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/*
* pthread_once.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
int
pthread_once (pthread_once_t * once_control, void (PTW32_CDECL *init_routine) (void))
{
if (once_control == NULL || init_routine == NULL)
{
return EINVAL;
}
if ((PTW32_INTERLOCKED_LONG)PTW32_FALSE ==
(PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_EXCHANGE_ADD_LONG((PTW32_INTERLOCKED_LONGPTR)&once_control->done,
(PTW32_INTERLOCKED_LONG)0)) /* MBR fence */
{
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire((ptw32_mcs_lock_t *)&once_control->lock, &node);
if (!once_control->done)
{
#if defined(PTW32_CONFIG_MSVC7)
#pragma inline_depth(0)
#endif
pthread_cleanup_push(ptw32_mcs_lock_release, &node);
(*init_routine)();
pthread_cleanup_pop(0);
#if defined(PTW32_CONFIG_MSVC7)
#pragma inline_depth()
#endif
once_control->done = PTW32_TRUE;
}
ptw32_mcs_lock_release(&node);
}
return 0;
} /* pthread_once */
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