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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libgomp/config/posix/sem.c
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diff --git a/libgomp/config/posix/sem.c b/libgomp/config/posix/sem.c
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+/* Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
+ Contributed by Richard Henderson <rth@redhat.com>.
+
+ This file is part of the GNU OpenMP Library (libgomp).
+
+ Libgomp 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, or (at your option)
+ any later version.
+
+ Libgomp 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.
+
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* This is the default POSIX 1003.1b implementation of a semaphore
+ synchronization mechanism for libgomp. This type is private to
+ the library.
+
+ This is a bit heavy weight for what we need, in that we're not
+ interested in sem_wait as a cancelation point, but it's not too
+ bad for a default. */
+
+#include "libgomp.h"
+
+#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
+#include <stdlib.h>
+
+void gomp_sem_init (gomp_sem_t *sem, int value)
+{
+ int ret;
+
+ ret = pthread_mutex_init (&sem->mutex, NULL);
+ if (ret)
+ return;
+
+ ret = pthread_cond_init (&sem->cond, NULL);
+ if (ret)
+ return;
+
+ sem->value = value;
+}
+
+void gomp_sem_wait (gomp_sem_t *sem)
+{
+ int ret;
+
+ ret = pthread_mutex_lock (&sem->mutex);
+ if (ret)
+ return;
+
+ if (sem->value > 0)
+ {
+ sem->value--;
+ ret = pthread_mutex_unlock (&sem->mutex);
+ return;
+ }
+
+ while (sem->value <= 0)
+ {
+ ret = pthread_cond_wait (&sem->cond, &sem->mutex);
+ if (ret)
+ {
+ pthread_mutex_unlock (&sem->mutex);
+ return;
+ }
+ }
+
+ sem->value--;
+ ret = pthread_mutex_unlock (&sem->mutex);
+ return;
+}
+
+void gomp_sem_post (gomp_sem_t *sem)
+{
+ int ret;
+
+ ret = pthread_mutex_lock (&sem->mutex);
+ if (ret)
+ return;
+
+ sem->value++;
+
+ ret = pthread_mutex_unlock (&sem->mutex);
+ if (ret)
+ return;
+
+ ret = pthread_cond_signal (&sem->cond);
+
+ return;
+}
+
+void gomp_sem_destroy (gomp_sem_t *sem)
+{
+ int ret;
+
+ ret = pthread_mutex_destroy (&sem->mutex);
+ if (ret)
+ return;
+
+ ret = pthread_cond_destroy (&sem->cond);
+
+ return;
+}
+#else /* HAVE_BROKEN_POSIX_SEMAPHORES */
+void
+gomp_sem_wait (gomp_sem_t *sem)
+{
+ /* With POSIX, the wait can be canceled by signals. We don't want that.
+ It is expected that the return value here is -1 and errno is EINTR. */
+ while (sem_wait (sem) != 0)
+ continue;
+}
+#endif