From 3ef98898333255b8000e9ab4801652c42fd5aacc Mon Sep 17 00:00:00 2001 From: rpj Date: Mon, 25 Apr 2005 14:42:37 +0000 Subject: '' --- ptw32_semwait.c | 236 ++++++++++++++++++++++++++++---------------------------- 1 file changed, 118 insertions(+), 118 deletions(-) (limited to 'ptw32_semwait.c') diff --git a/ptw32_semwait.c b/ptw32_semwait.c index 209c8a6..8b23d11 100644 --- a/ptw32_semwait.c +++ b/ptw32_semwait.c @@ -1,118 +1,118 @@ -/* - * ptw32_semwait.c - * - * Description: - * This translation unit implements mutual exclusion (mutex) primitives. - * - * -------------------------------------------------------------------------- - * - * Pthreads-win32 - POSIX Threads Library for Win32 - * Copyright(C) 1998 John E. Bossom - * Copyright(C) 1999,2005 Pthreads-win32 contributors - * - * Contact Email: rpj@callisto.canberra.edu.au - * - * 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 - */ - -#ifndef _UWIN -//# include -#endif -#include "pthread.h" -#include "implement.h" - - -int -ptw32_semwait (sem_t * sem) - /* - * ------------------------------------------------------ - * DESCRIPTION - * This function waits on a POSIX semaphore. If the - * semaphore value is greater than zero, it decreases - * its value by one. If the semaphore value is zero, then - * the calling thread (or process) is blocked until it can - * successfully decrease the value. - * - * Unlike sem_wait(), this routine is non-cancelable. - * - * RESULTS - * 0 successfully decreased semaphore, - * -1 failed, error in errno. - * ERRNO - * EINVAL 'sem' is not a valid semaphore, - * ENOSYS semaphores are not supported, - * EINTR the function was interrupted by a signal, - * EDEADLK a deadlock condition was detected. - * - * ------------------------------------------------------ - */ -{ - int result = 0; - sem_t s = *sem; - - if (s == NULL) - { - result = EINVAL; - } - else - { - if ((result = pthread_mutex_lock (&s->lock)) == 0) - { - int v = --s->value; - - (void) pthread_mutex_unlock (&s->lock); - - if (v < 0) - { - /* Must wait */ - if (WaitForSingleObject (s->sem, INFINITE) == WAIT_OBJECT_0) - { -#ifdef NEED_SEM - if (pthread_mutex_lock (&s->lock) == 0) - { - if (s->leftToUnblock > 0) - { - --s->leftToUnblock; - SetEvent(s->sem); - } - (void) pthread_mutex_unlock (&s->lock); - } -#endif - return 0; - } - } - else - { - return 0; - } - } - } - - if (result != 0) - { - errno = result; - return -1; - } - - return 0; - -} /* ptw32_semwait */ +/* + * ptw32_semwait.c + * + * Description: + * This translation unit implements mutual exclusion (mutex) primitives. + * + * -------------------------------------------------------------------------- + * + * Pthreads-win32 - POSIX Threads Library for Win32 + * Copyright(C) 1998 John E. Bossom + * Copyright(C) 1999,2005 Pthreads-win32 contributors + * + * Contact Email: rpj@callisto.canberra.edu.au + * + * 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 + */ + +#ifndef _UWIN +//# include +#endif +#include "pthread.h" +#include "implement.h" + + +int +ptw32_semwait (sem_t * sem) + /* + * ------------------------------------------------------ + * DESCRIPTION + * This function waits on a POSIX semaphore. If the + * semaphore value is greater than zero, it decreases + * its value by one. If the semaphore value is zero, then + * the calling thread (or process) is blocked until it can + * successfully decrease the value. + * + * Unlike sem_wait(), this routine is non-cancelable. + * + * RESULTS + * 0 successfully decreased semaphore, + * -1 failed, error in errno. + * ERRNO + * EINVAL 'sem' is not a valid semaphore, + * ENOSYS semaphores are not supported, + * EINTR the function was interrupted by a signal, + * EDEADLK a deadlock condition was detected. + * + * ------------------------------------------------------ + */ +{ + int result = 0; + sem_t s = *sem; + + if (s == NULL) + { + result = EINVAL; + } + else + { + if ((result = pthread_mutex_lock (&s->lock)) == 0) + { + int v = --s->value; + + (void) pthread_mutex_unlock (&s->lock); + + if (v < 0) + { + /* Must wait */ + if (WaitForSingleObject (s->sem, INFINITE) == WAIT_OBJECT_0) + { +#ifdef NEED_SEM + if (pthread_mutex_lock (&s->lock) == 0) + { + if (s->leftToUnblock > 0) + { + --s->leftToUnblock; + SetEvent(s->sem); + } + (void) pthread_mutex_unlock (&s->lock); + } +#endif + return 0; + } + } + else + { + return 0; + } + } + } + + if (result != 0) + { + errno = result; + return -1; + } + + return 0; + +} /* ptw32_semwait */ -- cgit v1.2.3