diff options
Diffstat (limited to 'libs/pthreads/src/sem_post_multiple.c')
| -rw-r--r-- | libs/pthreads/src/sem_post_multiple.c | 180 |
1 files changed, 85 insertions, 95 deletions
diff --git a/libs/pthreads/src/sem_post_multiple.c b/libs/pthreads/src/sem_post_multiple.c index 44c168c6cf..cab9c46a2d 100644 --- a/libs/pthreads/src/sem_post_multiple.c +++ b/libs/pthreads/src/sem_post_multiple.c @@ -13,34 +13,38 @@ * * -------------------------------------------------------------------------- * - * Pthreads-win32 - POSIX Threads Library for Win32 + * Pthreads4w - 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 - * + * 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: - * 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 + * 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 "semaphore.h" #include "implement.h" @@ -48,95 +52,81 @@ int sem_post_multiple (sem_t * sem, int count) - /* - * ------------------------------------------------------ - * DOCPUBLIC - * This function posts multiple wakeups to a semaphore. - * - * PARAMETERS - * sem - * pointer to an instance of sem_t - * - * count - * counter, must be greater than zero. - * - * DESCRIPTION - * This function posts multiple wakeups to a semaphore. If there - * are waiting threads (or processes), n <= count are awakened; - * the semaphore value is incremented by count - n. - * - * RESULTS - * 0 successfully posted semaphore, - * -1 failed, error in errno - * ERRNO - * EINVAL 'sem' is not a valid semaphore - * or count is less than or equal to zero. - * ERANGE semaphore count is too big - * - * ------------------------------------------------------ - */ +/* + * ------------------------------------------------------ + * DOCPUBLIC + * This function posts multiple wakeups to a semaphore. + * + * PARAMETERS + * sem + * pointer to an instance of sem_t + * + * count + * counter, must be greater than zero. + * + * DESCRIPTION + * This function posts multiple wakeups to a semaphore. If there + * are waiting threads (or processes), n <= count are awakened; + * the semaphore value is incremented by count - n. + * + * RESULTS + * 0 successfully posted semaphore, + * -1 failed, error in errno + * ERRNO + * EINVAL 'sem' is not a valid semaphore + * or count is less than or equal to zero. + * ERANGE semaphore count is too big + * + * ------------------------------------------------------ + */ { + ptw32_mcs_local_node_t node; int result = 0; long waiters; sem_t s = *sem; - if (s == NULL || count <= 0) - { - result = EINVAL; - } - else if ((result = pthread_mutex_lock (&s->lock)) == 0) + ptw32_mcs_lock_acquire(&s->lock, &node); + + if (s->value <= (SEM_VALUE_MAX - count)) { - /* See sem_destroy.c - */ - if (*sem == NULL) + waiters = -s->value; + s->value += count; + if (waiters > 0) { - (void) pthread_mutex_unlock (&s->lock); - result = EINVAL; - return -1; - } - - if (s->value <= (SEM_VALUE_MAX - count)) - { - waiters = -s->value; - s->value += count; - if (waiters > 0) - { #if defined(NEED_SEM) - if (SetEvent(s->sem)) - { - waiters--; - s->leftToUnblock += count - 1; - if (s->leftToUnblock > waiters) - { - s->leftToUnblock = waiters; - } - } + if (SetEvent(s->sem)) + { + waiters--; + s->leftToUnblock += count - 1; + if (s->leftToUnblock > waiters) + { + s->leftToUnblock = waiters; + } + } #else - if (ReleaseSemaphore (s->sem, (waiters<=count)?waiters:count, 0)) - { - /* No action */ - } + if (ReleaseSemaphore (s->sem, (waiters<=count)?waiters:count, 0)) + { + /* No action */ + } #endif - else - { - s->value -= count; - result = EINVAL; - } - } - } - else - { - result = ERANGE; - } - (void) pthread_mutex_unlock (&s->lock); + else + { + s->value -= count; + result = EINVAL; + } + } } + else + { + result = ERANGE; + } + ptw32_mcs_lock_release(&node); if (result != 0) { - errno = result; + PTW32_SET_ERRNO(result); return -1; } return 0; - -} /* sem_post_multiple */ +} |