80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
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/*
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* pthread_once.c
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*
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* Description:
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* This translation unit implements miscellaneous thread functions.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_once (pthread_once_t * once_control, void (PTW32_CDECL *init_routine) (void))
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{
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if (once_control == NULL || init_routine == NULL)
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{
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return EINVAL;
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}
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if ((PTW32_INTERLOCKED_LONG)PTW32_FALSE ==
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(PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_EXCHANGE_ADD_LONG((PTW32_INTERLOCKED_LONGPTR)&once_control->done,
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(PTW32_INTERLOCKED_LONG)0)) /* MBR fence */
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{
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ptw32_mcs_local_node_t node;
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ptw32_mcs_lock_acquire((ptw32_mcs_lock_t *)&once_control->lock, &node);
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if (!once_control->done)
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{
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#if defined(_MSC_VER) && _MSC_VER < 1400
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#pragma inline_depth(0)
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#endif
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pthread_cleanup_push(ptw32_mcs_lock_release, &node);
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(*init_routine)();
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pthread_cleanup_pop(0);
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#if defined(_MSC_VER) && _MSC_VER < 1400
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#pragma inline_depth()
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#endif
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once_control->done = PTW32_TRUE;
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}
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ptw32_mcs_lock_release(&node);
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}
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return 0;
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} /* pthread_once */
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