libobjc/thr-pthreads.c

   1 /* GNU Objective C Runtime Thread Implementation for PCThreads under GNU/Linux.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    Contributed by Scott Christley <scottc@net-community.com>
   4    Condition functions added by: Mircea Oancea <mircea@first.elcom.pub.ro>
   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 <pcthread.h>
  29 #include <objc/thr.h>
  30 #include "runtime.h"
  31
  32 /* Key structure for maintaining 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   /* Destroy the thread storage key */
  50   /* Not implemented yet */
  51   /* return pthread_key_delete(&_objc_thread_storage); */
  52   return 0;
  53 }
  54
  55 /* Backend thread functions */
  56
  57 /* Create a new thread of execution. */
  58 objc_thread_t
  59 __objc_thread_detach(void (*func)(void *arg), void *arg)
  60 {
  61   objc_thread_t thread_id;
  62   pthread_t new_thread_handle;
  63
  64   if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) )
  65       thread_id = *(objc_thread_t *)&new_thread_handle;
  66   else
  67     thread_id = NULL;
  68
  69   return thread_id;
  70 }
  71
  72 /* Set the current thread's priority. */
  73 int
  74 __objc_thread_set_priority(int priority)
  75 {
  76   /* Not implemented yet */
  77   return -1;
  78 }
  79
  80 /* Return the current thread's priority. */
  81 int
  82 __objc_thread_get_priority(void)
  83 {
  84   /* Not implemented yet */
  85   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  86 }
  87
  88 /* Yield our process time to another thread. */
  89 void
  90 __objc_thread_yield(void)
  91 {
  92   pthread_yield(NULL);
  93 }
  94
  95 /* Terminate the current thread. */
  96 int
  97 __objc_thread_exit(void)
  98 {
  99   /* exit the thread */
 100   pthread_exit(&__objc_thread_exit_status);
 101
 102   /* Failed if we reached here */
 103   return -1;
 104 }
 105
 106 /* Returns an integer value which uniquely describes a thread. */
 107 objc_thread_t
 108 __objc_thread_id(void)
 109 {
 110   pthread_t self = pthread_self();
 111
 112   return *(objc_thread_t *)&self;
 113 }
 114
 115 /* Sets the thread's local storage pointer. */
 116 int
 117 __objc_thread_set_data(void *value)
 118 {
 119   return pthread_setspecific(_objc_thread_storage, value);
 120 }
 121
 122 /* Returns the thread's local storage pointer. */
 123 void *
 124 __objc_thread_get_data(void)
 125 {
 126   void *value = NULL;
 127
 128   if ( !(pthread_getspecific(_objc_thread_storage, &value)) )
 129     return value;
 130
 131   return NULL;
 132 }
 133
 134 /* Backend mutex functions */
 135
 136 /* Allocate a mutex. */
 137 int
 138 __objc_mutex_allocate(objc_mutex_t mutex)
 139 {
 140   if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)), NULL))
 141     return -1;
 142   else
 143     return 0;
 144 }
 145
 146 /* Deallocate a mutex. */
 147 int
 148 __objc_mutex_deallocate(objc_mutex_t mutex)
 149 {
 150   if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))
 151     return -1;
 152   else
 153     return 0;
 154 }
 155
 156 /* Grab a lock on a mutex. */
 157 int
 158 __objc_mutex_lock(objc_mutex_t mutex)
 159 {
 160   return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));
 161 }
 162
 163 /* Try to grab a lock on a mutex. */
 164 int
 165 __objc_mutex_trylock(objc_mutex_t mutex)
 166 {
 167   return pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend)));
 168 }
 169
 170 /* Unlock the mutex */
 171 int
 172 __objc_mutex_unlock(objc_mutex_t mutex)
 173 {
 174   return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));
 175 }
 176
 177 /* Backend condition mutex functions */
 178
 179 /* Allocate a condition. */
 180 int
 181 __objc_condition_allocate(objc_condition_t condition)
 182 {
 183   if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))
 184     return -1;
 185   else
 186     return 0;
 187 }
 188
 189 /* Deallocate a condition. */
 190 int
 191 __objc_condition_deallocate(objc_condition_t condition)
 192 {
 193   return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));
 194 }
 195
 196 /* Wait on the condition */
 197 int
 198 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 199 {
 200   return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),
 201                            (pthread_mutex_t *)(&(mutex->backend)));
 202 }
 203
 204 /* Wake up all threads waiting on this condition. */
 205 int
 206 __objc_condition_broadcast(objc_condition_t condition)
 207 {
 208   return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));
 209 }
 210
 211 /* Wake up one thread waiting on this condition. */
 212 int
 213 __objc_condition_signal(objc_condition_t condition)
 214 {
 215   return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));
 216 }
 217
 218 /* End of File */