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Diffstat (limited to 'doxygen/examples/H5I_examples.c')
| -rw-r--r-- | doxygen/examples/H5I_examples.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/doxygen/examples/H5I_examples.c b/doxygen/examples/H5I_examples.c new file mode 100644 index 0000000..4aa4783 --- /dev/null +++ b/doxygen/examples/H5I_examples.c @@ -0,0 +1,242 @@ +/* -*- c-file-style: "stroustrup" -*- */ + +#include "hdf5.h" + +#include <assert.h> +#include <stdio.h> +#include <stdlib.h> + +int +main(void) +{ + int ret_val = EXIT_SUCCESS; + + //! <!-- [create] --> + { + __label__ fail_dcpl; + hid_t dcpl; + + // create an ID of a pre-defined ID type + if ((dcpl = H5Pcreate(H5P_DATASET_XFER)) == H5I_INVALID_HID) { + ret_val = EXIT_FAILURE; + goto fail_dcpl; + } + + // we can reliably predict the ID type + assert(H5Iget_type(dcpl) == H5I_GENPROP_LST); + printf("%d\n", H5Iget_type(dcpl)); + + H5Pclose(dcpl); +fail_dcpl:; + } + //! <!-- [create] --> + + //! <!-- [read] --> + { + __label__ fail_dcpl; + hid_t dcpl; + + // create an ID of a pre-defined ID type + if ((dcpl = H5Pcreate(H5P_DATASET_XFER)) == H5I_INVALID_HID) { + ret_val = EXIT_FAILURE; + goto fail_dcpl; + } + + // this better be valid + assert(H5Iis_valid(dcpl) > 0); + + // this ID is NOT associated with any HDF5 file; + // see the error message + assert(H5Iget_file_id(dcpl) == H5I_INVALID_HID); + + H5Pclose(dcpl); +fail_dcpl:; + } + //! <!-- [read] --> + + //! <!-- [update] --> + { + __label__ fail_rc, fail_dcpl; + hid_t dcpl; + int rc; + + // create an ID of a pre-defined ID type + if ((dcpl = H5Pcreate(H5P_DATASET_XFER)) == H5I_INVALID_HID) { + ret_val = EXIT_FAILURE; + goto fail_dcpl; + } + + // retrieve the IDs reference count + if ((rc = H5Iget_ref(dcpl)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_rc; + } + printf("Reference count: %d\n", rc); + + // bump its reference count (by 1) + if ((rc = H5Iinc_ref(dcpl)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_rc; + } + printf("Reference count: %d\n", rc); + +fail_rc: + H5Pclose(dcpl); +fail_dcpl:; + } + //! <!-- [update] --> + + //! <!-- [delete] --> + { + __label__ fail_rc, fail_dcpl; + hid_t dcpl; + int rc; + + // create an ID of a pre-defined ID type + if ((dcpl = H5Pcreate(H5P_DATASET_XFER)) == H5I_INVALID_HID) { + ret_val = EXIT_FAILURE; + goto fail_dcpl; + } + + // decrease its reference count (from 1) to 0 + if ((rc = H5Idec_ref(dcpl)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_rc; + } + printf("Reference count: %d\n", rc); + + // at this point, the ID is no longer valid + assert(H5Iis_valid(dcpl) == 0); + + // dropping the ref. count to 0 has the side-effect of closing + // the associated item, and calling H5Pclose would create an error + goto fail_dcpl; + +fail_rc: + H5Pclose(dcpl); +fail_dcpl:; + } + //! <!-- [delete] --> + + //! <!-- [create_ud] --> + herr_t free_func(void *obj) + { + printf("Calling free_func...\n"); + H5free_memory(obj); + return 0; + } + + { + __label__ fail_id, fail_obj, fail_register; + H5I_type_t type; + int * obj; + hid_t obj_id; + + // register a new ID type + if ((type = H5Iregister_type(128, 1024, &free_func)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_register; + } + printf("New identifier type ID: %d\n", type); + + // create a new object + if ((obj = H5allocate_memory(10 * sizeof(int), 0)) == NULL) { + ret_val = EXIT_FAILURE; + goto fail_obj; + } + + // obtain an ID for the new object + if ((obj_id = H5Iregister(type, obj)) == H5I_INVALID_HID) { + ret_val = EXIT_FAILURE; + goto fail_id; + } + printf("New object identifier: %ld\n", obj_id); + +fail_id: + H5Iclear_type(type, 1); +fail_obj: + H5Idestroy_type(type); +fail_register:; + } + //! <!-- [create_ud] --> + + //! <!-- [read_ud] --> + { + __label__ fail_query, fail_register; + H5I_type_t type; + hsize_t count; + + // register a new ID type + if ((type = H5Iregister_type(128, 1024, NULL)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_register; + } + printf("New FOO identifier type ID: %d\n", type); + + // return the number of identifiers of TYPE currently in use + if (H5Inmembers(type, &count) < 0) { + ret_val = EXIT_FAILURE; + goto fail_query; + } + printf("%llu FOO identifiers in use\n", count); + +fail_query: + H5Idestroy_type(type); +fail_register:; + } + //! <!-- [read_ud] --> + + //! <!-- [update_ud] --> + { + __label__ fail_id, fail_register; + H5I_type_t type; + int obj = 42; + hid_t obj_id; + + // register a new ID type + if ((type = H5Iregister_type(128, 1024, NULL)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_register; + } + printf("New identifier type ID: %d\n", type); + + // obtain an ID for the new object + if ((obj_id = H5Iregister(type, &obj)) == H5I_INVALID_HID) { + ret_val = EXIT_FAILURE; + goto fail_id; + } + printf("New object identifier: %ld\n", obj_id); + + // bump the reference count + assert(H5Iinc_ref(obj_id) == 2); + + // force the deletion of all IDs regardless of reference count + H5Iclear_type(type, 1); +fail_id: + H5Idestroy_type(type); +fail_register:; + } + //! <!-- [update_ud] --> + + //! <!-- [delete_ud] --> + { + __label__ fail_register; + H5I_type_t type; + + // register a new ID type + if ((type = H5Iregister_type(128, 1024, NULL)) < 0) { + ret_val = EXIT_FAILURE; + goto fail_register; + } + printf("New identifier type ID: %d\n", type); + + // decrementing the identifier type's ref. count to 0 triggers + // the type to be destroyed + assert(H5Idec_type_ref(type) == 0); + +fail_register:; + } + //! <!-- [delete_ud] --> + + return ret_val; +} |