gcc/gthr-single.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000, 2004 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, 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 typedef int __gthread_recursive_mutex_t;
  36
  37 #define __GTHREAD_MUTEX_INIT 0
  38
  39 #ifdef __cplusplus
  40 #define UNUSED(x)
  41 #else
  42 #define UNUSED(x) x __attribute__((unused))
  43 #endif
  44
  45 #ifdef _LIBOBJC
  46
  47 /* Thread local storage for a single thread */
  48 static void *thread_local_storage = NULL;
  49
  50 /* Backend initialization functions */
  51
  52 /* Initialize the threads subsystem.  */
  53 static inline int
  54 __gthread_objc_init_thread_system (void)
  55 {
  56   /* No thread support available */
  57   return -1;
  58 }
  59
  60 /* Close the threads subsystem.  */
  61 static inline int
  62 __gthread_objc_close_thread_system (void)
  63 {
  64   /* No thread support available */
  65   return -1;
  66 }
  67
  68 /* Backend thread functions */
  69
  70 /* Create a new thread of execution.  */
  71 static inline objc_thread_t
  72 __gthread_objc_thread_detach (void (* func)(void *), void * UNUSED(arg))
  73 {
  74   /* No thread support available */
  75   return NULL;
  76 }
  77
  78 /* Set the current thread's priority.  */
  79 static inline int
  80 __gthread_objc_thread_set_priority (int UNUSED(priority))
  81 {
  82   /* No thread support available */
  83   return -1;
  84 }
  85
  86 /* Return the current thread's priority.  */
  87 static inline int
  88 __gthread_objc_thread_get_priority (void)
  89 {
  90   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  91 }
  92
  93 /* Yield our process time to another thread.  */
  94 static inline void
  95 __gthread_objc_thread_yield (void)
  96 {
  97   return;
  98 }
  99
 100 /* Terminate the current thread.  */
 101 static inline int
 102 __gthread_objc_thread_exit (void)
 103 {
 104   /* No thread support available */
 105   /* Should we really exit the program */
 106   /* exit (&__objc_thread_exit_status); */
 107   return -1;
 108 }
 109
 110 /* Returns an integer value which uniquely describes a thread.  */
 111 static inline objc_thread_t
 112 __gthread_objc_thread_id (void)
 113 {
 114   /* No thread support, use 1.  */
 115   return (objc_thread_t) 1;
 116 }
 117
 118 /* Sets the thread's local storage pointer.  */
 119 static inline int
 120 __gthread_objc_thread_set_data (void *value)
 121 {
 122   thread_local_storage = value;
 123   return 0;
 124 }
 125
 126 /* Returns the thread's local storage pointer.  */
 127 static inline void *
 128 __gthread_objc_thread_get_data (void)
 129 {
 130   return thread_local_storage;
 131 }
 132
 133 /* Backend mutex functions */
 134
 135 /* Allocate a mutex.  */
 136 static inline int
 137 __gthread_objc_mutex_allocate (objc_mutex_t UNUSED(mutex))
 138 {
 139   return 0;
 140 }
 141
 142 /* Deallocate a mutex.  */
 143 static inline int
 144 __gthread_objc_mutex_deallocate (objc_mutex_t UNUSED(mutex))
 145 {
 146   return 0;
 147 }
 148
 149 /* Grab a lock on a mutex.  */
 150 static inline int
 151 __gthread_objc_mutex_lock (objc_mutex_t UNUSED(mutex))
 152 {
 153   /* There can only be one thread, so we always get the lock */
 154   return 0;
 155 }
 156
 157 /* Try to grab a lock on a mutex.  */
 158 static inline int
 159 __gthread_objc_mutex_trylock (objc_mutex_t UNUSED(mutex))
 160 {
 161   /* There can only be one thread, so we always get the lock */
 162   return 0;
 163 }
 164
 165 /* Unlock the mutex */
 166 static inline int
 167 __gthread_objc_mutex_unlock (objc_mutex_t UNUSED(mutex))
 168 {
 169   return 0;
 170 }
 171
 172 /* Backend condition mutex functions */
 173
 174 /* Allocate a condition.  */
 175 static inline int
 176 __gthread_objc_condition_allocate (objc_condition_t UNUSED(condition))
 177 {
 178   return 0;
 179 }
 180
 181 /* Deallocate a condition.  */
 182 static inline int
 183 __gthread_objc_condition_deallocate (objc_condition_t UNUSED(condition))
 184 {
 185   return 0;
 186 }
 187
 188 /* Wait on the condition */
 189 static inline int
 190 __gthread_objc_condition_wait (objc_condition_t UNUSED(condition),
 191                                objc_mutex_t UNUSED(mutex))
 192 {
 193   return 0;
 194 }
 195
 196 /* Wake up all threads waiting on this condition.  */
 197 static inline int
 198 __gthread_objc_condition_broadcast (objc_condition_t UNUSED(condition))
 199 {
 200   return 0;
 201 }
 202
 203 /* Wake up one thread waiting on this condition.  */
 204 static inline int
 205 __gthread_objc_condition_signal (objc_condition_t UNUSED(condition))
 206 {
 207   return 0;
 208 }
 209
 210 #else /* _LIBOBJC */
 211
 212 static inline int
 213 __gthread_active_p (void)
 214 {
 215   return 0;
 216 }
 217
 218 static inline int
 219 __gthread_mutex_lock (__gthread_mutex_t * UNUSED(mutex))
 220 {
 221   return 0;
 222 }
 223
 224 static inline int
 225 __gthread_mutex_trylock (__gthread_mutex_t * UNUSED(mutex))
 226 {
 227   return 0;
 228 }
 229
 230 static inline int
 231 __gthread_mutex_unlock (__gthread_mutex_t * UNUSED(mutex))
 232 {
 233   return 0;
 234 }
 235
 236 static inline int
 237 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
 238 {
 239   return __gthread_mutex_lock (mutex);
 240 }
 241
 242 static inline int
 243 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
 244 {
 245   return __gthread_mutex_trylock (mutex);
 246 }
 247
 248 static inline int
 249 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
 250 {
 251   return __gthread_mutex_unlock (mutex);
 252 }
 253
 254 #endif /* _LIBOBJC */
 255
 256 #undef UNUSED
 257
 258 #endif /* ! GCC_GTHR_SINGLE_H */