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111
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1 /* Threads compatibility routines for libgcc2 and libobjc. */
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2 /* Compile this one with gcc. */
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145
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3 /* Copyright (C) 1997-2020 Free Software Foundation, Inc.
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111
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #ifndef GCC_GTHR_SINGLE_H
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27 #define GCC_GTHR_SINGLE_H
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28
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29 /* Just provide compatibility for mutex handling. */
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30
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31 typedef int __gthread_key_t;
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32 typedef int __gthread_once_t;
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33 typedef int __gthread_mutex_t;
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34 typedef int __gthread_recursive_mutex_t;
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35
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36 #define __GTHREAD_ONCE_INIT 0
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37 #define __GTHREAD_MUTEX_INIT 0
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38 #define __GTHREAD_MUTEX_INIT_FUNCTION(mx) do {} while (0)
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39 #define __GTHREAD_RECURSIVE_MUTEX_INIT 0
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40
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41 #define UNUSED __attribute__((__unused__))
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42
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43 #ifdef _LIBOBJC
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44
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45 /* Thread local storage for a single thread */
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46 static void *thread_local_storage = NULL;
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47
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48 /* Backend initialization functions */
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49
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50 /* Initialize the threads subsystem. */
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51 static inline int
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52 __gthread_objc_init_thread_system (void)
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53 {
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54 /* No thread support available */
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55 return -1;
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56 }
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57
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58 /* Close the threads subsystem. */
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59 static inline int
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60 __gthread_objc_close_thread_system (void)
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61 {
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62 /* No thread support available */
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63 return -1;
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64 }
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65
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66 /* Backend thread functions */
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67
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68 /* Create a new thread of execution. */
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69 static inline objc_thread_t
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70 __gthread_objc_thread_detach (void (* func)(void *), void * arg UNUSED)
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71 {
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72 /* No thread support available */
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73 return NULL;
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74 }
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75
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76 /* Set the current thread's priority. */
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77 static inline int
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78 __gthread_objc_thread_set_priority (int priority UNUSED)
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79 {
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80 /* No thread support available */
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81 return -1;
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82 }
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83
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84 /* Return the current thread's priority. */
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85 static inline int
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86 __gthread_objc_thread_get_priority (void)
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87 {
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88 return OBJC_THREAD_INTERACTIVE_PRIORITY;
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89 }
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90
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91 /* Yield our process time to another thread. */
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92 static inline void
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93 __gthread_objc_thread_yield (void)
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94 {
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95 return;
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96 }
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97
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98 /* Terminate the current thread. */
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99 static inline int
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100 __gthread_objc_thread_exit (void)
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101 {
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102 /* No thread support available */
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103 /* Should we really exit the program */
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104 /* exit (&__objc_thread_exit_status); */
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105 return -1;
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106 }
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107
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108 /* Returns an integer value which uniquely describes a thread. */
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109 static inline objc_thread_t
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110 __gthread_objc_thread_id (void)
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111 {
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112 /* No thread support, use 1. */
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113 return (objc_thread_t) 1;
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114 }
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115
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116 /* Sets the thread's local storage pointer. */
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117 static inline int
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118 __gthread_objc_thread_set_data (void *value)
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119 {
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120 thread_local_storage = value;
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121 return 0;
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122 }
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123
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124 /* Returns the thread's local storage pointer. */
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125 static inline void *
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126 __gthread_objc_thread_get_data (void)
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127 {
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128 return thread_local_storage;
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129 }
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130
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131 /* Backend mutex functions */
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132
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133 /* Allocate a mutex. */
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134 static inline int
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135 __gthread_objc_mutex_allocate (objc_mutex_t mutex UNUSED)
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136 {
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137 return 0;
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138 }
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139
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140 /* Deallocate a mutex. */
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141 static inline int
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142 __gthread_objc_mutex_deallocate (objc_mutex_t mutex UNUSED)
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143 {
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144 return 0;
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145 }
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146
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147 /* Grab a lock on a mutex. */
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148 static inline int
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149 __gthread_objc_mutex_lock (objc_mutex_t mutex UNUSED)
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150 {
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151 /* There can only be one thread, so we always get the lock */
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152 return 0;
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153 }
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154
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155 /* Try to grab a lock on a mutex. */
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156 static inline int
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157 __gthread_objc_mutex_trylock (objc_mutex_t mutex UNUSED)
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158 {
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159 /* There can only be one thread, so we always get the lock */
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160 return 0;
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161 }
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162
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163 /* Unlock the mutex */
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164 static inline int
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165 __gthread_objc_mutex_unlock (objc_mutex_t mutex UNUSED)
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166 {
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167 return 0;
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168 }
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169
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170 /* Backend condition mutex functions */
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171
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172 /* Allocate a condition. */
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173 static inline int
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174 __gthread_objc_condition_allocate (objc_condition_t condition UNUSED)
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175 {
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176 return 0;
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177 }
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178
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179 /* Deallocate a condition. */
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180 static inline int
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181 __gthread_objc_condition_deallocate (objc_condition_t condition UNUSED)
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182 {
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183 return 0;
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184 }
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185
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186 /* Wait on the condition */
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187 static inline int
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188 __gthread_objc_condition_wait (objc_condition_t condition UNUSED,
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189 objc_mutex_t mutex UNUSED)
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190 {
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191 return 0;
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192 }
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193
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194 /* Wake up all threads waiting on this condition. */
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195 static inline int
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196 __gthread_objc_condition_broadcast (objc_condition_t condition UNUSED)
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197 {
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198 return 0;
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199 }
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200
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201 /* Wake up one thread waiting on this condition. */
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202 static inline int
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203 __gthread_objc_condition_signal (objc_condition_t condition UNUSED)
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204 {
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205 return 0;
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206 }
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207
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208 #else /* _LIBOBJC */
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209
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210 static inline int
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211 __gthread_active_p (void)
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212 {
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213 return 0;
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214 }
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215
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216 static inline int
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217 __gthread_once (__gthread_once_t *__once UNUSED, void (*__func) (void) UNUSED)
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218 {
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219 return 0;
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220 }
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221
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222 static inline int UNUSED
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223 __gthread_key_create (__gthread_key_t *__key UNUSED, void (*__func) (void *) UNUSED)
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224 {
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225 return 0;
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226 }
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227
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228 static int UNUSED
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229 __gthread_key_delete (__gthread_key_t __key UNUSED)
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230 {
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231 return 0;
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232 }
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233
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234 static inline void *
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235 __gthread_getspecific (__gthread_key_t __key UNUSED)
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236 {
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237 return 0;
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238 }
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239
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240 static inline int
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241 __gthread_setspecific (__gthread_key_t __key UNUSED, const void *__v UNUSED)
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242 {
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243 return 0;
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244 }
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245
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246 static inline int
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247 __gthread_mutex_destroy (__gthread_mutex_t *__mutex UNUSED)
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248 {
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249 return 0;
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250 }
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251
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252 static inline int
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253 __gthread_mutex_lock (__gthread_mutex_t *__mutex UNUSED)
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254 {
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255 return 0;
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256 }
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257
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258 static inline int
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259 __gthread_mutex_trylock (__gthread_mutex_t *__mutex UNUSED)
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260 {
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261 return 0;
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262 }
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263
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264 static inline int
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265 __gthread_mutex_unlock (__gthread_mutex_t *__mutex UNUSED)
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266 {
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267 return 0;
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268 }
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269
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270 static inline int
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271 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
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272 {
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273 return __gthread_mutex_lock (__mutex);
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274 }
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275
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276 static inline int
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277 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
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278 {
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279 return __gthread_mutex_trylock (__mutex);
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280 }
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281
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282 static inline int
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283 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
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284 {
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285 return __gthread_mutex_unlock (__mutex);
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286 }
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287
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288 static inline int
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289 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
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290 {
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291 return __gthread_mutex_destroy (__mutex);
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292 }
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293
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294 #endif /* _LIBOBJC */
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295
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296 #undef UNUSED
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297
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298 #endif /* ! GCC_GTHR_SINGLE_H */
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