* ChangeLog: Follow spelling conventions.
[official-gcc.git] / gcc / gthr-single.h
blob64ff354131d5c82cffe95f55d17027f16466b7c5
1 /* Threads compatibility routines for libgcc2 and libobjc. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GCC.
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.
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.
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, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
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. */
29 #ifndef GCC_GTHR_SINGLE_H
30 #define GCC_GTHR_SINGLE_H
32 /* Just provide compatibility for mutex handling. */
34 typedef int __gthread_mutex_t;
36 #define __GTHREAD_MUTEX_INIT 0
38 #ifdef __cplusplus
39 #define UNUSED(x)
40 #else
41 #define UNUSED(x) x __attribute__((unused))
42 #endif
44 #ifdef _LIBOBJC
46 /* Thread local storage for a single thread */
47 static void *thread_local_storage = NULL;
49 /* Backend initialization functions */
51 /* Initialize the threads subsystem. */
52 static inline int
53 __gthread_objc_init_thread_system(void)
55 /* No thread support available */
56 return -1;
59 /* Close the threads subsystem. */
60 static inline int
61 __gthread_objc_close_thread_system(void)
63 /* No thread support available */
64 return -1;
67 /* Backend thread functions */
69 /* Create a new thread of execution. */
70 static inline objc_thread_t
71 __gthread_objc_thread_detach(void (* func)(void *), void * UNUSED(arg))
73 /* No thread support available */
74 return NULL;
77 /* Set the current thread's priority. */
78 static inline int
79 __gthread_objc_thread_set_priority(int UNUSED(priority))
81 /* No thread support available */
82 return -1;
85 /* Return the current thread's priority. */
86 static inline int
87 __gthread_objc_thread_get_priority(void)
89 return OBJC_THREAD_INTERACTIVE_PRIORITY;
92 /* Yield our process time to another thread. */
93 static inline void
94 __gthread_objc_thread_yield(void)
96 return;
99 /* Terminate the current thread. */
100 static inline int
101 __gthread_objc_thread_exit(void)
103 /* No thread support available */
104 /* Should we really exit the program */
105 /* exit(&__objc_thread_exit_status); */
106 return -1;
109 /* Returns an integer value which uniquely describes a thread. */
110 static inline objc_thread_t
111 __gthread_objc_thread_id(void)
113 /* No thread support, use 1. */
114 return (objc_thread_t)1;
117 /* Sets the thread's local storage pointer. */
118 static inline int
119 __gthread_objc_thread_set_data(void *value)
121 thread_local_storage = value;
122 return 0;
125 /* Returns the thread's local storage pointer. */
126 static inline void *
127 __gthread_objc_thread_get_data(void)
129 return thread_local_storage;
132 /* Backend mutex functions */
134 /* Allocate a mutex. */
135 static inline int
136 __gthread_objc_mutex_allocate(objc_mutex_t UNUSED(mutex))
138 return 0;
141 /* Deallocate a mutex. */
142 static inline int
143 __gthread_objc_mutex_deallocate(objc_mutex_t UNUSED(mutex))
145 return 0;
148 /* Grab a lock on a mutex. */
149 static inline int
150 __gthread_objc_mutex_lock(objc_mutex_t UNUSED(mutex))
152 /* There can only be one thread, so we always get the lock */
153 return 0;
156 /* Try to grab a lock on a mutex. */
157 static inline int
158 __gthread_objc_mutex_trylock(objc_mutex_t UNUSED(mutex))
160 /* There can only be one thread, so we always get the lock */
161 return 0;
164 /* Unlock the mutex */
165 static inline int
166 __gthread_objc_mutex_unlock(objc_mutex_t UNUSED(mutex))
168 return 0;
171 /* Backend condition mutex functions */
173 /* Allocate a condition. */
174 static inline int
175 __gthread_objc_condition_allocate(objc_condition_t UNUSED(condition))
177 return 0;
180 /* Deallocate a condition. */
181 static inline int
182 __gthread_objc_condition_deallocate(objc_condition_t UNUSED(condition))
184 return 0;
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))
192 return 0;
195 /* Wake up all threads waiting on this condition. */
196 static inline int
197 __gthread_objc_condition_broadcast(objc_condition_t UNUSED(condition))
199 return 0;
202 /* Wake up one thread waiting on this condition. */
203 static inline int
204 __gthread_objc_condition_signal(objc_condition_t UNUSED(condition))
206 return 0;
209 #else /* _LIBOBJC */
211 static inline int
212 __gthread_active_p (void)
214 return 0;
217 static inline int
218 __gthread_mutex_lock (__gthread_mutex_t * UNUSED(mutex))
220 return 0;
223 static inline int
224 __gthread_mutex_trylock (__gthread_mutex_t * UNUSED(mutex))
226 return 0;
229 static inline int
230 __gthread_mutex_unlock (__gthread_mutex_t * UNUSED(mutex))
232 return 0;
235 #endif /* _LIBOBJC */
237 #undef UNUSED
239 #endif /* ! GCC_GTHR_SINGLE_H */