accessed independently. In this case, the first process will report <a class="el" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0a4fd05ee6bda93e2c84e26927e6db85d1">H5D_MPIO_CHUNK_COLLECTIVE</a> while the second will report <a class="el" href="_h5_ppublic_8h.html#ac8d48e1c028c095549922410dfd6ccd0add50abb515a7fe1743a0afdd33381edf">H5D_MPIO_CHUNK_INDEPENDENT</a>.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga29707de7c06733295086daa3a2db4979" title="Retrieves local and global causes that broke collective I/O on the last parallel I/O call.">H5Pget_mpio_no_collective_cause()</a>, <a class="el" href="#ga37ec8c3b3f1880ed6e1b300bc4ee9ed5" title="Retrieves the type of chunk optimization that HDF5 actually performed on the last parallel I/O call (...">H5Pget_mpio_actual_chunk_opt_mode()</a></dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.8.8 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga29707de7c06733295086daa3a2db4979">◆ </a></span>H5Pget_mpio_no_collective_cause()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_mpio_no_collective_cause </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype">uint32_t *</td> <td class="paramname"><span class="paramname"><em>local_no_collective_cause</em>, </span></td>
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<p>Retrieves local and global causes that broke collective I/O on the last parallel I/O call. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">local_no_collective_cause</td><td>An enumerated set value indicating the causes that prevented collective I/O in the local process </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">global_no_collective_cause</td><td>An enumerated set value indicating the causes across all processes that prevented collective I/O </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="section user"><dt>Motivation:</dt><dd>A user can request collective I/O via a data transfer property list (DXPL) that has been suitably modified with H5P_SET_DXPL_MPIO. However, there are conditions that can cause HDF5 to forgo collective I/O and perform independent I/O. Such causes can be different across the processes of a parallel application. This function allows the user to determine what caused the HDF5 library to skip collective I/O locally, that is in the local process, and globally, across all processes.</dd></dl>
<p><a class="el" href="#ga29707de7c06733295086daa3a2db4979" title="Retrieves local and global causes that broke collective I/O on the last parallel I/O call.">H5Pget_mpio_no_collective_cause()</a> serves two purposes. It can be used to determine whether collective I/O was used for the last preceding parallel I/O call. If collective I/O was not used, the function retrieves the local and global causes that broke collective I/O on that parallel I/O call. The properties retrieved by this function are set before I/O takes place and are retained even when I/O fails.</p>
<p>Valid values returned in <code>local_no_collective_cause</code> and <code>global_no_collective_cause</code> are as follows or, if there are multiple causes, a bitwise OR of the relevant causes; the numbers in the center column are the bitmask values: </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code hl_enumeration" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331a">H5D_mpio_no_collective_cause_t</a> {</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa0821dfeb60a8e6d73debaccc563d616a">H5D_MPIO_COLLECTIVE</a> = 0x00,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aaa079102c96a7e8bf9c7dcfcc21af3c6f">H5D_MPIO_SET_INDEPENDENT</a> = 0x01,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa00f738f0ec29f370a1831363f5410e7b">H5D_MPIO_DATATYPE_CONVERSION</a> = 0x02,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa901b05ea8d429a38b8bdb00210a3c265">H5D_MPIO_DATA_TRANSFORMS</a> = 0x04,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa9787b345b9cd5d6428e27a686a7ec76f">H5D_MPIO_MPI_OPT_TYPES_ENV_VAR_DISABLED</a> = 0x08,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa1aac491a2cb28a07176a1478a7cf5c5d">H5D_MPIO_NOT_SIMPLE_OR_SCALAR_DATASPACES</a> = 0x10,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa82ac7aecdc41065593069145abb6361e">H5D_MPIO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET</a> = 0x20,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa98d31452d729795e643df58e2d4b6428">H5D_MPIO_PARALLEL_FILTERED_WRITES_DISABLED</a> = 0x40,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aacc3ebc601d073db2450ff6d9ed16f04a">H5D_MPIO_ERROR_WHILE_CHECKING_COLLECTIVE_POSSIBLE</a> = 0x80,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa1ede0cf180b7772012dded55861d13fa">H5D_MPIO_NO_SELECTION_IO</a> = 0x100,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331aa52d9e6baa304ccf36d6793e7ca58880e">H5D_MPIO_NO_COLLECTIVE_MAX_CAUSE</a> = 0x200</div>
<div class="line">} <a class="code hl_enumeration" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331a">H5D_mpio_no_collective_cause_t</a>;</div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section attention"><dt>Attention</dt><dd>Each process determines whether it can perform collective I/O and broadcasts the result. Those results are combined to make a collective decision; collective I/O will be performed only if all processes can perform collective I/O.<br />
If collective I/O was not used, the causes that prevented it are reported by individual process by means of an enumerated set. The causes may differ among processes, so <a class="el" href="#ga29707de7c06733295086daa3a2db4979" title="Retrieves local and global causes that broke collective I/O on the last parallel I/O call.">H5Pget_mpio_no_collective_cause()</a> returns two property values. The first value is the one produced by the local process to report local causes. This local information is encoded in an enumeration, the <a class="el" href="_h5_ppublic_8h.html#aa6e23240b9aeac32d1491610b03b331a">H5D_mpio_no_collective_cause_t</a> described above, with all individual causes combined into a single enumeration value by means of a bitwise OR operation. The second value reports global causes; this global value is the result of a bitwise-OR operation across the values returned by all the processes.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.8.10 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gad6fa6bfa5956e8c0bd69c22bde65f84c">◆ </a></span>H5Pget_no_selection_io_cause()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_no_selection_io_cause </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<p>Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">no_selection_io_cause</td><td>A bitwise set value indicating the relevant causes that prevented selection I/O from being performed </td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="section user"><dt>Motivation:</dt><dd>A user can request selection I/O to be performed via a data transfer property list (DXPL). This can be used to enable collective I/O with type conversion, or with custom VFDs that support vector or selection I/O. However, there are conditions that can cause HDF5 to forgo selection or vector I/O and perform legacy (scalar) I/O instead.</dd></dl>
<p><a class="el" href="#gad6fa6bfa5956e8c0bd69c22bde65f84c" title="Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call.">H5Pget_no_selection_io_cause()</a> can be used to determine whether selection or vector I/O was applied for the last preceding I/O call. If selection or vector I/O was not used, this function retrieves the cause(s) that prevent selection or vector I/O to be performed on that I/O call. The properties retrieved by this function are set before I/O takes place and are retained even when I/O fails.</p>
<p>If a selection I/O request falls back to vector I/O, that is not considered "breaking" selection I/O by this function, since vector I/O still passes all information to the file driver in a single callback.</p>
<p>Valid values returned in <code>no_selection_io_cause</code> are listed as follows. If there are multiple causes, it is a bitwise OR of the relevant causes.</p>
<ul>
<li><a class="el" href="_h5_ppublic_8h.html#af95c664a7d81d6ba2afada57dbd68098">H5D_SEL_IO_DISABLE_BY_API</a> Selection I/O was not performed because the feature was disabled by the API</li>
<li><a class="el" href="_h5_ppublic_8h.html#a151ba957f8a2b49c7365214621dc73ae">H5D_SEL_IO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET</a> Selection I/O was not performed because the dataset was neither contiguous nor chunked</li>
<li><a class="el" href="_h5_ppublic_8h.html#a6dc7f66df0be55845aadff104e828e31">H5D_SEL_IO_CONTIGUOUS_SIEVE_BUFFER</a> Selection I/O was not performed because of sieve buffer for contiguous dataset</li>
<li><a class="el" href="_h5_ppublic_8h.html#ad926b5089244351e4efd11c23e288c61">H5D_SEL_IO_NO_VECTOR_OR_SELECTION_IO_CB</a> Selection I/O was not performed because the VFD does not have vector or selection I/O callback</li>
<li><a class="el" href="_h5_ppublic_8h.html#adbbb3738f3a693a30e325048f530f2a7">H5D_SEL_IO_PAGE_BUFFER</a> Selection I/O was not performed because of page buffer</li>
<li><a class="el" href="_h5_ppublic_8h.html#a6186546550fa3150f57ded76c05264b2">H5D_SEL_IO_DATASET_FILTER</a> Selection I/O was not performed because of dataset filters</li>
<li><a class="el" href="_h5_ppublic_8h.html#aa78649650e450cb310c768b6e5333b4e">H5D_SEL_IO_CHUNK_CACHE</a> Selection I/O was not performed because of chunk cache</li>
<li><a class="el" href="_h5_ppublic_8h.html#a367e3e52a64124928a24dd3664f94f2d">H5D_SEL_IO_TCONV_BUF_TOO_SMALL</a> Selection I/O was not performed because the type conversion buffer is too small</li>
<li><a class="el" href="_h5_ppublic_8h.html#a70f610a09605a2d228d3cff36d93f3ab">H5D_SEL_IO_BKG_BUF_TOO_SMALL</a> Selection I/O was not performed because the type conversion background buffer is too small</li>
<li><a class="el" href="_h5_ppublic_8h.html#af6d12803003dfbaf21ceaad70decd098">H5D_SEL_IO_DEFAULT_OFF</a> Selection I/O was not performed because the selection I/O mode is DEFAULT and the library chose it to be off for this case</li>
</ul>
<dl class="section since"><dt>Since</dt><dd>1.14.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gacca1a094d70c3b2277175145142fda10">◆ </a></span>H5Pget_preserve()</h2>
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<td class="memname">int H5Pget_preserve </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em></span></td><td>)</td>
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<p>Checks status of the dataset transfer property list (<b>DEPRECATED</b>) </p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000068">Deprecated</a></b></dt><dd></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Identifier for the dataset transfer property list</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns 1 or 0 if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#gacca1a094d70c3b2277175145142fda10" title="Checks status of the dataset transfer property list (DEPRECATED)">H5Pget_preserve()</a> checks the status of the dataset transfer property list.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0</dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.6.0 The flag parameter was changed from INTEGER to LOGICAL to better match the C API. (Fortran 90) </dd>
<dd>
1.8.2 Deprecated. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga324f2407a698f376c9970331dd8c8d16">◆ </a></span>H5Pget_selection_io()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_selection_io </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a> *</td> <td class="paramname"><span class="paramname"><em>selection_io_mode</em></span> )</td>
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<p>Retrieves the selection I/O mode. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">selection_io_mode</td><td>The selection I/O mode</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga324f2407a698f376c9970331dd8c8d16" title="Retrieves the selection I/O mode.">H5Pget_selection_io()</a> queries the selection I/O mode set in in the dataset transfer property list <code>plist_id</code>.</p>
<p>Values returned in <code>selection_io_mode:</code> </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code hl_enumeration" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a> {</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795a69dfe00660babb8a8f8abb29ba5210e7">H5D_SELECTION_IO_MODE_DEFAULT</a> = 0,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795a45fa23a7883df7239cfe4f36a97b99d8">H5D_SELECTION_IO_MODE_OFF</a>,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795ad38fb01652ffe7ef8601455483ab809e">H5D_SELECTION_IO_MODE_ON</a></div>
<div class="line">} <a class="code hl_enumeration" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a>;</div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section note"><dt>Note</dt><dd>The library may not perform selection I/O as it asks for if the layout callback determines that it is not feasible to do so. Please refer to <a class="el" href="#gad6fa6bfa5956e8c0bd69c22bde65f84c" title="Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call.">H5Pget_no_selection_io_cause()</a> for details.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.14.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gae8c8557d303fa914b569da0182284e89">◆ </a></span>H5Pget_type_conv_cb()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_type_conv_cb </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_tpublic_8h.html#a8825c3dcb04c35a26f8709791b1fdb5e">H5T_conv_except_func_t</a> *</td> <td class="paramname"><span class="paramname"><em>op</em>, </span></td>
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<td class="paramtype">void **</td> <td class="paramname"><span class="paramname"><em>operate_data</em></span> )</td>
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<p>Gets user-defined datatype conversion callback function. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">op</td><td>User-defined type conversion callback function </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">operate_data</td><td>User-defined input data for the callback function</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gae8c8557d303fa914b569da0182284e89" title="Gets user-defined datatype conversion callback function.">H5Pget_type_conv_cb()</a> gets the user-defined datatype conversion callback function <code>op</code> in the dataset transfer property list <code>dxpl_id</code>.</p>
<p>The parameter <code>operate_data</code> is a pointer to user-defined input data for the callback function.</p>
<p>The callback function <code>op</code> defines the actions an application is to take when there is an exception during datatype conversion.</p>
<p>Please refer to the function <a class="el" href="#ga10a80b29444d933da1aa2003f46cf003" title="Sets user-defined datatype conversion callback function.">H5Pset_type_conv_cb()</a> for more details.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9de8cad8b5664a956d965fd9414c376e">◆ </a></span>H5Pget_vlen_mem_manager()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pget_vlen_mem_manager </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_m_mpublic_8h.html#a5fd832e4b7f42f93364153cb823e7ffa">H5MM_allocate_t</a> *</td> <td class="paramname"><span class="paramname"><em>alloc_func</em>, </span></td>
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<td class="paramtype">void **</td> <td class="paramname"><span class="paramname"><em>alloc_info</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_m_mpublic_8h.html#aa34c7616be59673cfc3d63fa7d960f25">H5MM_free_t</a> *</td> <td class="paramname"><span class="paramname"><em>free_func</em>, </span></td>
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<td class="paramtype">void **</td> <td class="paramname"><span class="paramname"><em>free_info</em></span> )</td>
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<p>Gets the memory manager for variable-length datatype allocation in <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread()</a> and <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim()</a> </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Identifier for the dataset transfer property list </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">alloc_func</td><td>User's allocate routine, or NULL for system malloc </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">alloc_info</td><td>Extra parameter for user's allocation routine. Contents are ignored if preceding parameter is NULL</td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">free_func</td><td>User's free routine, or NULL for system free</td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">free_info</td><td>Extra parameter for user's free routine. Contents are ignored if preceding parameter is NULL</td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga9de8cad8b5664a956d965fd9414c376e" title="Gets the memory manager for variable-length datatype allocation in H5Dread() and H5Dvlen_reclaim()">H5Pget_vlen_mem_manager()</a> is the companion function to <a class="el" href="#ga2220ab75de470b6a6d5b1173d12aa0cf" title="Sets the memory manager for variable-length datatype allocation in H5Dread() and H5Dvlen_reclaim()">H5Pset_vlen_mem_manager()</a>, returning the parameters set by that function.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga51d126d64fa766d44160a95057a2c733">◆ </a></span>H5Pset_btree_ratios()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_btree_ratios </td>
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<td class="paramtype">double</td> <td class="paramname"><span class="paramname"><em>left</em>, </span></td>
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<p>Sets B-tree split ratios for a dataset transfer property list. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>The dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">left</td><td>The B-tree split ratio for left-most nodes </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">middle</td><td>The B-tree split ratio for all other nodes </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">right</td><td>The B-tree split ratio for right-most nodes and lone nodes</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga51d126d64fa766d44160a95057a2c733" title="Sets B-tree split ratios for a dataset transfer property list.">H5Pset_btree_ratios()</a> sets the B-tree split ratios for a dataset transfer property list. The split ratios determine what percent of children go in the first node when a node splits.</p>
<p>The ratio <code>left</code> is used when the splitting node is the left-most node at its level in the tree; the ratio <code>right</code> is used when the splitting node is the right-most node at its level; and the ratio <code>middle</code> is used for all other cases.</p>
<p>A node that is the only node at its level in the tree uses the ratio <code>right</code> when it splits.</p>
<p>All ratios are real numbers between 0 and 1, inclusive.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga777e8c171c9e462230a9fa40874b38ce">◆ </a></span>H5Pset_buffer()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_buffer </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype">size_t</td> <td class="paramname"><span class="paramname"><em>size</em>, </span></td>
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<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>tconv</em>, </span></td>
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<p>Sets type conversion and background buffers. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">size</td><td>Size, in bytes, of the type conversion and background buffers </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">tconv</td><td>Pointer to application-allocated type conversion buffer </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">bkg</td><td>Pointer to application-allocated background buffer </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>Given a dataset transfer property list, <a class="el" href="#ga777e8c171c9e462230a9fa40874b38ce" title="Sets type conversion and background buffers.">H5Pset_buffer()</a> sets the maximum size for the type conversion buffer and background buffer and optionally supplies pointers to application-allocated buffers. If the buffer size is smaller than the entire amount of data being transferred between the application and the file, and a type conversion buffer or background buffer is required, then strip mining will be used.</p>
<p>Note that there are minimum size requirements for the buffer. Strip mining can only break the data up along the first dimension, so the buffer must be large enough to accommodate a complete slice that encompasses all of the remaining dimensions. For example, when strip mining a <code>100x200x300</code> hyperslab of a simple data space, the buffer must be large enough to hold <code>1x200x300</code> data elements. When strip mining a <code>100x200x300x150</code> hyperslab of a simple data space, the buffer must be large enough to hold <code>1x200x300x150</code> data elements.</p>
<p>If <code>tconv</code> and/or <code>bkg</code> are null pointers, then buffers will be allocated and freed during the data transfer.</p>
<p>The default value for the maximum buffer is 1 MiB.</p>
<dl class="section version"><dt>Version</dt><dd>1.6.0 The <code>size</code> parameter has changed from type hsize_t to <code>size_t</code>. </dd>
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1.4.0 The <code>size</code> parameter has changed to type hsize_t.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa8c317b6164ae22a6ddae4131bbbcd22">◆ </a></span>H5Pset_data_transform()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_data_transform </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<p>Sets a data transform expression. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">expression</td><td>Pointer to the null-terminated data transform expression </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gaa8c317b6164ae22a6ddae4131bbbcd22" title="Sets a data transform expression.">H5Pset_data_transform()</a> sets the data transform to be used for reading and writing data. This function operates on the dataset transfer property list <code>plist_id</code>.</p>
<p>The <code>expression</code> parameter is a string containing an algebraic expression, such as <code>(5/9.0)*(x-32)</code> or <code>x*(x-5)</code>. When a dataset is read or written with this property list, the transform expression is applied with the <code>x</code> being replaced by the values in the dataset. When reading data, the values in the file are not changed and the transformed data is returned to the user.</p>
<p>Data transforms can only be applied to integer or floating-point datasets. Order of operations is obeyed and the only supported operations are +, -, *, and /. Parentheses can be nested arbitrarily and can be used to change precedence. When writing data back to the dataset, the transformed data is written to the file and there is no way to recover the original values to which the transform was applied.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gadd73dca2b824491cbe768028d7377b2f">◆ </a></span>H5Pset_dataset_io_hyperslab_selection()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_dataset_io_hyperslab_selection </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_spublic_8h.html#a10093bab27cc5720efdab3186993da0f">H5S_seloper_t</a></td> <td class="paramname"><span class="paramname"><em>op</em>, </span></td>
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<p>Sets a hyperslab file selection for a dataset I/O operation. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">rank</td><td>Number of dimensions of selection </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">op</td><td>Operation to perform on current selection </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">start</td><td>Offset of start of hyperslab </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">stride</td><td>Hyperslab stride </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">count</td><td>Number of blocks included in hyperslab </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">block</td><td>Size of block in hyperslab</td></tr>
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</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gadd73dca2b824491cbe768028d7377b2f" title="Sets a hyperslab file selection for a dataset I/O operation.">H5Pset_dataset_io_hyperslab_selection()</a> is designed to be used in conjunction with using <a class="el" href="_h5_spublic_8h.html#afee156939b96525e1b0026856f2288cf">H5S_PLIST</a> for the file dataspace ID when making a call to <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread()</a> or <a class="el" href="group___h5_d.html#ga98f44998b67587662af8b0d8a0a75906" title="Writes raw data from a buffer to a dataset.">H5Dwrite()</a>. When used with <a class="el" href="_h5_spublic_8h.html#afee156939b96525e1b0026856f2288cf">H5S_PLIST</a>, the selection created by one or more calls to this routine is used for determining which dataset elements to access.</p>
<p><code>rank</code> is the dimensionality of the selection and determines the size of the <code>start</code>, <code>stride</code>, <code>count</code>, and <code>block</code> arrays. <code>rank</code> must be between 1 and <a class="el" href="_h5_spublic_8h.html#a265cb2343f05cb71831119c90de31a8f">H5S_MAX_RANK</a>, inclusive.</p>
<p>The <code>op</code>, <code>start</code>, <code>stride</code>, <code>count</code>, and <code>block</code> parameters behave identically to their behavior for <a class="el" href="group___h5_s.html#ga6adfdf1b95dc108a65bf66e97d38536d" title="Selects a hyperslab region to add to the current selected region.">H5Sselect_hyperslab()</a>, please see the documentation for that routine for details about their use.</p>
<dl class="section since"><dt>Since</dt><dd>1.14.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga001a22b64f60b815abf5de8b4776f09e">◆ </a></span>H5Pset_dxpl_mpio()</h2>
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<td class="memname">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_dxpl_mpio </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_f_dmpi_8h.html#a99bc5a964089fea144e7056b004bcc16">H5FD_mpio_xfer_t</a></td> <td class="paramname"><span class="paramname"><em>xfer_mode</em></span> )</td>
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<p>Sets data transfer mode. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">xfer_mode</td><td>Transfer mode </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e" title="Sets data transfer mode.">H5Pset_dxpl_mpio()</a> sets the data transfer property list <code>dxpl_id</code> to use transfer mode <code>xfer_mode</code>. The property list can then be used to control the I/O transfer mode during data I/O operations.</p>
<p>Valid transfer modes are <a class="el" href="_h5_f_dmpi_8h.html#a99bc5a964089fea144e7056b004bcc16a6c67820a8798cd75a6f0ebbb44e9a2af">H5FD_MPIO_INDEPENDENT</a> (default) and <a class="el" href="_h5_f_dmpi_8h.html#a99bc5a964089fea144e7056b004bcc16a75d4dc80546ad3c16d2d7647ab267fab">H5FD_MPIO_COLLECTIVE</a>.</p>
<dl class="section since"><dt>Since</dt><dd>1.4.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gadc911ad42f580ce2df327383188ed4ba">◆ </a></span>H5Pset_dxpl_mpio_chunk_opt()</h2>
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<td class="memname">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_dxpl_mpio_chunk_opt </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_f_dmpi_8h.html#aad0ca234af678f0f0976d810ee2bf246">H5FD_mpio_chunk_opt_t</a></td> <td class="paramname"><span class="paramname"><em>opt_mode</em></span> )</td>
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<p>Sets a flag specifying linked-chunk I/O or multi-chunk I/O. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">opt_mode</td><td>Transfer mode </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gadc911ad42f580ce2df327383188ed4ba" title="Sets a flag specifying linked-chunk I/O or multi-chunk I/O.">H5Pset_dxpl_mpio_chunk_opt()</a> specifies whether I/O is to be performed as linked-chunk I/O or as multi-chunk I/O. This function overrides the HDF5 library's internal algorithm for determining which mechanism to use.</p>
<p>When an application uses collective I/O with chunked storage, the HDF5 library normally uses an internal algorithm to determine whether that I/O activity should be conducted as one linked-chunk I/O or as multi-chunk I/O. <a class="el" href="#gadc911ad42f580ce2df327383188ed4ba" title="Sets a flag specifying linked-chunk I/O or multi-chunk I/O.">H5Pset_dxpl_mpio_chunk_opt()</a> is provided so that an application can override the library's algorithm in circumstances where the library might lack the information needed to make an optimal decision.</p>
<p><a class="el" href="#gadc911ad42f580ce2df327383188ed4ba" title="Sets a flag specifying linked-chunk I/O or multi-chunk I/O.">H5Pset_dxpl_mpio_chunk_opt()</a> works by setting one of the following flags in the parameter <code>opt_mode:</code> </p><ul>
<li><a class="el" href="_h5_f_dmpi_8h.html#aad0ca234af678f0f0976d810ee2bf246aff7d0c0869457b488871b64b3c173057">H5FD_MPIO_CHUNK_ONE_IO</a> - Do one-link chunked I/O</li>
<li><a class="el" href="_h5_f_dmpi_8h.html#aad0ca234af678f0f0976d810ee2bf246aa4c75c4d5abf261d58099c53e63e3b19">H5FD_MPIO_CHUNK_MULTI_IO</a> - Do multi-chunked I/O</li>
</ul>
<p>This function works by setting a corresponding property in the dataset transfer property list <code>dxpl_id</code>.</p>
<p>The library performs I/O in the specified manner unless it determines that the low-level MPI IO package does not support the requested behavior; in such cases, the HDF5 library will internally use independent I/O.</p>
<p>Use of this function is optional.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaaf5f3432a7d1a1c3f8e3eee6a3dc9810">◆ </a></span>H5Pset_dxpl_mpio_chunk_opt_num()</h2>
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<td class="memname">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_dxpl_mpio_chunk_opt_num </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype">unsigned</td> <td class="paramname"><span class="paramname"><em>num_chunk_per_proc</em></span> )</td>
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<p>Sets a numeric threshold for linked-chunk I/O. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">num_chunk_per_proc</td><td></td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gaaf5f3432a7d1a1c3f8e3eee6a3dc9810" title="Sets a numeric threshold for linked-chunk I/O.">H5Pset_dxpl_mpio_chunk_opt_num()</a> sets a numeric threshold for the use of linked-chunk I/O.</p>
<p>The library will calculate the average number of chunks selected by each process when doing collective access with chunked storage. If the number is greater than the threshold set in <code>num_chunk_per_proc</code>, the library will use linked-chunk I/O; otherwise, a separate I/O process will be invoked for each chunk (multi-chunk I/O).</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0b53b19c37bda96d3578ce38b3858ea3">◆ </a></span>H5Pset_dxpl_mpio_chunk_opt_ratio()</h2>
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<td class="memname">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_dxpl_mpio_chunk_opt_ratio </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype">unsigned</td> <td class="paramname"><span class="paramname"><em>percent_num_proc_per_chunk</em></span> )</td>
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<p>Sets a ratio threshold for collective I/O. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">percent_num_proc_per_chunk</td><td></td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga0b53b19c37bda96d3578ce38b3858ea3" title="Sets a ratio threshold for collective I/O.">H5Pset_dxpl_mpio_chunk_opt_ratio()</a> sets a threshold for the use of collective I/O based on the ratio of processes with collective access to a dataset with chunked storage. The decision whether to use collective I/O is made on a per-chunk basis.</p>
<p>The library will calculate the percentage of the total number of processes, the ratio, that hold selections in each chunk. If that percentage is greater than the threshold set in <code>percent_proc_per_chunk</code>, the library will do collective I/O for this chunk; otherwise, independent I/O will be done for the chunk.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gacb30d14d1791ec7ff9ee73aa148a51a3">◆ </a></span>H5Pset_dxpl_mpio_collective_opt()</h2>
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<td class="memname">H5_DLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_dxpl_mpio_collective_opt </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_f_dmpi_8h.html#afaf7d5667632176e8daca47549e29fb8">H5FD_mpio_collective_opt_t</a></td> <td class="paramname"><span class="paramname"><em>opt_mode</em></span> )</td>
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<p>Sets low-level data transfer mode. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">opt_mode</td><td>Transfer mode </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gacb30d14d1791ec7ff9ee73aa148a51a3" title="Sets low-level data transfer mode.">H5Pset_dxpl_mpio_collective_opt()</a> sets the data transfer property list <code>dxpl_id</code> to use transfer mode <code>opt_mode</code> when performing I/O. This allows the application to specify collective I/O at the HDF5 interface level (with the <a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e" title="Sets data transfer mode.">H5Pset_dxpl_mpio()</a> API routine), while controlling whether the actual I/O is performed collectively (e.g., via MPI_File_write_at_all) or independently (e.g., via MPI_File_write_at). If the collectivity setting at the HDF5 interface level (set via <a class="el" href="#ga001a22b64f60b815abf5de8b4776f09e" title="Sets data transfer mode.">H5Pset_dxpl_mpio()</a>) is not set to H5FD_MPIO_COLLECTIVE, this setting will be ignored.</p>
<p>Valid transfer modes are <a class="el" href="_h5_f_dmpi_8h.html#afaf7d5667632176e8daca47549e29fb8a3816f1011586f6f6f57ce6c2a6c2fcbe">H5FD_MPIO_COLLECTIVE_IO</a> (default) and <a class="el" href="_h5_f_dmpi_8h.html#afaf7d5667632176e8daca47549e29fb8aaacd91139f703159fde84fb5f7778886">H5FD_MPIO_INDIVIDUAL_IO</a>.</p>
<dl class="section since"><dt>Since</dt><dd>1.4.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0d95dfa506784acc9aed850c99713609">◆ </a></span>H5Pset_edc_check()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_edc_check </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="group___f_l_e_t_c_h_e_r32.html#ga5217bb01cd38dbfc4c5c8cad39c01a08">H5Z_EDC_t</a></td> <td class="paramname"><span class="paramname"><em>check</em></span> )</td>
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<p>Sets the dataset transfer property list to enable or disable error detection when reading data. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">check</td><td>Specifies whether error checking is enabled or disabled for dataset read operations </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga0d95dfa506784acc9aed850c99713609" title="Sets the dataset transfer property list to enable or disable error detection when reading data.">H5Pset_edc_check()</a> sets the dataset transfer property list <code>plist</code> to enable or disable error detection when reading data.</p>
<p>Whether error detection is enabled or disabled is specified in the <code>check</code> parameter. Valid values are <a class="el" href="group___f_l_e_t_c_h_e_r32.html#gga5217bb01cd38dbfc4c5c8cad39c01a08ae1594c4d9c282b08461e6c1dd880dc2a">H5Z_ENABLE_EDC</a> (default) and <a class="el" href="group___f_l_e_t_c_h_e_r32.html#gga5217bb01cd38dbfc4c5c8cad39c01a08a0c21397694cd7ac1573b19b81c581c32">H5Z_DISABLE_EDC</a>.</p>
<dl class="section note"><dt>Note</dt><dd>The initial error detection implementation, Fletcher32 checksum, supports error detection for chunked datasets only.</dd></dl>
<dl class="section attention"><dt>Attention</dt><dd>The Fletcher32 EDC checksum filter, set with <a class="el" href="group___o_c_p_l.html#ga8bc81abfbd0393b0a46e121f817a3f81" title="Sets up use of the Fletcher32 checksum filter.">H5Pset_fletcher32()</a>, was added in HDF5 Release 1.6.0. In the original implementation, however, the checksum value was calculated incorrectly on little-endian systems. The error was fixed in HDF5 Release 1.6.3.<br />
As a result of this fix, an HDF5 library of Release 1.6.0 through Release 1.6.2 cannot read a dataset created or written with Release 1.6.3 or later if the dataset was created with the checksum filter and the filter is enabled in the reading library. (Libraries of Release 1.6.3 and later understand the earlier error and compensate appropriately.)<br />
<b>Work-around:</b> An HDF5 library of Release 1.6.2 or earlier will be able to read a dataset created or written with the checksum filter by an HDF5 library of Release 1.6.3 or later if the checksum filter is disabled for the read operation. This can be accomplished via an <a class="el" href="#ga0d95dfa506784acc9aed850c99713609" title="Sets the dataset transfer property list to enable or disable error detection when reading data.">H5Pset_edc_check()</a> call with the value <a class="el" href="group___f_l_e_t_c_h_e_r32.html#gga5217bb01cd38dbfc4c5c8cad39c01a08a0c21397694cd7ac1573b19b81c581c32">H5Z_DISABLE_EDC</a> in the second parameter. This has the obvious drawback that the application will be unable to verify the checksum, but the data does remain accessible.</dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.6.3 Error in checksum calculation on little-endian systems corrected in this release. </dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga1890e730c34efa20cd6a5d1d2a0e8caa">◆ </a></span>H5Pset_filter_callback()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_filter_callback </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_zpublic_8h.html#a3b2331dc3dab96f25a94b6dd7675507c">H5Z_filter_func_t</a></td> <td class="paramname"><span class="paramname"><em>func</em>, </span></td>
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<p>Sets user-defined filter callback function. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">func</td><td>User-defined filter callback function </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">op_data</td><td>User-defined input data for the callback function </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga1890e730c34efa20cd6a5d1d2a0e8caa" title="Sets user-defined filter callback function.">H5Pset_filter_callback()</a> sets the user-defined filter callback function <code>func</code> in the dataset transfer property list <code>plist_id</code>.</p>
<p>The parameter <code>op_data</code> is a pointer to user-defined input data for the callback function and will be passed through to the callback function.</p>
<p>The callback function <code>func</code> defines the actions an application is to take when a filter fails. The function prototype is as follows: </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <a class="code hl_enumeration" href="_h5_zpublic_8h.html#a868d4c5fa073332c69380d746351f078">H5Z_cb_return_t</a> (*<a class="code hl_typedef" href="_h5_zpublic_8h.html#a3b2331dc3dab96f25a94b6dd7675507c">H5Z_filter_func_t</a>)(<a class="code hl_typedef" href="_h5_zpublic_8h.html#afae8461c70d47e63be2163af23362237">H5Z_filter_t</a> filter, <span class="keywordtype">void</span> *buf, <span class="keywordtype">size_t</span> buf_size, <span class="keywordtype">void</span> *op_data);</div>
</div><!-- fragment --><p> where <code>filter</code> indicates which filter has failed, <code>buf</code> and <code>buf_size</code> are used to pass in the failed data, and op_data is the required input data for this callback function.</p>
<p>Valid callback function return values are <a class="el" href="_h5_zpublic_8h.html#a868d4c5fa073332c69380d746351f078a16fc9318a06ef5aa1e9d26b543c0f5c0">H5Z_CB_FAIL</a> and <a class="el" href="_h5_zpublic_8h.html#a868d4c5fa073332c69380d746351f078a6173e5f243ec2abbb36748fd82e8573f">H5Z_CB_CONT</a>.</p>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gad8c1582c86e3316c70b0658b3b8e2071">◆ </a></span>H5Pset_hyper_vector_size()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_hyper_vector_size </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<p>Sets number of I/O vectors to be read/written in hyperslab I/O. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">size</td><td>Number of I/O vectors to accumulate in memory for I/O operations<br />
Must be greater than 1 (one)<br />
Default value: 1024 </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gad8c1582c86e3316c70b0658b3b8e2071" title="Sets number of I/O vectors to be read/written in hyperslab I/O.">H5Pset_hyper_vector_size()</a> sets the number of I/O vectors to be accumulated in memory before being issued to the lower levels of the HDF5 library for reading or writing the actual data.</p>
<p>The I/O vectors are hyperslab offset and length pairs and are generated during hyperslab I/O.</p>
<p>The number of I/O vectors is passed in <code>size</code> to be set in the dataset transfer property list <code>plist_id</code>. <code>size</code> must be greater than 1 (one).</p>
<p><a class="el" href="#gad8c1582c86e3316c70b0658b3b8e2071" title="Sets number of I/O vectors to be read/written in hyperslab I/O.">H5Pset_hyper_vector_size()</a> is an I/O optimization function; increasing vector_size should provide better performance, but the library will use more memory during hyperslab I/O. The default value of <code>size</code> is 1024.</p>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga6f65ca81d8a10015513a69fe76c5d542">◆ </a></span>H5Pset_modify_write_buf()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_modify_write_buf </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a></td> <td class="paramname"><span class="paramname"><em>modify_write_buf</em></span> )</td>
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<p>Allows the library to modify the contents of the write buffer. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">modify_write_buf</td><td>Whether the library can modify the contents of the write buffer</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga6f65ca81d8a10015513a69fe76c5d542" title="Allows the library to modify the contents of the write buffer.">H5Pset_modify_write_buf()</a> sets whether the library is allowed to modify the contents of write buffers passed to HDF5 API routines that are passed the dataset transfer property list <code>plist_id</code>. The default value for modify_write_buf is false.</p>
<p>This function can be used to allow the library to perform in-place type conversion on write operations to save memory space. After making an API call with this parameter set to true, the contents of the write buffer are undefined.</p>
<dl class="section note"><dt>Note</dt><dd>When modify_write_buf is set to true the library may violate the const qualifier on the API parameter for the write buffer.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.14.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gae8b87209ba6a3943eb614b6dfe55e588">◆ </a></span>H5Pset_preserve()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_preserve </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a></td> <td class="paramname"><span class="paramname"><em>status</em></span> )</td>
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<p>Sets the dataset transfer property list <code>status</code>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">status</td><td>Status toggle of the dataset transfer property list </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000069">Deprecated</a></b></dt><dd>This function is deprecated as it no longer has any effect; compound datatype field preservation is now core functionality in the HDF5 library.</dd></dl>
<p><a class="el" href="#gae8b87209ba6a3943eb614b6dfe55e588" title="Sets the dataset transfer property list status.">H5Pset_preserve()</a> sets the dataset transfer property list status to <code>1</code> or <code>0</code>.</p>
<p>When reading or writing compound datatypes and the destination is partially initialized and the read/write is intended to initialize the other members, one must set this property to <code>1</code>. Otherwise the I/O pipeline treats the destination datapoints as completely uninitialized.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0</dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.8.2 Deprecated. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7d4d11c9c273d5a5ce2d174d66e4fa10">◆ </a></span>H5Pset_selection_io()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_selection_io </td>
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<td class="paramtype"><a class="el" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a></td> <td class="paramname"><span class="paramname"><em>selection_io_mode</em></span> )</td>
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<p>Sets the selection I/O mode. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">selection_io_mode</td><td>The selection I/O mode to be set</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga7d4d11c9c273d5a5ce2d174d66e4fa10" title="Sets the selection I/O mode.">H5Pset_selection_io()</a> sets the selection I/O mode <code>selection_io_mode</code> in the dataset transfer property list <code>plist_id</code>.</p>
<p>This can be used to enable collective I/O with type conversion, or with custom VFDs that support vector or selection I/O.</p>
<p>Values that can be set in <code>selection_io_mode:</code> </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code hl_enumeration" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a> {</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795a69dfe00660babb8a8f8abb29ba5210e7">H5D_SELECTION_IO_MODE_DEFAULT</a> = 0,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795a45fa23a7883df7239cfe4f36a97b99d8">H5D_SELECTION_IO_MODE_OFF</a>,</div>
<div class="line"> <a class="code hl_enumvalue" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795ad38fb01652ffe7ef8601455483ab809e">H5D_SELECTION_IO_MODE_ON</a></div>
<div class="line">} <a class="code hl_enumeration" href="_h5_ppublic_8h.html#a830b3ed265553177c07dd644f83ea795">H5D_selection_io_mode_t</a>;</div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section note"><dt>Note</dt><dd>The library may not perform selection I/O as it asks for if the layout callback determines that it is not feasible to do so. Please refer to <a class="el" href="#gad6fa6bfa5956e8c0bd69c22bde65f84c" title="Retrieves the cause for not performing selection or vector I/O on the last parallel I/O call.">H5Pget_no_selection_io_cause()</a> for details.</dd></dl>
<p>When used with type conversion, selection I/O requires the type conversion buffer (and the background buffer if applicable) be large enough to hold the entirety of the data involved in the I/O. For read operations, the library will use the application's read buffer as the type conversion buffer if the memory type is not smaller than the file type, eliminating the need for a separate type conversion buffer (a background buffer may still be required). For write operations, the library will similarly use the write buffer as a type conversion buffer, but only if <a class="el" href="#ga6f65ca81d8a10015513a69fe76c5d542" title="Allows the library to modify the contents of the write buffer.">H5Pset_modify_write_buf()</a> is used to allow the library to modify the contents of the write buffer.</p>
<dl class="section since"><dt>Since</dt><dd>1.14.1 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga10a80b29444d933da1aa2003f46cf003">◆ </a></span>H5Pset_type_conv_cb()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_type_conv_cb </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dxpl_id</em>, </span></td>
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<p>Sets user-defined datatype conversion callback function. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">dxpl_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">op</td><td>User-defined type conversion callback function </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">operate_data</td><td>User-defined input data for the callback function </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga10a80b29444d933da1aa2003f46cf003" title="Sets user-defined datatype conversion callback function.">H5Pset_type_conv_cb()</a> sets the user-defined datatype conversion callback function <code>op</code> in the dataset transfer property list <code>dxpl_id</code> </p>
<p>The parameter operate_data is a pointer to user-defined input data for the callback function and will be passed through to the callback function.</p>
<p>The callback function <code>op</code> defines the actions an application is to take when there is an exception during datatype conversion. The function prototype is as follows: </p><div class="fragment"><div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <a class="code hl_enumeration" href="_h5_tpublic_8h.html#ab0559be2b5911fe789b6b6f1fe94419a">H5T_conv_ret_t</a> (*<a class="code hl_typedef" href="_h5_tpublic_8h.html#a8825c3dcb04c35a26f8709791b1fdb5e">H5T_conv_except_func_t</a>)(<a class="code hl_enumeration" href="_h5_tpublic_8h.html#ab9a2209f1ee5e5bf2b4f75affa9a195b">H5T_conv_except_t</a> except_type, <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> src_id, <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dst_id,</div>
<div class="line"> <span class="keywordtype">void</span> *src_buf, <span class="keywordtype">void</span> *dst_buf, <span class="keywordtype">void</span> *user_data);</div>
</div><!-- fragment --><dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga2220ab75de470b6a6d5b1173d12aa0cf">◆ </a></span>H5Pset_vlen_mem_manager()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Pset_vlen_mem_manager </td>
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<td class="paramtype"><a class="el" href="_h5_m_mpublic_8h.html#a5fd832e4b7f42f93364153cb823e7ffa">H5MM_allocate_t</a></td> <td class="paramname"><span class="paramname"><em>alloc_func</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_m_mpublic_8h.html#aa34c7616be59673cfc3d63fa7d960f25">H5MM_free_t</a></td> <td class="paramname"><span class="paramname"><em>free_func</em>, </span></td>
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<p>Sets the memory manager for variable-length datatype allocation in <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread()</a> and <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim()</a> </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">alloc_func</td><td>User's allocate routine, or <code>NULL</code> for system <code>malloc</code> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">alloc_info</td><td>Extra parameter for user's allocation routine. Contents are ignored if preceding parameter is <code>NULL</code>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">free_func</td><td>User's free routine, or <code>NULL</code> for system <code>free</code> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">free_info</td><td>Extra parameter for user's free routine. Contents are ignored if preceding parameter is <code>NULL</code> </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga2220ab75de470b6a6d5b1173d12aa0cf" title="Sets the memory manager for variable-length datatype allocation in H5Dread() and H5Dvlen_reclaim()">H5Pset_vlen_mem_manager()</a> sets the memory manager for variable-length datatype allocation in <a class="el" href="group___h5_d.html#ga8287d5a7be7b8e55ffeff68f7d26811c" title="Reads raw data from a dataset into a provided buffer.">H5Dread()</a> and free in <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim()</a>.</p>
<p>The <code>alloc_func</code> and <code>free_func</code> parameters identify the memory management routines to be used. If the user has defined custom memory management routines, <code>alloc_func</code> and/or free_func should be set to make those routine calls (i.e., the name of the routine is used as the value of the parameter); if the user prefers to use the system's <code>malloc</code> and/or <code>free</code>, the <code>alloc_func</code> and <code>free_func</code> parameters, respectively, should be set to <code>NULL</code> </p>
<p>The prototypes for these user-defined functions are as follows: </p><div class="fragment"></div><!-- fragment --><div class="fragment"></div><!-- fragment --><p>The <code>alloc_info</code> and <code>free_info</code> parameters can be used to pass along any required information to the user's memory management routines.</p>
<p>In summary, if the user has defined custom memory management routines, the name(s) of the routines are passed in the <code>alloc_func</code> and <code>free_func</code> parameters and the custom routines' parameters are passed in the <code>alloc_info</code> and <code>free_info</code> parameters. If the user wishes to use the system <code>malloc</code> and <code>free</code> functions, the <code>alloc_func</code> and/or <code>free_func</code> parameters are set to <code>NULL</code> and the <code>alloc_info</code> and <code>free_info</code> parameters are ignored.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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