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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://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "H5private.h" /* H5_ATTR_UNUSED */
#include "H5Fpublic.h"
#include "H5FDvfd_swmr.h"
/* vfd_swmr_writer_may_increase_tick_to() and
* vfd_swmr_reader_did_increase_tick_to() are instrumentation points for
* VFD SWMR tests to use to coordinate the tick-number increases
* on a single writer with the progress of a single reader.
*
* This file provides the default, do-nothing implementations for both
* instrumentation routines.
*
* A VFD SWMR writer calls vfd_swmr_writer_may_increase_tick_to() with the
* increased tick number that it proposes, `tick_num`. The argument
* `wait_for_reader` tells whether or not the writer can wait for the reader
* before increasing its tick number. If `true`, then
* vfd_swmr_writer_may_increase_tick_to() should
* block until the reader is finished using the shadow-file content
* from ticks `tick_num - max_lag` and before, returning `true`.
* If `false`, then
* vfd_swmr_writer_may_increase_tick_to() immediately return `true` if
* the new tick number does permissible, otherwise `false`.
*
* After a VFD SWMR reader increases its tick number, it calls
* vfd_swmr_reader_did_increase_tick_to() with the new tick number.
*
* The test programs test/vfd_swmr_zoo_{reader,writer} provide
* their own vfd_swmr_writer_may_increase_tick_to() and
* vfd_swmr_reader_did_increase_tick_to() implementations that override the
* ones in the library. In the "zoo"
* test (test/vfd_swmr_zoo_{reader,writer}), the reader and the writer
* use a shared file to coordinate tick-number increases so that the writer
* can call H5Fvfd_swmr_end_tick() to increase its tick number at an arbitrary
* rate without outrunning the reader.
*/
bool
vfd_swmr_writer_may_increase_tick_to(uint64_t H5_ATTR_UNUSED tick_num,
bool H5_ATTR_UNUSED wait_for_reader)
{
return true;
}
void
vfd_swmr_reader_did_increase_tick_to(uint64_t H5_ATTR_UNUSED tick_num)
{
return;
}
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