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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Programmer: Quincey Koziol
* Monday, April 6, 2020
*
* Purpose: This file contains declarations which define macros for the
* H5ES package. Including this header means that the source file
* is part of the H5ES package.
*/
#ifndef H5ESmodule_H
#define H5ESmodule_H
/* Define the proper control macros for the generic FUNC_ENTER/LEAVE and error
* reporting macros.
*/
#define H5ES_MODULE
#define H5_MY_PKG H5ES
#define H5_MY_PKG_ERR H5E_EVENTSET
/** \page H5ES_UG The HDF5 Event Set
* @todo Under Construction
*
* \section sec_async The HDF5 Event Set Interface
*
* \section subsec_async_intro Introduction
* HDF5 provides asynchronous APIs for the HDF5 VOL connectors that support asynchronous HDF5
* operations using the HDF5 Event Set (H5ES) API. This allows I/O to proceed in the background
* while the application is performing other tasks.
*
* To support AIO capabilities for the HDF5 VOL connectors, the AIO versions for the functions
* listed in the table below were added to HDF5 library version 1.14.0 and later. The async version
* of the function has “_async” suffix added to the function name. For example, the async version
* for H5Fcreate is H5Fcreate_async.
*
* <table>
* <tr>
* <th>Interface</th>
* <th>Functions</th>
* </tr>
* <tr>
* <th>H5F</th>
* <td>#H5Fcreate, #H5Fflush, #H5Fis_accessible, #H5Fopen, #H5Fclose
* </td>
* </tr>
* <tr>
* <th>H5G</th>
* <td>#H5Gcreate, #H5Gget_info, #H5Gget_info_by_idx, #H5Gget_info_by_name, #H5Gclose
* </td>
* </tr>
* <tr>
* <th>H5D</th>
* <td>#H5Dcreate, #H5Dopen, #H5Dset_extent, #H5Dwrite, #H5Dread, #H5Dget_space, #H5Dclose
* </td>
* </tr>
* <tr>
* <th>H5A</th>
* <td>#H5Acreate, #H5Acreate_by_name, #H5Aopen, #H5Aopen_by_name, #H5Aexists, #H5Awrite, #H5Aread,
#H5Aclose, #H5Aopen_by_idx, #H5Arename, #H5Arename_by_name
* </td>
* </tr>
* <tr>
* <th>H5L</th>
* <td>#H5Lcreate_hard, #H5Lcreate_soft, #H5Ldelete, #H5Ldelete_by_idx, #H5Lexists
* </td>
* </tr>
* <tr>
* <th>H5O</th>
* <td>#H5Ocopy, #H5Orefresh, #H5Oflush, #H5Oclose, #H5Oopen, #H5Oopen_by_idx
* </td>
* </tr>
* <tr>
* <th>H5R</th>
* <td>#H5Ropen_attr, #H5Ropen_object #H5Ropen_region, #H5Rdereference
* </td>
* </tr>
* <tr>
* <th>H5M</th>
* <td>#H5Mcreate, #H5Mopen, #H5Mput, #H5Mget, #H5Mclose
* </td>
* </tr>
* <tr>
* <th>H5T</th>
* <td>#H5Tcommit, #H5Topen, #H5Tcopy, #H5Tclose
* </td>
* </tr>
* </table>
*
* Async versions of the functions have an extra parameter called the event set parameter or es_id.
* For example, compare the signatures of #H5Dclose and #H5Dclose_async:
* \code
* herr_t H5Dclose(hid_t dset_id);
* herr_t H5Dclose_async(hid_t dset_id, hid_t es_id);
* \endcode
*
* An event set is an in-memory object that is created by an application and used to track many
* asynchronous operations with a single object. They function like a "bag" -- holding request
* tokens from one or more asynchronous operations and provide a simple interface for inspecting
* the status of the entire set of operations.
*
* See the \ref H5ES APIs that were added to the HDF5 library to manage event sets.
*
* Previous Chapter \ref sec_vol - Next Chapter \ref sec_map
*
*/
/**\defgroup H5ES Event Set Interface (H5ES)
*
* \todo Add the event set life cycle.
*
* \brief Event Set Interface
*
* \details \Bold{This interface can only be used with the HDF5 VOL connectors that
* enable the asynchronous feature in HDF5.} The native HDF5 library has
* only synchronous operations.
*
* HDF5 VOL connectors with support for asynchronous operations:
* - ASYNC
* - DAOS
*
* \par Example:
* \code
* fid = H5Fopen(..);
* gid = H5Gopen(fid, ..); //Starts when H5Fopen completes
* did = H5Dopen(gid, ..); //Starts when H5Gopen completes
*
* es_id = H5EScreate(); // Create event set for tracking async operations
* status = H5Dwrite_async(did, .., es_id); //Asynchronous, starts when H5Dopen completes,
* // may run concurrently with other H5Dwrite_async
* // in event set.
* status = H5Dwrite_async(did, .., es_id); //Asynchronous, starts when H5Dopen completes,
* // may run concurrently with other H5Dwrite_async
* // in event set....
* <other user code>
* ...
* H5ESwait(es_id); // Wait for operations in event set to complete, buffers
* // used for H5Dwrite_async must only be changed after wait
* // returns.
* \endcode
*/
#endif /* H5ESmodule_H */
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