1 /* Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
4 This file is part of the GNU OpenMP Library (libgomp).
6 Libgomp is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
25 /* This is the default POSIX 1003.1b implementation of a semaphore
26 synchronization mechanism for libgomp. This type is private to
29 This is a bit heavy weight for what we need, in that we're not
30 interested in sem_wait as a cancelation point, but it's not too
35 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES
38 void gomp_sem_init (gomp_sem_t
*sem
, int value
)
42 ret
= pthread_mutex_init (&sem
->mutex
, NULL
);
46 ret
= pthread_cond_init (&sem
->cond
, NULL
);
53 void gomp_sem_wait (gomp_sem_t
*sem
)
57 ret
= pthread_mutex_lock (&sem
->mutex
);
64 ret
= pthread_mutex_unlock (&sem
->mutex
);
68 while (sem
->value
<= 0)
70 ret
= pthread_cond_wait (&sem
->cond
, &sem
->mutex
);
73 pthread_mutex_unlock (&sem
->mutex
);
79 ret
= pthread_mutex_unlock (&sem
->mutex
);
83 void gomp_sem_post (gomp_sem_t
*sem
)
87 ret
= pthread_mutex_lock (&sem
->mutex
);
93 ret
= pthread_mutex_unlock (&sem
->mutex
);
97 ret
= pthread_cond_signal (&sem
->cond
);
102 void gomp_sem_destroy (gomp_sem_t
*sem
)
106 ret
= pthread_mutex_destroy (&sem
->mutex
);
110 ret
= pthread_cond_destroy (&sem
->cond
);
114 #else /* HAVE_BROKEN_POSIX_SEMAPHORES */
116 gomp_sem_wait (gomp_sem_t
*sem
)
118 /* With POSIX, the wait can be canceled by signals. We don't want that.
119 It is expected that the return value here is -1 and errno is EINTR. */
120 while (sem_wait (sem
) != 0)