libgomp/config/posix/lock.c

   1 /* Copyright (C) 2005-2018 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 PTHREADS implementation of the public OpenMP
  27    locking primitives.
  28
  29    Because OpenMP uses different entry points for normal and recursive
  30    locks, and pthreads uses only one entry point, a system may be able
  31    to do better and streamline the locking as well as reduce the size
  32    of the types exported.  */
  33
  34 /* We need UNIX98/XPG5 extensions to get recursive locks.  Request XPG6 since
  35    Solaris requires this for C99 and later.  */
  36 #define _XOPEN_SOURCE 600
  37
  38 #include "libgomp.h"
  39
  40 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  41 void
  42 gomp_init_lock_30 (omp_lock_t *lock)
  43 {
  44   pthread_mutex_init (lock, NULL);
  45 }
  46
  47 void
  48 gomp_destroy_lock_30 (omp_lock_t *lock)
  49 {
  50   pthread_mutex_destroy (lock);
  51 }
  52
  53 void
  54 gomp_set_lock_30 (omp_lock_t *lock)
  55 {
  56   pthread_mutex_lock (lock);
  57 }
  58
  59 void
  60 gomp_unset_lock_30 (omp_lock_t *lock)
  61 {
  62   pthread_mutex_unlock (lock);
  63 }
  64
  65 int
  66 gomp_test_lock_30 (omp_lock_t *lock)
  67 {
  68   return pthread_mutex_trylock (lock) == 0;
  69 }
  70
  71 void
  72 gomp_init_nest_lock_30 (omp_nest_lock_t *lock)
  73 {
  74   pthread_mutex_init (&lock->lock, NULL);
  75   lock->count = 0;
  76   lock->owner = NULL;
  77 }
  78
  79 void
  80 gomp_destroy_nest_lock_30 (omp_nest_lock_t *lock)
  81 {
  82   pthread_mutex_destroy (&lock->lock);
  83 }
  84
  85 void
  86 gomp_set_nest_lock_30 (omp_nest_lock_t *lock)
  87 {
  88   void *me = gomp_icv (true);
  89
  90   if (lock->owner != me)
  91     {
  92       pthread_mutex_lock (&lock->lock);
  93       lock->owner = me;
  94     }
  95   lock->count++;
  96 }
  97
  98 void
  99 gomp_unset_nest_lock_30 (omp_nest_lock_t *lock)
 100 {
 101   if (--lock->count == 0)
 102     {
 103       lock->owner = NULL;
 104       pthread_mutex_unlock (&lock->lock);
 105     }
 106 }
 107
 108 int
 109 gomp_test_nest_lock_30 (omp_nest_lock_t *lock)
 110 {
 111   void *me = gomp_icv (true);
 112
 113   if (lock->owner != me)
 114     {
 115       if (pthread_mutex_trylock (&lock->lock) != 0)
 116         return 0;
 117       lock->owner = me;
 118     }
 119
 120   return ++lock->count;
 121 }
 122
 123 #else
 124
 125 void
 126 gomp_init_lock_30 (omp_lock_t *lock)
 127 {
 128   sem_init (lock, 0, 1);
 129 }
 130
 131 void
 132 gomp_destroy_lock_30 (omp_lock_t *lock)
 133 {
 134   sem_destroy (lock);
 135 }
 136
 137 void
 138 gomp_set_lock_30 (omp_lock_t *lock)
 139 {
 140   while (sem_wait (lock) != 0)
 141     ;
 142 }
 143
 144 void
 145 gomp_unset_lock_30 (omp_lock_t *lock)
 146 {
 147   sem_post (lock);
 148 }
 149
 150 int
 151 gomp_test_lock_30 (omp_lock_t *lock)
 152 {
 153   return sem_trywait (lock) == 0;
 154 }
 155
 156 void
 157 gomp_init_nest_lock_30 (omp_nest_lock_t *lock)
 158 {
 159   sem_init (&lock->lock, 0, 1);
 160   lock->count = 0;
 161   lock->owner = NULL;
 162 }
 163
 164 void
 165 gomp_destroy_nest_lock_30 (omp_nest_lock_t *lock)
 166 {
 167   sem_destroy (&lock->lock);
 168 }
 169
 170 void
 171 gomp_set_nest_lock_30 (omp_nest_lock_t *lock)
 172 {
 173   void *me = gomp_icv (true);
 174
 175   if (lock->owner != me)
 176     {
 177       while (sem_wait (&lock->lock) != 0)
 178         ;
 179       lock->owner = me;
 180     }
 181   lock->count++;
 182 }
 183
 184 void
 185 gomp_unset_nest_lock_30 (omp_nest_lock_t *lock)
 186 {
 187   if (--lock->count == 0)
 188     {
 189       lock->owner = NULL;
 190       sem_post (&lock->lock);
 191     }
 192 }
 193
 194 int
 195 gomp_test_nest_lock_30 (omp_nest_lock_t *lock)
 196 {
 197   void *me = gomp_icv (true);
 198
 199   if (lock->owner != me)
 200     {
 201       if (sem_trywait (&lock->lock) != 0)
 202         return 0;
 203       lock->owner = me;
 204     }
 205
 206   return ++lock->count;
 207 }
 208 #endif
 209
 210 #ifdef LIBGOMP_GNU_SYMBOL_VERSIONING
 211 void
 212 gomp_init_lock_25 (omp_lock_25_t *lock)
 213 {
 214   pthread_mutex_init (lock, NULL);
 215 }
 216
 217 void
 218 gomp_destroy_lock_25 (omp_lock_25_t *lock)
 219 {
 220   pthread_mutex_destroy (lock);
 221 }
 222
 223 void
 224 gomp_set_lock_25 (omp_lock_25_t *lock)
 225 {
 226   pthread_mutex_lock (lock);
 227 }
 228
 229 void
 230 gomp_unset_lock_25 (omp_lock_25_t *lock)
 231 {
 232   pthread_mutex_unlock (lock);
 233 }
 234
 235 int
 236 gomp_test_lock_25 (omp_lock_25_t *lock)
 237 {
 238   return pthread_mutex_trylock (lock) == 0;
 239 }
 240
 241 void
 242 gomp_init_nest_lock_25 (omp_nest_lock_25_t *lock)
 243 {
 244   pthread_mutexattr_t attr;
 245
 246   pthread_mutexattr_init (&attr);
 247   pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
 248   pthread_mutex_init (&lock->lock, &attr);
 249   lock->count = 0;
 250   pthread_mutexattr_destroy (&attr);
 251 }
 252
 253 void
 254 gomp_destroy_nest_lock_25 (omp_nest_lock_25_t *lock)
 255 {
 256   pthread_mutex_destroy (&lock->lock);
 257 }
 258
 259 void
 260 gomp_set_nest_lock_25 (omp_nest_lock_25_t *lock)
 261 {
 262   pthread_mutex_lock (&lock->lock);
 263   lock->count++;
 264 }
 265
 266 void
 267 gomp_unset_nest_lock_25 (omp_nest_lock_25_t *lock)
 268 {
 269   lock->count--;
 270   pthread_mutex_unlock (&lock->lock);
 271 }
 272
 273 int
 274 gomp_test_nest_lock_25 (omp_nest_lock_25_t *lock)
 275 {
 276   if (pthread_mutex_trylock (&lock->lock) == 0)
 277     return ++lock->count;
 278   return 0;
 279 }
 280
 281 omp_lock_symver (omp_init_lock)
 282 omp_lock_symver (omp_destroy_lock)
 283 omp_lock_symver (omp_set_lock)
 284 omp_lock_symver (omp_unset_lock)
 285 omp_lock_symver (omp_test_lock)
 286 omp_lock_symver (omp_init_nest_lock)
 287 omp_lock_symver (omp_destroy_nest_lock)
 288 omp_lock_symver (omp_set_nest_lock)
 289 omp_lock_symver (omp_unset_nest_lock)
 290 omp_lock_symver (omp_test_nest_lock)
 291
 292 #else
 293
 294 ialias (omp_init_lock)
 295 ialias (omp_init_nest_lock)
 296 ialias (omp_destroy_lock)
 297 ialias (omp_destroy_nest_lock)
 298 ialias (omp_set_lock)
 299 ialias (omp_set_nest_lock)
 300 ialias (omp_unset_lock)
 301 ialias (omp_unset_nest_lock)
 302 ialias (omp_test_lock)
 303 ialias (omp_test_nest_lock)
 304
 305 #endif