/* * pthread_once.c * * Description: * This translation unit implements miscellaneous thread functions. * * -------------------------------------------------------------------------- * * Pthreads-win32 - POSIX Threads Library for Win32 * Copyright(C) 1998 John E. Bossom * Copyright(C) 1999,2012 Pthreads-win32 contributors * * Homepage1: http://sourceware.org/pthreads-win32/ * Homepage2: http://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: * http://sources.redhat.com/pthreads-win32/contributors.html * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library in the file COPYING.LIB; * if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #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 */