1 /* GNU Objective C Runtime Thread Implementation
2 Copyright (C) 1996, 1997 Free Software Foundation, Inc.
3 Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under the
8 terms of the GNU General Public License as published by the Free Software
9 Foundation; either version 2, or (at your option) any later version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14 details.
15
16 You should have received a copy of the GNU General Public License along with
17 GCC; see the file COPYING. If not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 /* As a special exception, if you link this library with files compiled with
22 GCC to produce an executable, this does not cause the resulting executable
23 to be covered by the GNU General Public License. This exception does not
24 however invalidate any other reasons why the executable file might be
25 covered by the GNU General Public License. */
26
27 #include <objc/thr.h>
28 #include "runtime.h"
29
30 /* Thread local storage for a single thread */
31 static void *thread_local_storage = NULL;
32
33 /* Backend initialization functions */
34
35 /* Initialize the threads subsystem. */
36 int
__objc_init_thread_system(void)37 __objc_init_thread_system(void)
38 {
39 /* No thread support available */
40 return -1;
41 }
42
43 /* Close the threads subsystem. */
44 int
__objc_close_thread_system(void)45 __objc_close_thread_system(void)
46 {
47 /* No thread support available */
48 return -1;
49 }
50
51 /* Backend thread functions */
52
53 /* Create a new thread of execution. */
54 objc_thread_t
__objc_thread_detach(void (* func)(void * arg),void * arg)55 __objc_thread_detach(void (*func)(void *arg), void *arg)
56 {
57 /* No thread support available */
58 return NULL;
59 }
60
61 /* Set the current thread's priority. */
62 int
__objc_thread_set_priority(int priority)63 __objc_thread_set_priority(int priority)
64 {
65 /* No thread support available */
66 return -1;
67 }
68
69 /* Return the current thread's priority. */
70 int
__objc_thread_get_priority(void)71 __objc_thread_get_priority(void)
72 {
73 return OBJC_THREAD_INTERACTIVE_PRIORITY;
74 }
75
76 /* Yield our process time to another thread. */
77 void
__objc_thread_yield(void)78 __objc_thread_yield(void)
79 {
80 return;
81 }
82
83 /* Terminate the current thread. */
84 int
__objc_thread_exit(void)85 __objc_thread_exit(void)
86 {
87 /* No thread support available */
88 /* Should we really exit the program */
89 /* exit(&__objc_thread_exit_status); */
90 return -1;
91 }
92
93 /* Returns an integer value which uniquely describes a thread. */
94 objc_thread_t
__objc_thread_id(void)95 __objc_thread_id(void)
96 {
97 /* No thread support, use 1. */
98 return (objc_thread_t)1;
99 }
100
101 /* Sets the thread's local storage pointer. */
102 int
__objc_thread_set_data(void * value)103 __objc_thread_set_data(void *value)
104 {
105 thread_local_storage = value;
106 return 0;
107 }
108
109 /* Returns the thread's local storage pointer. */
110 void *
__objc_thread_get_data(void)111 __objc_thread_get_data(void)
112 {
113 return thread_local_storage;
114 }
115
116 /* Backend mutex functions */
117
118 /* Allocate a mutex. */
119 int
__objc_mutex_allocate(objc_mutex_t mutex)120 __objc_mutex_allocate(objc_mutex_t mutex)
121 {
122 return 0;
123 }
124
125 /* Deallocate a mutex. */
126 int
__objc_mutex_deallocate(objc_mutex_t mutex)127 __objc_mutex_deallocate(objc_mutex_t mutex)
128 {
129 return 0;
130 }
131
132 /* Grab a lock on a mutex. */
133 int
__objc_mutex_lock(objc_mutex_t mutex)134 __objc_mutex_lock(objc_mutex_t mutex)
135 {
136 /* There can only be one thread, so we always get the lock */
137 return 0;
138 }
139
140 /* Try to grab a lock on a mutex. */
141 int
__objc_mutex_trylock(objc_mutex_t mutex)142 __objc_mutex_trylock(objc_mutex_t mutex)
143 {
144 /* There can only be one thread, so we always get the lock */
145 return 0;
146 }
147
148 /* Unlock the mutex */
149 int
__objc_mutex_unlock(objc_mutex_t mutex)150 __objc_mutex_unlock(objc_mutex_t mutex)
151 {
152 return 0;
153 }
154
155 /* Backend condition mutex functions */
156
157 /* Allocate a condition. */
158 int
__objc_condition_allocate(objc_condition_t condition)159 __objc_condition_allocate(objc_condition_t condition)
160 {
161 return 0;
162 }
163
164 /* Deallocate a condition. */
165 int
__objc_condition_deallocate(objc_condition_t condition)166 __objc_condition_deallocate(objc_condition_t condition)
167 {
168 return 0;
169 }
170
171 /* Wait on the condition */
172 int
__objc_condition_wait(objc_condition_t condition,objc_mutex_t mutex)173 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
174 {
175 return 0;
176 }
177
178 /* Wake up all threads waiting on this condition. */
179 int
__objc_condition_broadcast(objc_condition_t condition)180 __objc_condition_broadcast(objc_condition_t condition)
181 {
182 return 0;
183 }
184
185 /* Wake up one thread waiting on this condition. */
186 int
__objc_condition_signal(objc_condition_t condition)187 __objc_condition_signal(objc_condition_t condition)
188 {
189 return 0;
190 }
191
192 /* End of File */
193