libgomp/config/posix/sem.h

   1 /* Copyright (C) 2005-2017 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Offloading and Multi Processing Library
   5    (libgomp).
   6
   7    Libgomp is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15    more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 /* This is the default POSIX 1003.1b implementation of a semaphore
  27    synchronization mechanism for libgomp.  This type is private to
  28    the library.
  29
  30    This is a bit heavy weight for what we need, in that we're not
  31    interested in sem_wait as a cancelation point, but it's not too
  32    bad for a default.  */
  33
  34 #ifndef GOMP_SEM_H
  35 #define GOMP_SEM_H 1
  36
  37 #ifdef HAVE_ATTRIBUTE_VISIBILITY
  38 # pragma GCC visibility push(default)
  39 #endif
  40
  41 #include <semaphore.h>
  42
  43 #ifdef HAVE_ATTRIBUTE_VISIBILITY
  44 # pragma GCC visibility pop
  45 #endif
  46
  47 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  48 #include <pthread.h>
  49
  50 struct gomp_sem
  51 {
  52   pthread_mutex_t       mutex;
  53   pthread_cond_t        cond;
  54   int                   value;
  55 };
  56
  57 typedef struct gomp_sem gomp_sem_t;
  58
  59 extern void gomp_sem_init (gomp_sem_t *sem, int value);
  60
  61 extern void gomp_sem_wait (gomp_sem_t *sem);
  62
  63 extern void gomp_sem_post (gomp_sem_t *sem);
  64
  65 extern void gomp_sem_destroy (gomp_sem_t *sem);
  66
  67 #else /* HAVE_BROKEN_POSIX_SEMAPHORES  */
  68
  69 typedef sem_t gomp_sem_t;
  70
  71 static inline void gomp_sem_init (gomp_sem_t *sem, int value)
  72 {
  73   sem_init (sem, 0, value);
  74 }
  75
  76 extern void gomp_sem_wait (gomp_sem_t *sem);
  77
  78 static inline void gomp_sem_post (gomp_sem_t *sem)
  79 {
  80   sem_post (sem);
  81 }
  82
  83 static inline void gomp_sem_destroy (gomp_sem_t *sem)
  84 {
  85   sem_destroy (sem);
  86 }
  87 #endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES  */
  88 #endif /* GOMP_SEM_H  */