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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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3 /* Copyright (C) 2002, 2003, 2004, 2008, 2009 Free Software Foundation, Inc.
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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_NKS_H
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27 #define GCC_GTHR_NKS_H
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28
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29 /* NKS threads specific definitions.
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30 Easy, since the interface is mostly one-to-one mapping. */
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31
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32 #define __GTHREADS 1
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33
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34 #define NKS_NO_INLINE_FUNCS
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35 #include <nksapi.h>
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36 #include <string.h>
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37
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38 typedef NXKey_t __gthread_key_t;
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39 typedef NXMutex_t *__gthread_mutex_t;
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40 typedef NXMutex_t *__gthread_recursive_mutex_t;
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41
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42 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
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43 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
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44
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45 static inline int
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46 __gthread_active_p (void)
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47 {
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48 return 1;
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49 }
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50
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51 #ifdef _LIBOBJC
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52
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53 /* This is the config.h file in libobjc/ */
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54 #include <config.h>
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55
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56 #ifdef HAVE_SCHED_H
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57 # include <sched.h>
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58 #endif
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59
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60 /* Key structure for maintaining thread specific storage */
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61 static NXKey_t _objc_thread_storage;
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62
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63 /* Backend initialization functions */
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64
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65 /* Initialize the threads subsystem. */
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66 static inline int
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67 __gthread_objc_init_thread_system (void)
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68 {
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69 /* Initialize the thread storage key. */
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70 if (NXKeyCreate (NULL, NULL, &_objc_thread_storage) == 0)
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71 return 0;
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72 return -1;
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73 }
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74
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75 /* Close the threads subsystem. */
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76 static inline int
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77 __gthread_objc_close_thread_system (void)
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78 {
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79 if (NXKeyDelete (_objc_thread_storage) == 0)
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80 return 0;
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81 return -1;
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82 }
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83
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84 /* Backend thread functions */
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85
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86 /* Create a new thread of execution. */
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87 static inline objc_thread_t
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88 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
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89 {
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90 objc_thread_t thread_id;
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91 NXContext_t context;
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92 NXThreadId_t new_thread_handle;
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93 int err;
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94
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95 if ((context = NXContextAlloc (func, arg, NX_PRIO_MED, 0, 0, 0, &err)) == NULL)
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96 thread_id = NULL;
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97 else if (NXThreadCreate (context, NX_THR_DETACHED, &new_thread_handle) == 0)
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98 thread_id = (objc_thread_t) new_thread_handle;
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99 else {
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100 NXContextFree (context);
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101 thread_id = NULL;
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102 }
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103
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104 return thread_id;
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105 }
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106
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107 /* Set the current thread's priority. */
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108 static inline int
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109 __gthread_objc_thread_set_priority (int priority)
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110 {
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111 if (NXThreadSetPriority (NXThreadGetId (), priority) == 0)
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112 return 0;
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113 return -1;
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114 }
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115
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116 /* Return the current thread's priority. */
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117 static inline int
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118 __gthread_objc_thread_get_priority (void)
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119 {
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120 int priority;
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121
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122 if (NXThreadGetPriority (NXThreadGetId (), &priority) == 0)
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123 return priority;
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124 return -1;
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125 }
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126
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127 /* Yield our process time to another thread. */
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128 static inline void
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129 __gthread_objc_thread_yield (void)
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130 {
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131 NXThreadYield ();
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132 }
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133
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134 /* Terminate the current thread. */
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135 static inline int
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136 __gthread_objc_thread_exit (void)
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137 {
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138 /* exit the thread */
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139 NXThreadExit (&__objc_thread_exit_status);
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140
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141 /* Failed if we reached here */
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142 return -1;
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143 }
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144
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145 /* Returns an integer value which uniquely describes a thread. */
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146 static inline objc_thread_t
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147 __gthread_objc_thread_id (void)
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148 {
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149 (objc_thread_t) NXThreadGetId ();
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150 }
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151
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152 /* Sets the thread's local storage pointer. */
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153 static inline int
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154 __gthread_objc_thread_set_data (void *value)
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155 {
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156 return NXKeySetValue (_objc_thread_storage, value);
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157 }
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158
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159 /* Returns the thread's local storage pointer. */
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160 static inline void *
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161 __gthread_objc_thread_get_data (void)
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162 {
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163 void *value;
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164
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165 if (NXKeyGetValue (_objc_thread_storage, &value) == 0)
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166 return value;
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167 return NULL;
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168 }
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169
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170 /* Backend mutex functions */
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171
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172 /* Allocate a mutex. */
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173 static inline int
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174 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
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175 {
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176 static const NX_LOCK_INFO_ALLOC (info, "GNU ObjC", 0);
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177
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178 if ((mutex->backend = NXMutexAlloc (0, 0, &info)) == NULL)
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179 return 0;
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180 return -1;
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181 }
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182
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183 /* Deallocate a mutex. */
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184 static inline int
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185 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
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186 {
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187 while (NXMutexIsOwned ((NXMutex_t *)mutex->backend))
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188 NXUnlock ((NXMutex_t *)mutex->backend);
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189 if (NXMutexFree ((NXMutex_t *)mutex->backend) != 0)
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190 return -1;
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191 mutex->backend = NULL;
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192 return 0;
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193 }
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194
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195 /* Grab a lock on a mutex. */
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196 static inline int
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197 __gthread_objc_mutex_lock (objc_mutex_t mutex)
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198 {
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199 return NXLock ((NXMutex_t *)mutex->backend);
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200 }
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201
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202 /* Try to grab a lock on a mutex. */
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203 static inline int
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204 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
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205 {
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206 if (!NXTryLock ((NXMutex_t *)mutex->backend))
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207 return -1;
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208 return 0;
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209 }
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210
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211 /* Unlock the mutex */
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212 static inline int
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213 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
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214 {
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215 return NXUnlock ((NXMutex_t *)mutex->backend);
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216 }
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217
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218 /* Backend condition mutex functions */
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219
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220 /* Allocate a condition. */
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221 static inline int
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222 __gthread_objc_condition_allocate (objc_condition_t condition)
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223 {
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224 condition->backend = NXCondAlloc (NULL);
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225 if (condition->backend == NULL)
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226 return -1;
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227
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228 return 0;
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229 }
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230
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231 /* Deallocate a condition. */
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232 static inline int
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233 __gthread_objc_condition_deallocate (objc_condition_t condition)
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234 {
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235 if (NXCondFree ((NXCond_t *)condition->backend) != 0)
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236 return -1;
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237 condition->backend = NULL;
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238 return 0;
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239 }
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240
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241 /* Wait on the condition */
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242 static inline int
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243 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
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244 {
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245 return NXCondWait ((NXCond_t *)condition->backend, (NXMutex_t *)mutex->backend);
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246 }
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247
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248 /* Wake up all threads waiting on this condition. */
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249 static inline int
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250 __gthread_objc_condition_broadcast (objc_condition_t condition)
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251 {
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252 return NXCondBroadcast ((NXCond_t *)condition->backend);
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253 }
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254
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255 /* Wake up one thread waiting on this condition. */
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256 static inline int
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257 __gthread_objc_condition_signal (objc_condition_t condition)
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258 {
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259 return NXCondSignal ((NXCond_t *)condition->backend);
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260 }
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261
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262 #else /* _LIBOBJC */
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263
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264 #if defined(__cplusplus)
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265 # include <bits/atomicity.h>
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266 /* The remaining conditions here are temporary until there is
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267 an application accessible atomic operations API set... */
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268 #elif defined(_M_IA64) || defined(__ia64__)
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269 # include <../libstdc++-v3/config/cpu/ia64/bits/atomicity.h>
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270 #elif defined(_M_IX86) || defined(__i486__)
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271 # include <../libstdc++-v3/config/cpu/i486/bits/atomicity.h>
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272 #elif defined(_M_AMD64) || defined(__x86_64__)
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273 # include <../libstdc++-v3/config/cpu/x86-64/bits/atomicity.h>
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274 #endif
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275
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276 typedef volatile long __gthread_once_t;
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277
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278 #define __GTHREAD_ONCE_INIT 0
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279
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280 static inline int
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281 __gthread_once (__gthread_once_t *__once, void (*__func) (void))
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282 {
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283 if (__compare_and_swap (__once, 0, 1))
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284 {
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285 __func ();
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286 *__once |= 2;
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287 }
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288 else
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289 {
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290 while (!(*__once & 2))
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291 NXThreadYield ();
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292 }
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293 return 0;
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294 }
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295
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296 static inline int
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297 __gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
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298 {
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299 return NXKeyCreate (__dtor, NULL, __key);
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300 }
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301
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302 static inline int
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303 __gthread_key_dtor (__gthread_key_t __key, void *__ptr)
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304 {
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305 /* Just reset the key value to zero. */
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306 if (__ptr)
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307 return NXKeySetValue (__key, NULL);
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308 return 0;
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309 }
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310
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311 static inline int
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312 __gthread_key_delete (__gthread_key_t __key)
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313 {
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314 return NXKeyDelete (__key);
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315 }
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316
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317 static inline void *
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318 __gthread_getspecific (__gthread_key_t __key)
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319 {
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320 void *__value;
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321
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322 if (NXKeyGetValue (__key, &__value) == 0)
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323 return __value;
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324 return NULL;
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325 }
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326
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327 static inline int
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328 __gthread_setspecific (__gthread_key_t __key, const void *__ptr)
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329 {
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330 return NXKeySetValue (__key, (void *)__ptr);
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331 }
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332
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333 static inline void
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334 __gthread_mutex_init_function (__gthread_mutex_t *__mutex)
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335 {
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336 static const NX_LOCK_INFO_ALLOC (__info, "GTHREADS", 0);
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337
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338 *__mutex = NXMutexAlloc (0, 0, &__info);
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339 }
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340
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341 static inline int
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342 __gthread_mutex_destroy (__gthread_mutex_t * UNUSED(__mutex))
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343 {
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344 return 0;
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345 }
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346
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347 static inline int
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348 __gthread_mutex_lock (__gthread_mutex_t *__mutex)
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349 {
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350 return NXLock (*__mutex);
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351 }
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352
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353 static inline int
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354 __gthread_mutex_trylock (__gthread_mutex_t *__mutex)
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355 {
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356 if (NXTryLock (*__mutex))
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357 return 0;
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358 return -1;
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359 }
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360
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361 static inline int
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362 __gthread_mutex_unlock (__gthread_mutex_t *__mutex)
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363 {
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364 return NXUnlock (*__mutex);
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365 }
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366
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367 static inline void
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368 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
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369 {
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370 static const NX_LOCK_INFO_ALLOC (__info, "GTHREADS", 0);
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371
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372 *__mutex = NXMutexAlloc (NX_MUTEX_RECURSIVE, 0, &__info);
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373 }
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374
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375 static inline int
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376 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
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377 {
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378 return NXLock (*__mutex);
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379 }
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380
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381 static inline int
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382 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
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383 {
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384 if (NXTryLock (*__mutex))
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385 return 0;
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386 return -1;
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387 }
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388
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389 static inline int
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390 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
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391 {
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392 return NXUnlock (*__mutex);
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393 }
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394
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395 #endif /* _LIBOBJC */
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396
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397 #endif /* not GCC_GTHR_NKS_H */
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