gcc/objc/thr-posix.c

   1 /* GNU Objective C Runtime Thread Interface for POSIX compliant threads
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
   4    Modified for Linux/Pthreads by Kai-Uwe Sattler (kus@iti.cs.uni-magdeburg.de)
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify it under the
   9 terms of the GNU General Public License as published by the Free Software
  10 Foundation; either version 2, or (at your option) any later version.
  11
  12 GNU CC 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 more
  15 details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with files compiled with
  23    GCC to produce an executable, this does not cause the resulting executable
  24    to be covered by the GNU General Public License. This exception does not
  25    however invalidate any other reasons why the executable file might be
  26    covered by the GNU General Public License.  */
  27
  28 #include <objc/thr.h>
  29 #include "runtime.h"
  30 #include <pthread.h>
  31
  32 /* Key structure for maintiain thread specific storage */
  33 static pthread_key_t _objc_thread_storage;
  34
  35 /* Backend initialization functions */
  36
  37 /* Initialize the threads subsystem. */
  38 int
  39 __objc_init_thread_system(void)
  40 {
  41   /* Initialize the thread storage key */
  42   return pthread_key_create(&_objc_thread_storage, NULL);
  43 }
  44
  45 /* Close the threads subsystem. */
  46 int
  47 __objc_close_thread_system(void)
  48 {
  49   return 0;
  50 }
  51
  52 /* Backend thread functions */
  53
  54 /* Create a new thread of execution. */
  55 objc_thread_t
  56 __objc_thread_detach(void (*func)(void *arg), void *arg)
  57 {
  58   objc_thread_t thread_id;
  59   pthread_t new_thread_handle;
  60
  61   if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) )
  62       thread_id = *(objc_thread_t *)&new_thread_handle;
  63   else
  64     thread_id = NULL;
  65
  66   return thread_id;
  67 }
  68
  69 /* Set the current thread's priority. */
  70 int
  71 __objc_thread_set_priority(int priority)
  72 {
  73   /* Not implemented yet */
  74   return -1;
  75 }
  76
  77 /* Return the current thread's priority. */
  78 int
  79 __objc_thread_get_priority(void)
  80 {
  81   /* Not implemented yet */
  82   return -1;
  83 }
  84
  85 /* Yield our process time to another thread. */
  86 void
  87 __objc_thread_yield(void)
  88 {
  89   sched_yield();
  90 }
  91
  92 /* Terminate the current thread. */
  93 int
  94 __objc_thread_exit(void)
  95 {
  96   /* exit the thread */
  97   pthread_exit(&__objc_thread_exit_status);
  98
  99   /* Failed if we reached here */
 100   return -1;
 101 }
 102
 103 /* Returns an integer value which uniquely describes a thread. */
 104 objc_thread_t
 105 __objc_thread_id(void)
 106 {
 107   pthread_t self = pthread_self();
 108
 109   return *(objc_thread_t *)&self;
 110 }
 111
 112 /* Sets the thread's local storage pointer. */
 113 int
 114 __objc_thread_set_data(void *value)
 115 {
 116   return pthread_setspecific(_objc_thread_storage, value);
 117 }
 118
 119 /* Returns the thread's local storage pointer. */
 120 void *
 121 __objc_thread_get_data(void)
 122 {
 123   return pthread_getspecific(_objc_thread_storage);
 124 }
 125
 126 /* Backend mutex functions */
 127
 128 /* Allocate a mutex. */
 129 int
 130 __objc_mutex_allocate(objc_mutex_t mutex)
 131 {
 132   if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)), NULL))
 133     return -1;
 134   else
 135     return 0;
 136 }
 137
 138 /* Deallocate a mutex. */
 139 int
 140 __objc_mutex_deallocate(objc_mutex_t mutex)
 141 {
 142   if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))
 143     return -1;
 144   else
 145     return 0;
 146 }
 147
 148 /* Grab a lock on a mutex. */
 149 int
 150 __objc_mutex_lock(objc_mutex_t mutex)
 151 {
 152   return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));
 153 }
 154
 155 /* Try to grab a lock on a mutex. */
 156 int
 157 __objc_mutex_trylock(objc_mutex_t mutex)
 158 {
 159   return pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend)));
 160 }
 161
 162 /* Unlock the mutex */
 163 int
 164 __objc_mutex_unlock(objc_mutex_t mutex)
 165 {
 166   return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));
 167 }
 168
 169 /* Backend condition mutex functions */
 170
 171 /* Allocate a condition. */
 172 int
 173 __objc_condition_allocate(objc_condition_t condition)
 174 {
 175   if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))
 176     return -1;
 177   else
 178     return 0;
 179 }
 180
 181 /* Deallocate a condition. */
 182 int
 183 __objc_condition_deallocate(objc_condition_t condition)
 184 {
 185   return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));
 186 }
 187
 188 /* Wait on the condition */
 189 int
 190 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 191 {
 192   return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),
 193                            (pthread_mutex_t *)(&(mutex->backend)));
 194 }
 195
 196 /* Wake up all threads waiting on this condition. */
 197 int
 198 __objc_condition_broadcast(objc_condition_t condition)
 199 {
 200   return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));
 201 }
 202
 203 /* Wake up one thread waiting on this condition. */
 204 int
 205 __objc_condition_signal(objc_condition_t condition)
 206 {
 207   return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));
 208 }
 209
 210 /* End of File */