diff options
Diffstat (limited to 'src/H5Fpublic.h')
| -rw-r--r-- | src/H5Fpublic.h | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/src/H5Fpublic.h b/src/H5Fpublic.h index 48bfaaa..7120085 100644 --- a/src/H5Fpublic.h +++ b/src/H5Fpublic.h @@ -275,6 +275,31 @@ typedef herr_t (*H5F_flush_cb_t)(hid_t object_id, void *udata); * A boolean flag indicating whether the file opened with this FAPL entry * will be opened R/W. (i.e. as a VFD SWMR writer) * + * maintain_metadata_file + * A boolean flag indicating whether the writer should create and + * maintain the metadata file. Note that this field is only revelant + * if the above writer flag is TRUE. + * If this flag is TRUE, the writer must create and maintain the + * metadata file in the location specified in the md_file_path. + * Observe that at least one of maintain_metadata_file and + * generate_updater_files fields must be TRUE if writer is TRUE. + * + * generate_updater_files + * A boolean flag indicating whether the writer should generate a + * sequence of updater files describing how the metadata file + * should be updated at the end of each tick. + * If the flag is TRUE, all modifications to the metadata file + * (including its creation) are described in an ordered sequence of + * updater files. These files are read in order by auxiliary processes, + * and used to generate local copies of the metadata file as required. + * This mechanism exists to allow VFD SWMR to operate on storage + * systems that do not support POSIX semantics. + * This field is only used by the VFD SWMR writer. VFD SWMR readers + * ignore this field, as they always look to the specified metadata + * file, regardless of whether it is generated and maintained + * directly by the VFD SWMR writer, or by an auxiliary process that + * polls for new updater files, and applies them as they appear. + * * flush_raw_data: * A boolean flag indicating whether raw data should be flushed * as part of the end of tick processing. If set to TRUE, raw @@ -307,11 +332,16 @@ typedef herr_t (*H5F_flush_cb_t)(hid_t object_id, void *udata); * of tick is triggered. * * md_file_path: - * POSIX: this field contains the path of the metadata file. - * NFS: it contains the path and base name of the metadata file - * updater files. - * Object store: it contains the base URL for the objects used - * to store metadata file updater objects. + * If both the writer and maintain_metadata_file fields are TRUE, this + * field contains the path of the metadata file. + * If writer is FALSE, this field contains the path of the (possibly + * local copy of the) metadata file. + * + * updater_file_path: + * If generate_updater_files is TRUE, the contents of this field depends + * on whether the writer field is TRUE. If it is, the field contains + * the path and base name of the metadatea file updater files. + * If writer is FALSE, the field is ignored. * * log_file_path: * This field contains the path to the log file. If defined, this path should @@ -324,10 +354,13 @@ typedef struct H5F_vfd_swmr_config_t { uint32_t tick_len; uint32_t max_lag; hbool_t writer; + hbool_t maintain_metadata_file; + hbool_t generate_updater_files; hbool_t flush_raw_data; uint32_t md_pages_reserved; uint32_t pb_expansion_threshold; char md_file_path[H5F__MAX_VFD_SWMR_FILE_NAME_LEN + 1]; + char updater_file_path[H5F__MAX_VFD_SWMR_FILE_NAME_LEN + 1]; char log_file_path[H5F__MAX_VFD_SWMR_FILE_NAME_LEN + 1]; } H5F_vfd_swmr_config_t; @@ -1114,7 +1147,7 @@ H5_DLL herr_t H5Fget_mdc_config(hid_t file_id, H5AC_cache_config_t *config_ptr); * \since 1.8.0 * */ -H5_DLL herr_t H5Fset_mdc_config(hid_t file_id, H5AC_cache_config_t *config_ptr); +H5_DLL herr_t H5Fset_mdc_config(hid_t file_id, const H5AC_cache_config_t *config_ptr); /** * \ingroup MDC * @@ -1888,6 +1921,7 @@ H5_DLL herr_t H5Fset_mpi_atomicity(hid_t file_id, hbool_t flag); H5_DLL herr_t H5Fget_mpi_atomicity(hid_t file_id, hbool_t *flag); #endif /* H5_HAVE_PARALLEL */ +/// \cond DEV /* API Wrappers for async routines */ /* (Must be defined _after_ the function prototype) */ /* (And must only defined when included in application code, not the library) */ @@ -1907,6 +1941,7 @@ H5_DLL herr_t H5Fget_mpi_atomicity(hid_t file_id, hbool_t *flag); #define H5Fflush_async_wrap H5_NO_EXPAND(H5Fflush_async) #define H5Fclose_async_wrap H5_NO_EXPAND(H5Fclose_async) #endif /* H5F_MODULE */ +/// \endcond /* Symbols defined for compatibility with previous versions of the HDF5 API. * |