libobjc/thr-single.c

   1 /* GNU Objective C Runtime Thread Implementation
   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, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, 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 <objc/thr.h>
  28 #include "runtime.h"
  29
  30 /* Thread local storage for a single thread */
  31 static void *thread_local_storage = NULL;
  32
  33 /* Backend initialization functions */
  34
  35 /* Initialize the threads subsystem. */
  36 int
  37 __objc_init_thread_system(void)
  38 {
  39   /* No thread support available */
  40   return -1;
  41 }
  42
  43 /* Close the threads subsystem. */
  44 int
  45 __objc_close_thread_system(void)
  46 {
  47   /* No thread support available */
  48   return -1;
  49 }
  50
  51 /* Backend thread functions */
  52
  53 /* Create a new thread of execution. */
  54 objc_thread_t
  55 __objc_thread_detach(void (*func)(void *arg), void *arg)
  56 {
  57   /* No thread support available */
  58   return NULL;
  59 }
  60
  61 /* Set the current thread's priority. */
  62 int
  63 __objc_thread_set_priority(int priority)
  64 {
  65   /* No thread support available */
  66   return -1;
  67 }
  68
  69 /* Return the current thread's priority. */
  70 int
  71 __objc_thread_get_priority(void)
  72 {
  73   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  74 }
  75
  76 /* Yield our process time to another thread. */
  77 void
  78 __objc_thread_yield(void)
  79 {
  80   return;
  81 }
  82
  83 /* Terminate the current thread. */
  84 int
  85 __objc_thread_exit(void)
  86 {
  87   /* No thread support available */
  88   /* Should we really exit the program */
  89   /* exit(&__objc_thread_exit_status); */
  90   return -1;
  91 }
  92
  93 /* Returns an integer value which uniquely describes a thread. */
  94 objc_thread_t
  95 __objc_thread_id(void)
  96 {
  97   /* No thread support, use 1. */
  98   return (objc_thread_t)1;
  99 }
 100
 101 /* Sets the thread's local storage pointer. */
 102 int
 103 __objc_thread_set_data(void *value)
 104 {
 105   thread_local_storage = value;
 106   return 0;
 107 }
 108
 109 /* Returns the thread's local storage pointer. */
 110 void *
 111 __objc_thread_get_data(void)
 112 {
 113   return thread_local_storage;
 114 }
 115
 116 /* Backend mutex functions */
 117
 118 /* Allocate a mutex. */
 119 int
 120 __objc_mutex_allocate(objc_mutex_t mutex)
 121 {
 122   return 0;
 123 }
 124
 125 /* Deallocate a mutex. */
 126 int
 127 __objc_mutex_deallocate(objc_mutex_t mutex)
 128 {
 129   return 0;
 130 }
 131
 132 /* Grab a lock on a mutex. */
 133 int
 134 __objc_mutex_lock(objc_mutex_t mutex)
 135 {
 136   /* There can only be one thread, so we always get the lock */
 137   return 0;
 138 }
 139
 140 /* Try to grab a lock on a mutex. */
 141 int
 142 __objc_mutex_trylock(objc_mutex_t mutex)
 143 {
 144   /* There can only be one thread, so we always get the lock */
 145   return 0;
 146 }
 147
 148 /* Unlock the mutex */
 149 int
 150 __objc_mutex_unlock(objc_mutex_t mutex)
 151 {
 152   return 0;
 153 }
 154
 155 /* Backend condition mutex functions */
 156
 157 /* Allocate a condition. */
 158 int
 159 __objc_condition_allocate(objc_condition_t condition)
 160 {
 161   return 0;
 162 }
 163
 164 /* Deallocate a condition. */
 165 int
 166 __objc_condition_deallocate(objc_condition_t condition)
 167 {
 168   return 0;
 169 }
 170
 171 /* Wait on the condition */
 172 int
 173 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 174 {
 175   return 0;
 176 }
 177
 178 /* Wake up all threads waiting on this condition. */
 179 int
 180 __objc_condition_broadcast(objc_condition_t condition)
 181 {
 182   return 0;
 183 }
 184
 185 /* Wake up one thread waiting on this condition. */
 186 int
 187 __objc_condition_signal(objc_condition_t condition)
 188 {
 189   return 0;
 190 }
 191
 192 /* End of File */