libgomp/config/posix/sem.h

   1 /* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU OpenMP Library (libgomp).
   5
   6    Libgomp is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU Lesser General Public License as published by
   8    the Free Software Foundation; either version 2.1 of the License, or
   9    (at your option) any later version.
  10
  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 Lesser General Public License for
  14    more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with libgomp; see the file COPYING.LIB.  If not, write to the
  18    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files, some
  22    of which are compiled with GCC, to produce an executable, this library
  23    does not by itself cause the resulting executable to be covered by the
  24    GNU General Public License.  This exception does not however invalidate
  25    any other reasons why the executable file might be covered by the GNU
  26    General Public License.  */
  27
  28 /* This is the default POSIX 1003.1b implementation of a semaphore
  29    synchronization mechanism for libgomp.  This type is private to
  30    the library.
  31
  32    This is a bit heavy weight for what we need, in that we're not
  33    interested in sem_wait as a cancelation point, but it's not too
  34    bad for a default.  */
  35
  36 #ifndef GOMP_SEM_H
  37 #define GOMP_SEM_H 1
  38
  39 #ifdef HAVE_ATTRIBUTE_VISIBILITY
  40 # pragma GCC visibility push(default)
  41 #endif
  42
  43 #include <semaphore.h>
  44
  45 #ifdef HAVE_ATTRIBUTE_VISIBILITY
  46 # pragma GCC visibility pop
  47 #endif
  48
  49 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  50 #include <pthread.h>
  51
  52 struct gomp_sem
  53 {
  54   pthread_mutex_t       mutex;
  55   pthread_cond_t        cond;
  56   int                   value;
  57 };
  58
  59 typedef struct gomp_sem gomp_sem_t;
  60
  61 extern void gomp_sem_init (gomp_sem_t *sem, int value);
  62
  63 extern void gomp_sem_wait (gomp_sem_t *sem);
  64
  65 extern void gomp_sem_post (gomp_sem_t *sem);
  66
  67 extern void gomp_sem_destroy (gomp_sem_t *sem);
  68
  69 #else /* HAVE_BROKEN_POSIX_SEMAPHORES  */
  70
  71 typedef sem_t gomp_sem_t;
  72
  73 static inline void gomp_sem_init (gomp_sem_t *sem, int value)
  74 {
  75   sem_init (sem, 0, value);
  76 }
  77
  78 extern void gomp_sem_wait (gomp_sem_t *sem);
  79
  80 static inline void gomp_sem_post (gomp_sem_t *sem)
  81 {
  82   sem_post (sem);
  83 }
  84
  85 static inline void gomp_sem_destroy (gomp_sem_t *sem)
  86 {
  87   sem_destroy (sem);
  88 }
  89 #endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES  */
  90 #endif /* GOMP_SEM_H  */