libobjc/thr-single.c

   1 /* GNU Objective C Runtime Thread Implementation
   2    Copyright (C) 1996, 1997, 2009 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 3, 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 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25
  26 #include "objc/thr.h"
  27 #include "objc/runtime.h"
  28
  29 /* Thread local storage for a single thread */
  30 static void *thread_local_storage = NULL;
  31
  32 /* Backend initialization functions */
  33
  34 /* Initialize the threads subsystem. */
  35 int
  36 __objc_init_thread_system(void)
  37 {
  38   /* No thread support available */
  39   return -1;
  40 }
  41
  42 /* Close the threads subsystem. */
  43 int
  44 __objc_close_thread_system(void)
  45 {
  46   /* No thread support available */
  47   return -1;
  48 }
  49
  50 /* Backend thread functions */
  51
  52 /* Create a new thread of execution. */
  53 objc_thread_t
  54 __objc_thread_detach(void (*func)(void *arg), void *arg)
  55 {
  56   /* No thread support available */
  57   return NULL;
  58 }
  59
  60 /* Set the current thread's priority. */
  61 int
  62 __objc_thread_set_priority(int priority)
  63 {
  64   /* No thread support available */
  65   return -1;
  66 }
  67
  68 /* Return the current thread's priority. */
  69 int
  70 __objc_thread_get_priority(void)
  71 {
  72   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  73 }
  74
  75 /* Yield our process time to another thread. */
  76 void
  77 __objc_thread_yield(void)
  78 {
  79   return;
  80 }
  81
  82 /* Terminate the current thread. */
  83 int
  84 __objc_thread_exit(void)
  85 {
  86   /* No thread support available */
  87   /* Should we really exit the program */
  88   /* exit(&__objc_thread_exit_status); */
  89   return -1;
  90 }
  91
  92 /* Returns an integer value which uniquely describes a thread. */
  93 objc_thread_t
  94 __objc_thread_id(void)
  95 {
  96   /* No thread support, use 1. */
  97   return (objc_thread_t)1;
  98 }
  99
 100 /* Sets the thread's local storage pointer. */
 101 int
 102 __objc_thread_set_data(void *value)
 103 {
 104   thread_local_storage = value;
 105   return 0;
 106 }
 107
 108 /* Returns the thread's local storage pointer. */
 109 void *
 110 __objc_thread_get_data(void)
 111 {
 112   return thread_local_storage;
 113 }
 114
 115 /* Backend mutex functions */
 116
 117 /* Allocate a mutex. */
 118 int
 119 __objc_mutex_allocate(objc_mutex_t mutex)
 120 {
 121   return 0;
 122 }
 123
 124 /* Deallocate a mutex. */
 125 int
 126 __objc_mutex_deallocate(objc_mutex_t mutex)
 127 {
 128   return 0;
 129 }
 130
 131 /* Grab a lock on a mutex. */
 132 int
 133 __objc_mutex_lock(objc_mutex_t mutex)
 134 {
 135   /* There can only be one thread, so we always get the lock */
 136   return 0;
 137 }
 138
 139 /* Try to grab a lock on a mutex. */
 140 int
 141 __objc_mutex_trylock(objc_mutex_t mutex)
 142 {
 143   /* There can only be one thread, so we always get the lock */
 144   return 0;
 145 }
 146
 147 /* Unlock the mutex */
 148 int
 149 __objc_mutex_unlock(objc_mutex_t mutex)
 150 {
 151   return 0;
 152 }
 153
 154 /* Backend condition mutex functions */
 155
 156 /* Allocate a condition. */
 157 int
 158 __objc_condition_allocate(objc_condition_t condition)
 159 {
 160   return 0;
 161 }
 162
 163 /* Deallocate a condition. */
 164 int
 165 __objc_condition_deallocate(objc_condition_t condition)
 166 {
 167   return 0;
 168 }
 169
 170 /* Wait on the condition */
 171 int
 172 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 173 {
 174   return 0;
 175 }
 176
 177 /* Wake up all threads waiting on this condition. */
 178 int
 179 __objc_condition_broadcast(objc_condition_t condition)
 180 {
 181   return 0;
 182 }
 183
 184 /* Wake up one thread waiting on this condition. */
 185 int
 186 __objc_condition_signal(objc_condition_t condition)
 187 {
 188   return 0;
 189 }
 190
 191 /* End of File */