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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 | ||
38709cad | 5 | This file is part of GCC. |
88e17b57 | 6 | |
38709cad | 7 | GCC is free software; you can redistribute it and/or modify it under the |
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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 | ||
38709cad | 11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
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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 | |
38709cad | 17 | GCC; see the file COPYING. If not, write to the Free Software |
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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 | |
37 | __objc_init_thread_system(void) | |
38 | { | |
39 | /* No thread support available */ | |
40 | return -1; | |
41 | } | |
42 | ||
43 | /* Close the threads subsystem. */ | |
44 | int | |
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 | |
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 | |
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 | |
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 | |
78 | __objc_thread_yield(void) | |
79 | { | |
80 | return; | |
81 | } | |
82 | ||
83 | /* Terminate the current thread. */ | |
84 | int | |
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 | |
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 | |
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 * | |
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 | |
120 | __objc_mutex_allocate(objc_mutex_t mutex) | |
121 | { | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /* Deallocate a mutex. */ | |
126 | int | |
127 | __objc_mutex_deallocate(objc_mutex_t mutex) | |
128 | { | |
129 | return 0; | |
130 | } | |
131 | ||
132 | /* Grab a lock on a mutex. */ | |
133 | int | |
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 | |
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 | |
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 | |
159 | __objc_condition_allocate(objc_condition_t condition) | |
160 | { | |
161 | return 0; | |
162 | } | |
163 | ||
164 | /* Deallocate a condition. */ | |
165 | int | |
166 | __objc_condition_deallocate(objc_condition_t condition) | |
167 | { | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /* Wait on the condition */ | |
172 | int | |
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 | |
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 | |
187 | __objc_condition_signal(objc_condition_t condition) | |
188 | { | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* End of File */ |