From 3ef98898333255b8000e9ab4801652c42fd5aacc Mon Sep 17 00:00:00 2001 From: rpj Date: Mon, 25 Apr 2005 14:42:37 +0000 Subject: '' --- sem_destroy.c | 292 +++++++++++++++++++++++++++++----------------------------- 1 file changed, 146 insertions(+), 146 deletions(-) (limited to 'sem_destroy.c') diff --git a/sem_destroy.c b/sem_destroy.c index c260d41..96734d1 100644 --- a/sem_destroy.c +++ b/sem_destroy.c @@ -1,146 +1,146 @@ -/* - * ------------------------------------------------------------- - * - * Module: sem_destroy.c - * - * Purpose: - * Semaphores aren't actually part of the PThreads standard. - * They are defined by the POSIX Standard: - * - * POSIX 1003.1b-1993 (POSIX.1b) - * - * ------------------------------------------------------------- - * - * -------------------------------------------------------------------------- - * - * 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 - */ - -#include "pthread.h" -#include "semaphore.h" -#include "implement.h" - - -int -sem_destroy (sem_t * sem) - /* - * ------------------------------------------------------ - * DOCPUBLIC - * This function destroys an unnamed semaphore. - * - * PARAMETERS - * sem - * pointer to an instance of sem_t - * - * DESCRIPTION - * This function destroys an unnamed semaphore. - * - * RESULTS - * 0 successfully destroyed semaphore, - * -1 failed, error in errno - * ERRNO - * EINVAL 'sem' is not a valid semaphore, - * ENOSYS semaphores are not supported, - * EBUSY threads (or processes) are currently - * blocked on 'sem' - * - * ------------------------------------------------------ - */ -{ - int result = 0; - sem_t s = NULL; - - if (sem == NULL || *sem == NULL) - { - result = EINVAL; - } - else - { - s = *sem; - *sem = NULL; - - if ((result = pthread_mutex_trylock (&s->lock)) == 0) - { - if (s->value >= 0) - { - (void) pthread_mutex_unlock (&s->lock); - - if (!CloseHandle (s->sem)) - { - *sem = s; - result = EINVAL; - } - else if ((result = pthread_mutex_destroy (&s->lock)) != 0) - { - -#ifdef NEED_SEM - s->sem = CreateEvent (NULL, - PTW32_FALSE, /* manual reset is false */ - PTW32_FALSE, /* initial state is unset */ - NULL); -#else - s->sem = CreateSemaphore (NULL, /* Always NULL */ - (long) 0, /* Force threads to wait */ - (long) _POSIX_SEM_VALUE_MAX, /* Maximum value */ - NULL); /* Name */ -#endif - - if (s->sem == 0) - { - /* We just have to pretend that we've destroyed the semaphore - * even though we're leaving a mutex around. - */ - result = 0; - } - else - { - *sem = s; - if (result != EBUSY) - result = EINVAL; - } - } - } - else - { - (void) pthread_mutex_unlock (&s->lock); - result = EBUSY; - } - } - } - - if (result != 0) - { - errno = result; - return -1; - } - - free (s); - - return 0; - -} /* sem_destroy */ +/* + * ------------------------------------------------------------- + * + * Module: sem_destroy.c + * + * Purpose: + * Semaphores aren't actually part of the PThreads standard. + * They are defined by the POSIX Standard: + * + * POSIX 1003.1b-1993 (POSIX.1b) + * + * ------------------------------------------------------------- + * + * -------------------------------------------------------------------------- + * + * 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 + */ + +#include "pthread.h" +#include "semaphore.h" +#include "implement.h" + + +int +sem_destroy (sem_t * sem) + /* + * ------------------------------------------------------ + * DOCPUBLIC + * This function destroys an unnamed semaphore. + * + * PARAMETERS + * sem + * pointer to an instance of sem_t + * + * DESCRIPTION + * This function destroys an unnamed semaphore. + * + * RESULTS + * 0 successfully destroyed semaphore, + * -1 failed, error in errno + * ERRNO + * EINVAL 'sem' is not a valid semaphore, + * ENOSYS semaphores are not supported, + * EBUSY threads (or processes) are currently + * blocked on 'sem' + * + * ------------------------------------------------------ + */ +{ + int result = 0; + sem_t s = NULL; + + if (sem == NULL || *sem == NULL) + { + result = EINVAL; + } + else + { + s = *sem; + *sem = NULL; + + if ((result = pthread_mutex_trylock (&s->lock)) == 0) + { + if (s->value >= 0) + { + (void) pthread_mutex_unlock (&s->lock); + + if (!CloseHandle (s->sem)) + { + *sem = s; + result = EINVAL; + } + else if ((result = pthread_mutex_destroy (&s->lock)) != 0) + { + +#ifdef NEED_SEM + s->sem = CreateEvent (NULL, + PTW32_FALSE, /* manual reset is false */ + PTW32_FALSE, /* initial state is unset */ + NULL); +#else + s->sem = CreateSemaphore (NULL, /* Always NULL */ + (long) 0, /* Force threads to wait */ + (long) _POSIX_SEM_VALUE_MAX, /* Maximum value */ + NULL); /* Name */ +#endif + + if (s->sem == 0) + { + /* We just have to pretend that we've destroyed the semaphore + * even though we're leaving a mutex around. + */ + result = 0; + } + else + { + *sem = s; + if (result != EBUSY) + result = EINVAL; + } + } + } + else + { + (void) pthread_mutex_unlock (&s->lock); + result = EBUSY; + } + } + } + + if (result != 0) + { + errno = result; + return -1; + } + + free (s); + + return 0; + +} /* sem_destroy */ -- cgit v1.2.3