libgomp/config/posix/lock.c

   1 /* Copyright (C) 2005 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 PTHREADS implementation of the public OpenMP
  29    locking primitives.
  30
  31    Because OpenMP uses different entry points for normal and recursive
  32    locks, and pthreads uses only one entry point, a system may be able
  33    to do better and streamline the locking as well as reduce the size
  34    of the types exported.  */
  35
  36 /* We need Unix98 extensions to get recursive locks.  On Tru64 UNIX V4.0F,
  37    the declarations are available without _XOPEN_SOURCE, which actually
  38    breaks compilation.  */
  39 #ifndef __osf__
  40 #define _XOPEN_SOURCE 500
  41 #endif
  42
  43 #include "libgomp.h"
  44
  45
  46 void
  47 omp_init_lock (omp_lock_t *lock)
  48 {
  49   pthread_mutex_init (lock, NULL);
  50 }
  51
  52 void
  53 omp_destroy_lock (omp_lock_t *lock)
  54 {
  55   pthread_mutex_destroy (lock);
  56 }
  57
  58 void
  59 omp_set_lock (omp_lock_t *lock)
  60 {
  61   pthread_mutex_lock (lock);
  62 }
  63
  64 void
  65 omp_unset_lock (omp_lock_t *lock)
  66 {
  67   pthread_mutex_unlock (lock);
  68 }
  69
  70 int
  71 omp_test_lock (omp_lock_t *lock)
  72 {
  73   return pthread_mutex_trylock (lock) == 0;
  74 }
  75
  76 void
  77 omp_init_nest_lock (omp_nest_lock_t *lock)
  78 {
  79   pthread_mutexattr_t attr;
  80
  81   pthread_mutexattr_init (&attr);
  82   pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
  83   pthread_mutex_init (&lock->lock, &attr);
  84   lock->count = 0;
  85   pthread_mutexattr_destroy (&attr);
  86 }
  87
  88 void
  89 omp_destroy_nest_lock (omp_nest_lock_t *lock)
  90 {
  91   pthread_mutex_destroy (&lock->lock);
  92 }
  93
  94 void
  95 omp_set_nest_lock (omp_nest_lock_t *lock)
  96 {
  97   pthread_mutex_lock (&lock->lock);
  98   lock->count++;
  99 }
 100
 101 void
 102 omp_unset_nest_lock (omp_nest_lock_t *lock)
 103 {
 104   lock->count--;
 105   pthread_mutex_unlock (&lock->lock);
 106 }
 107
 108 int
 109 omp_test_nest_lock (omp_nest_lock_t *lock)
 110 {
 111   if (pthread_mutex_trylock (&lock->lock) == 0)
 112     return ++lock->count;
 113   return 0;
 114 }
 115
 116 ialias (omp_init_lock)
 117 ialias (omp_init_nest_lock)
 118 ialias (omp_destroy_lock)
 119 ialias (omp_destroy_nest_lock)
 120 ialias (omp_set_lock)
 121 ialias (omp_set_nest_lock)
 122 ialias (omp_unset_lock)
 123 ialias (omp_unset_nest_lock)
 124 ialias (omp_test_lock)
 125 ialias (omp_test_nest_lock)