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
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
2002110-1301, 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
34typedef int __gthread_mutex_t;
35typedef 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 */
48static void *thread_local_storage = NULL;
49
50/* Backend initialization functions */
51
52/* Initialize the threads subsystem.  */
53static 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.  */
61static 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.  */
71static 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.  */
79static 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.  */
87static 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.  */
94static inline void
95__gthread_objc_thread_yield (void)
96{
97  return;
98}
99
100/* Terminate the current thread.  */
101static 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.  */
111static 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.  */
119static 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.  */
127static 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.  */
136static inline int
137__gthread_objc_mutex_allocate (objc_mutex_t UNUSED(mutex))
138{
139  return 0;
140}
141
142/* Deallocate a mutex.  */
143static 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.  */
150static 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.  */
158static 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 */
166static 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.  */
175static inline int
176__gthread_objc_condition_allocate (objc_condition_t UNUSED(condition))
177{
178  return 0;
179}
180
181/* Deallocate a condition.  */
182static inline int
183__gthread_objc_condition_deallocate (objc_condition_t UNUSED(condition))
184{
185  return 0;
186}
187
188/* Wait on the condition */
189static 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.  */
197static 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.  */
204static inline int
205__gthread_objc_condition_signal (objc_condition_t UNUSED(condition))
206{
207  return 0;
208}
209
210#else /* _LIBOBJC */
211
212static inline int
213__gthread_active_p (void)
214{
215  return 0;
216}
217
218static inline int
219__gthread_mutex_lock (__gthread_mutex_t * UNUSED(mutex))
220{
221  return 0;
222}
223
224static inline int
225__gthread_mutex_trylock (__gthread_mutex_t * UNUSED(mutex))
226{
227  return 0;
228}
229
230static inline int
231__gthread_mutex_unlock (__gthread_mutex_t * UNUSED(mutex))
232{
233  return 0;
234}
235
236static inline int
237__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
238{
239  return __gthread_mutex_lock (mutex);
240}
241
242static inline int
243__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
244{
245  return __gthread_mutex_trylock (mutex);
246}
247
248static 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 */
259