libgomp/config/posix/lock.c

   1 /* Copyright (C) 2005, 2008 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 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  46 void
  47 gomp_init_lock_30 (omp_lock_t *lock)
  48 {
  49   pthread_mutex_init (lock, NULL);
  50 }
  51
  52 void
  53 gomp_destroy_lock_30 (omp_lock_t *lock)
  54 {
  55   pthread_mutex_destroy (lock);
  56 }
  57
  58 void
  59 gomp_set_lock_30 (omp_lock_t *lock)
  60 {
  61   pthread_mutex_lock (lock);
  62 }
  63
  64 void
  65 gomp_unset_lock_30 (omp_lock_t *lock)
  66 {
  67   pthread_mutex_unlock (lock);
  68 }
  69
  70 int
  71 gomp_test_lock_30 (omp_lock_t *lock)
  72 {
  73   return pthread_mutex_trylock (lock) == 0;
  74 }
  75
  76 void
  77 gomp_init_nest_lock_30 (omp_nest_lock_t *lock)
  78 {
  79   pthread_mutex_init (&lock->lock, NULL);
  80   lock->count = 0;
  81   lock->owner = NULL;
  82 }
  83
  84 void
  85 gomp_destroy_nest_lock_30 (omp_nest_lock_t *lock)
  86 {
  87   pthread_mutex_destroy (&lock->lock);
  88 }
  89
  90 void
  91 gomp_set_nest_lock_30 (omp_nest_lock_t *lock)
  92 {
  93   void *me = gomp_icv (true);
  94
  95   if (lock->owner != me)
  96     {
  97       pthread_mutex_lock (&lock->lock);
  98       lock->owner = me;
  99     }
 100   lock->count++;
 101 }
 102
 103 void
 104 gomp_unset_nest_lock_30 (omp_nest_lock_t *lock)
 105 {
 106   if (--lock->count == 0)
 107     {
 108       lock->owner = NULL;
 109       pthread_mutex_unlock (&lock->lock);
 110     }
 111 }
 112
 113 int
 114 gomp_test_nest_lock_30 (omp_nest_lock_t *lock)
 115 {
 116   void *me = gomp_icv (true);
 117
 118   if (lock->owner != me)
 119     {
 120       if (pthread_mutex_trylock (&lock->lock) != 0)
 121         return 0;
 122       lock->owner = me;
 123     }
 124
 125   return ++lock->count;
 126 }
 127
 128 #else
 129
 130 void
 131 gomp_init_lock_30 (omp_lock_t *lock)
 132 {
 133   sem_init (lock, 0, 1);
 134 }
 135
 136 void
 137 gomp_destroy_lock_30 (omp_lock_t *lock)
 138 {
 139   sem_destroy (lock);
 140 }
 141
 142 void
 143 gomp_set_lock_30 (omp_lock_t *lock)
 144 {
 145   while (sem_wait (lock) != 0)
 146     ;
 147 }
 148
 149 void
 150 gomp_unset_lock_30 (omp_lock_t *lock)
 151 {
 152   sem_post (lock);
 153 }
 154
 155 int
 156 gomp_test_lock_30 (omp_lock_t *lock)
 157 {
 158   return sem_trywait (lock) == 0;
 159 }
 160
 161 void
 162 gomp_init_nest_lock_30 (omp_nest_lock_t *lock)
 163 {
 164   sem_init (&lock->lock, 0, 1);
 165   lock->count = 0;
 166   lock->owner = NULL;
 167 }
 168
 169 void
 170 gomp_destroy_nest_lock_30 (omp_nest_lock_t *lock)
 171 {
 172   sem_destroy (&lock->lock);
 173 }
 174
 175 void
 176 gomp_set_nest_lock_30 (omp_nest_lock_t *lock)
 177 {
 178   void *me = gomp_icv (true);
 179
 180   if (lock->owner != me)
 181     {
 182       while (sem_wait (&lock->lock) != 0)
 183         ;
 184       lock->owner = me;
 185     }
 186   lock->count++;
 187 }
 188
 189 void
 190 gomp_unset_nest_lock_30 (omp_nest_lock_t *lock)
 191 {
 192   if (--lock->count == 0)
 193     {
 194       lock->owner = NULL;
 195       sem_post (&lock->lock);
 196     }
 197 }
 198
 199 int
 200 gomp_test_nest_lock_30 (omp_nest_lock_t *lock)
 201 {
 202   void *me = gomp_icv (true);
 203
 204   if (lock->owner != me)
 205     {
 206       if (sem_trywait (&lock->lock) != 0)
 207         return 0;
 208       lock->owner = me;
 209     }
 210
 211   return ++lock->count;
 212 }
 213 #endif
 214
 215 #ifdef LIBGOMP_GNU_SYMBOL_VERSIONING
 216 void
 217 gomp_init_lock_25 (omp_lock_25_t *lock)
 218 {
 219   pthread_mutex_init (lock, NULL);
 220 }
 221
 222 void
 223 gomp_destroy_lock_25 (omp_lock_25_t *lock)
 224 {
 225   pthread_mutex_destroy (lock);
 226 }
 227
 228 void
 229 gomp_set_lock_25 (omp_lock_25_t *lock)
 230 {
 231   pthread_mutex_lock (lock);
 232 }
 233
 234 void
 235 gomp_unset_lock_25 (omp_lock_25_t *lock)
 236 {
 237   pthread_mutex_unlock (lock);
 238 }
 239
 240 int
 241 gomp_test_lock_25 (omp_lock_25_t *lock)
 242 {
 243   return pthread_mutex_trylock (lock) == 0;
 244 }
 245
 246 void
 247 gomp_init_nest_lock_25 (omp_nest_lock_25_t *lock)
 248 {
 249   pthread_mutexattr_t attr;
 250
 251   pthread_mutexattr_init (&attr);
 252   pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
 253   pthread_mutex_init (&lock->lock, &attr);
 254   lock->count = 0;
 255   pthread_mutexattr_destroy (&attr);
 256 }
 257
 258 void
 259 gomp_destroy_nest_lock_25 (omp_nest_lock_25_t *lock)
 260 {
 261   pthread_mutex_destroy (&lock->lock);
 262 }
 263
 264 void
 265 gomp_set_nest_lock_25 (omp_nest_lock_25_t *lock)
 266 {
 267   pthread_mutex_lock (&lock->lock);
 268   lock->count++;
 269 }
 270
 271 void
 272 gomp_unset_nest_lock_25 (omp_nest_lock_25_t *lock)
 273 {
 274   lock->count--;
 275   pthread_mutex_unlock (&lock->lock);
 276 }
 277
 278 int
 279 gomp_test_nest_lock_25 (omp_nest_lock_25_t *lock)
 280 {
 281   if (pthread_mutex_trylock (&lock->lock) == 0)
 282     return ++lock->count;
 283   return 0;
 284 }
 285
 286 omp_lock_symver (omp_init_lock)
 287 omp_lock_symver (omp_destroy_lock)
 288 omp_lock_symver (omp_set_lock)
 289 omp_lock_symver (omp_unset_lock)
 290 omp_lock_symver (omp_test_lock)
 291 omp_lock_symver (omp_init_nest_lock)
 292 omp_lock_symver (omp_destroy_nest_lock)
 293 omp_lock_symver (omp_set_nest_lock)
 294 omp_lock_symver (omp_unset_nest_lock)
 295 omp_lock_symver (omp_test_nest_lock)
 296
 297 #else
 298
 299 ialias (omp_init_lock)
 300 ialias (omp_init_nest_lock)
 301 ialias (omp_destroy_lock)
 302 ialias (omp_destroy_nest_lock)
 303 ialias (omp_set_lock)
 304 ialias (omp_set_nest_lock)
 305 ialias (omp_unset_lock)
 306 ialias (omp_unset_nest_lock)
 307 ialias (omp_test_lock)
 308 ialias (omp_test_nest_lock)
 309
 310 #endif