gcc/gthr-single.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more 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 other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #ifndef __gthr_single_h
  30 #define __gthr_single_h
  31
  32 /* Just provide compatibility for mutex handling. */
  33
  34 typedef int __gthread_mutex_t;
  35
  36 #define __GTHREAD_MUTEX_INIT 0
  37
  38 #ifdef _LIBOBJC
  39
  40 /* Thread local storage for a single thread */
  41 static void *thread_local_storage = NULL;
  42
  43 /* Backend initialization functions */
  44
  45 /* Initialize the threads subsystem. */
  46 static inline int
  47 __gthread_objc_init_thread_system(void)
  48 {
  49   /* No thread support available */
  50   return -1;
  51 }
  52
  53 /* Close the threads subsystem. */
  54 static inline int
  55 __gthread_objc_close_thread_system(void)
  56 {
  57   /* No thread support available */
  58   return -1;
  59 }
  60
  61 /* Backend thread functions */
  62
  63 /* Create a new thread of execution. */
  64 static inline objc_thread_t
  65 __gthread_objc_thread_detach(void (*func)(void *arg), void *arg)
  66 {
  67   /* No thread support available */
  68   return NULL;
  69 }
  70
  71 /* Set the current thread's priority. */
  72 static inline int
  73 __gthread_objc_thread_set_priority(int priority)
  74 {
  75   /* No thread support available */
  76   return -1;
  77 }
  78
  79 /* Return the current thread's priority. */
  80 static inline int
  81 __gthread_objc_thread_get_priority(void)
  82 {
  83   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  84 }
  85
  86 /* Yield our process time to another thread. */
  87 static inline void
  88 __gthread_objc_thread_yield(void)
  89 {
  90   return;
  91 }
  92
  93 /* Terminate the current thread. */
  94 static inline int
  95 __gthread_objc_thread_exit(void)
  96 {
  97   /* No thread support available */
  98   /* Should we really exit the program */
  99   /* exit(&__objc_thread_exit_status); */
 100   return -1;
 101 }
 102
 103 /* Returns an integer value which uniquely describes a thread. */
 104 static inline objc_thread_t
 105 __gthread_objc_thread_id(void)
 106 {
 107   /* No thread support, use 1. */
 108   return (objc_thread_t)1;
 109 }
 110
 111 /* Sets the thread's local storage pointer. */
 112 static inline int
 113 __gthread_objc_thread_set_data(void *value)
 114 {
 115   thread_local_storage = value;
 116   return 0;
 117 }
 118
 119 /* Returns the thread's local storage pointer. */
 120 static inline void *
 121 __gthread_objc_thread_get_data(void)
 122 {
 123   return thread_local_storage;
 124 }
 125
 126 /* Backend mutex functions */
 127
 128 /* Allocate a mutex. */
 129 static inline int
 130 __gthread_objc_mutex_allocate(objc_mutex_t mutex)
 131 {
 132   return 0;
 133 }
 134
 135 /* Deallocate a mutex. */
 136 static inline int
 137 __gthread_objc_mutex_deallocate(objc_mutex_t mutex)
 138 {
 139   return 0;
 140 }
 141
 142 /* Grab a lock on a mutex. */
 143 static inline int
 144 __gthread_objc_mutex_lock(objc_mutex_t mutex)
 145 {
 146   /* There can only be one thread, so we always get the lock */
 147   return 0;
 148 }
 149
 150 /* Try to grab a lock on a mutex. */
 151 static inline int
 152 __gthread_objc_mutex_trylock(objc_mutex_t mutex)
 153 {
 154   /* There can only be one thread, so we always get the lock */
 155   return 0;
 156 }
 157
 158 /* Unlock the mutex */
 159 static inline int
 160 __gthread_objc_mutex_unlock(objc_mutex_t mutex)
 161 {
 162   return 0;
 163 }
 164
 165 /* Backend condition mutex functions */
 166
 167 /* Allocate a condition. */
 168 static inline int
 169 __gthread_objc_condition_allocate(objc_condition_t condition)
 170 {
 171   return 0;
 172 }
 173
 174 /* Deallocate a condition. */
 175 static inline int
 176 __gthread_objc_condition_deallocate(objc_condition_t condition)
 177 {
 178   return 0;
 179 }
 180
 181 /* Wait on the condition */
 182 static inline int
 183 __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 184 {
 185   return 0;
 186 }
 187
 188 /* Wake up all threads waiting on this condition. */
 189 static inline int
 190 __gthread_objc_condition_broadcast(objc_condition_t condition)
 191 {
 192   return 0;
 193 }
 194
 195 /* Wake up one thread waiting on this condition. */
 196 static inline int
 197 __gthread_objc_condition_signal(objc_condition_t condition)
 198 {
 199   return 0;
 200 }
 201
 202 #else /* _LIBOBJC */
 203
 204 static inline int
 205 __gthread_active_p (void)
 206 {
 207   return 0;
 208 }
 209
 210 static inline int
 211 __gthread_mutex_lock (__gthread_mutex_t *mutex __attribute__ ((__unused__)))
 212 {
 213   return 0;
 214 }
 215
 216 static inline int
 217 __gthread_mutex_trylock (__gthread_mutex_t *mutex __attribute__ ((__unused__)))
 218 {
 219   return 0;
 220 }
 221
 222 static inline int
 223 __gthread_mutex_unlock (__gthread_mutex_t *mutex __attribute__ ((__unused__)))
 224 {
 225   return 0;
 226 }
 227
 228 #endif /* _LIBOBJC */
 229
 230 #endif /* not __gthr_single_h */