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 GCC_GTHR_SINGLE_H
  30 #define GCC_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 __cplusplus
  39 #define UNUSED(x)
  40 #else
  41 #define UNUSED(x) x __attribute__((unused))
  42 #endif
  43
  44 #ifdef _LIBOBJC
  45
  46 /* Thread local storage for a single thread */
  47 static void *thread_local_storage = NULL;
  48
  49 /* Backend initialization functions */
  50
  51 /* Initialize the threads subsystem. */
  52 static inline int
  53 __gthread_objc_init_thread_system(void)
  54 {
  55   /* No thread support available */
  56   return -1;
  57 }
  58
  59 /* Close the threads subsystem. */
  60 static inline int
  61 __gthread_objc_close_thread_system(void)
  62 {
  63   /* No thread support available */
  64   return -1;
  65 }
  66
  67 /* Backend thread functions */
  68
  69 /* Create a new thread of execution. */
  70 static inline objc_thread_t
  71 __gthread_objc_thread_detach(void (* func)(void *), void * UNUSED(arg))
  72 {
  73   /* No thread support available */
  74   return NULL;
  75 }
  76
  77 /* Set the current thread's priority. */
  78 static inline int
  79 __gthread_objc_thread_set_priority(int UNUSED(priority))
  80 {
  81   /* No thread support available */
  82   return -1;
  83 }
  84
  85 /* Return the current thread's priority. */
  86 static inline int
  87 __gthread_objc_thread_get_priority(void)
  88 {
  89   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  90 }
  91
  92 /* Yield our process time to another thread. */
  93 static inline void
  94 __gthread_objc_thread_yield(void)
  95 {
  96   return;
  97 }
  98
  99 /* Terminate the current thread. */
 100 static inline int
 101 __gthread_objc_thread_exit(void)
 102 {
 103   /* No thread support available */
 104   /* Should we really exit the program */
 105   /* exit(&__objc_thread_exit_status); */
 106   return -1;
 107 }
 108
 109 /* Returns an integer value which uniquely describes a thread. */
 110 static inline objc_thread_t
 111 __gthread_objc_thread_id(void)
 112 {
 113   /* No thread support, use 1. */
 114   return (objc_thread_t)1;
 115 }
 116
 117 /* Sets the thread's local storage pointer. */
 118 static inline int
 119 __gthread_objc_thread_set_data(void *value)
 120 {
 121   thread_local_storage = value;
 122   return 0;
 123 }
 124
 125 /* Returns the thread's local storage pointer. */
 126 static inline void *
 127 __gthread_objc_thread_get_data(void)
 128 {
 129   return thread_local_storage;
 130 }
 131
 132 /* Backend mutex functions */
 133
 134 /* Allocate a mutex. */
 135 static inline int
 136 __gthread_objc_mutex_allocate(objc_mutex_t UNUSED(mutex))
 137 {
 138   return 0;
 139 }
 140
 141 /* Deallocate a mutex. */
 142 static inline int
 143 __gthread_objc_mutex_deallocate(objc_mutex_t UNUSED(mutex))
 144 {
 145   return 0;
 146 }
 147
 148 /* Grab a lock on a mutex. */
 149 static inline int
 150 __gthread_objc_mutex_lock(objc_mutex_t UNUSED(mutex))
 151 {
 152   /* There can only be one thread, so we always get the lock */
 153   return 0;
 154 }
 155
 156 /* Try to grab a lock on a mutex. */
 157 static inline int
 158 __gthread_objc_mutex_trylock(objc_mutex_t UNUSED(mutex))
 159 {
 160   /* There can only be one thread, so we always get the lock */
 161   return 0;
 162 }
 163
 164 /* Unlock the mutex */
 165 static inline int
 166 __gthread_objc_mutex_unlock(objc_mutex_t UNUSED(mutex))
 167 {
 168   return 0;
 169 }
 170
 171 /* Backend condition mutex functions */
 172
 173 /* Allocate a condition. */
 174 static inline int
 175 __gthread_objc_condition_allocate(objc_condition_t UNUSED(condition))
 176 {
 177   return 0;
 178 }
 179
 180 /* Deallocate a condition. */
 181 static inline int
 182 __gthread_objc_condition_deallocate(objc_condition_t UNUSED(condition))
 183 {
 184   return 0;
 185 }
 186
 187 /* Wait on the condition */
 188 static inline int
 189 __gthread_objc_condition_wait(objc_condition_t UNUSED(condition),
 190                               objc_mutex_t UNUSED(mutex))
 191 {
 192   return 0;
 193 }
 194
 195 /* Wake up all threads waiting on this condition. */
 196 static inline int
 197 __gthread_objc_condition_broadcast(objc_condition_t UNUSED(condition))
 198 {
 199   return 0;
 200 }
 201
 202 /* Wake up one thread waiting on this condition. */
 203 static inline int
 204 __gthread_objc_condition_signal(objc_condition_t UNUSED(condition))
 205 {
 206   return 0;
 207 }
 208
 209 #else /* _LIBOBJC */
 210
 211 static inline int
 212 __gthread_active_p (void)
 213 {
 214   return 0;
 215 }
 216
 217 static inline int
 218 __gthread_mutex_lock (__gthread_mutex_t * UNUSED(mutex))
 219 {
 220   return 0;
 221 }
 222
 223 static inline int
 224 __gthread_mutex_trylock (__gthread_mutex_t * UNUSED(mutex))
 225 {
 226   return 0;
 227 }
 228
 229 static inline int
 230 __gthread_mutex_unlock (__gthread_mutex_t * UNUSED(mutex))
 231 {
 232   return 0;
 233 }
 234
 235 #endif /* _LIBOBJC */
 236
 237 #undef UNUSED
 238
 239 #endif /* ! GCC_GTHR_SINGLE_H */