libobjc/thr-dce.c

   1 /* GNU Objective C Runtime Thread Interface
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under the
   8 terms of the GNU General Public License as published by the Free Software
   9 Foundation; either version 2, or (at your option) any later version.
  10
  11 GCC 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 General Public License for more
  14 details.
  15
  16 You should have received a copy of the GNU General Public License along with
  17 GCC; see the file COPYING.  If not, write to the Free Software
  18 Foundation, 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with files compiled with
  22    GCC to produce an executable, this does not cause the resulting executable
  23    to be covered by the GNU General Public License. This exception does not
  24    however invalidate any other reasons why the executable file might be
  25    covered by the GNU General Public License.  */
  26
  27 #include <pthread.h>
  28 #include "objc/thr.h"
  29 #include "objc/runtime.h"
  30
  31 /* Key structure for maintaining thread specific storage */
  32 static pthread_key_t _objc_thread_storage;
  33
  34 /* Backend initialization functions */
  35
  36 /* Initialize the threads subsystem. */
  37 int
  38 __objc_init_thread_system(void)
  39 {
  40   /* Initialize the thread storage key */
  41   return pthread_keycreate(&_objc_thread_storage, NULL);
  42 }
  43
  44 /* Close the threads subsystem. */
  45 int
  46 __objc_close_thread_system(void)
  47 {
  48   /* Destroy the thread storage key */
  49   /* Not implemented yet */
  50   /* return pthread_key_delete(&_objc_thread_storage); */
  51   return 0;
  52 }
  53
  54 /* Backend thread functions */
  55
  56 /* Create a new thread of execution. */
  57 objc_thread_t
  58 __objc_thread_detach(void (*func)(void *arg), void *arg)
  59 {
  60   objc_thread_t thread_id;
  61   pthread_t new_thread_handle;
  62
  63   if (pthread_create(&new_thread_handle, pthread_attr_default,
  64                      (void *)func, arg) == 0)
  65     {
  66       /* ??? May not work! (64bit) */
  67       thread_id = *(objc_thread_t *)&new_thread_handle;
  68       pthread_detach(&new_thread_handle);     /* Fully detach thread.     */
  69     }
  70   else
  71     thread_id = NULL;
  72
  73   return thread_id;
  74 }
  75
  76 /* Set the current thread's priority. */
  77 int
  78 __objc_thread_set_priority(int priority)
  79 {
  80   int sys_priority = 0;
  81
  82   switch (priority)
  83     {
  84     case OBJC_THREAD_INTERACTIVE_PRIORITY:
  85       sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
  86       break;
  87     default:
  88     case OBJC_THREAD_BACKGROUND_PRIORITY:
  89       sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
  90       break;
  91     case OBJC_THREAD_LOW_PRIORITY:
  92       sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
  93       break;
  94     }
  95
  96   /* Change the priority. */
  97   if (pthread_setprio(pthread_self(), sys_priority) >= 0)
  98     return 0;
  99   else
 100     /* Failed */
 101     return -1;
 102 }
 103
 104 /* Return the current thread's priority. */
 105 int
 106 __objc_thread_get_priority(void)
 107 {
 108   int sys_priority;
 109
 110   if ((sys_priority = pthread_getprio(pthread_self())) >= 0) {
 111     if (sys_priority >= PRI_FG_MIN_NP && sys_priority <= PRI_FG_MAX_NP)
 112       return OBJC_THREAD_INTERACTIVE_PRIORITY;
 113     if (sys_priority >= PRI_BG_MIN_NP && sys_priority <= PRI_BG_MAX_NP)
 114       return OBJC_THREAD_BACKGROUND_PRIORITY;
 115     return OBJC_THREAD_LOW_PRIORITY;
 116   }
 117
 118   /* Failed */
 119   return -1;
 120 }
 121
 122 /* Yield our process time to another thread. */
 123 void
 124 __objc_thread_yield(void)
 125 {
 126   pthread_yield();
 127 }
 128
 129 /* Terminate the current thread. */
 130 int
 131 __objc_thread_exit(void)
 132 {
 133   /* exit the thread */
 134   pthread_exit(&__objc_thread_exit_status);
 135
 136   /* Failed if we reached here */
 137   return -1;
 138 }
 139
 140 /* Returns an integer value which uniquely describes a thread. */
 141 objc_thread_t
 142 __objc_thread_id(void)
 143 {
 144   pthread_t self = pthread_self();
 145
 146   return (objc_thread_t) pthread_getunique_np (&self);
 147 }
 148
 149 /* Sets the thread's local storage pointer. */
 150 int
 151 __objc_thread_set_data(void *value)
 152 {
 153   return pthread_setspecific(_objc_thread_storage, value);
 154 }
 155
 156 /* Returns the thread's local storage pointer. */
 157 void *
 158 __objc_thread_get_data(void)
 159 {
 160   void *value = NULL;
 161
 162   if ( !(pthread_getspecific(_objc_thread_storage, &value)) )
 163     return value;
 164
 165   return NULL;
 166 }
 167
 168 /* Backend mutex functions */
 169
 170 /* Allocate a mutex. */
 171 int
 172 __objc_mutex_allocate(objc_mutex_t mutex)
 173 {
 174   if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)),
 175                          pthread_mutexattr_default))
 176     return -1;
 177   else
 178     return 0;
 179 }
 180
 181 /* Deallocate a mutex. */
 182 int
 183 __objc_mutex_deallocate(objc_mutex_t mutex)
 184 {
 185   if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))
 186     return -1;
 187   else
 188     return 0;
 189 }
 190
 191 /* Grab a lock on a mutex. */
 192 int
 193 __objc_mutex_lock(objc_mutex_t mutex)
 194 {
 195   return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));
 196 }
 197
 198 /* Try to grab a lock on a mutex. */
 199 int
 200 __objc_mutex_trylock(objc_mutex_t mutex)
 201 {
 202   if (pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend))) != 1)
 203     return -1;
 204   else
 205     return 0;
 206 }
 207
 208 /* Unlock the mutex */
 209 int
 210 __objc_mutex_unlock(objc_mutex_t mutex)
 211 {
 212   return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));
 213 }
 214
 215 /* Backend condition mutex functions */
 216
 217 /* Allocate a condition. */
 218 int
 219 __objc_condition_allocate(objc_condition_t condition)
 220 {
 221   /* Unimplemented. */
 222   return -1;
 223
 224   /*
 225   if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))
 226     return -1;
 227   else
 228     return 0;
 229     */
 230 }
 231
 232 /* Deallocate a condition. */
 233 int
 234 __objc_condition_deallocate(objc_condition_t condition)
 235 {
 236   /* Unimplemented. */
 237   return -1;
 238
 239   /*
 240   return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));
 241   */
 242 }
 243
 244 /* Wait on the condition */
 245 int
 246 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 247 {
 248   /* Unimplemented. */
 249   return -1;
 250
 251   /*
 252   return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),
 253                            (pthread_mutex_t *)(&(mutex->backend)));
 254                            */
 255 }
 256
 257 /* Wake up all threads waiting on this condition. */
 258 int
 259 __objc_condition_broadcast(objc_condition_t condition)
 260 {
 261   /* Unimplemented. */
 262   return -1;
 263
 264   /*
 265   return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));
 266   */
 267 }
 268
 269 /* Wake up one thread waiting on this condition. */
 270 int
 271 __objc_condition_signal(objc_condition_t condition)
 272 {
 273   /* Unimplemented. */
 274   return -1;
 275
 276   /*
 277   return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));
 278   */
 279 }
 280
 281 /* End of File */