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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
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4 /* Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2008, 2009
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5 Free Software Foundation, Inc.
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6 Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
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7
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8 This file is part of GCC.
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9
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10 GCC is free software; you can redistribute it and/or modify it under
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11 the terms of the GNU General Public License as published by the Free
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12 Software Foundation; either version 3, or (at your option) any later
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13 version.
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14
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15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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18 for more details.
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19
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20 Under Section 7 of GPL version 3, you are granted additional
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21 permissions described in the GCC Runtime Library Exception, version
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22 3.1, as published by the Free Software Foundation.
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23
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24 You should have received a copy of the GNU General Public License and
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25 a copy of the GCC Runtime Library Exception along with this program;
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26 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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27 <http://www.gnu.org/licenses/>. */
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28
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29 #ifndef GCC_GTHR_WIN32_H
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30 #define GCC_GTHR_WIN32_H
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31
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32 /* Make sure CONST_CAST2 (origin in system.h) is declared. */
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33 #ifndef CONST_CAST2
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34 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
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35 #endif
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36
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37 /* Windows32 threads specific definitions. The windows32 threading model
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38 does not map well into pthread-inspired gcc's threading model, and so
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39 there are caveats one needs to be aware of.
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40
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41 1. The destructor supplied to __gthread_key_create is ignored for
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42 generic x86-win32 ports. This will certainly cause memory leaks
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43 due to unreclaimed eh contexts (sizeof (eh_context) is at least
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44 24 bytes for x86 currently).
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45
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46 This memory leak may be significant for long-running applications
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47 that make heavy use of C++ EH.
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48
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49 However, Mingw runtime (version 0.3 or newer) provides a mechanism
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50 to emulate pthreads key dtors; the runtime provides a special DLL,
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51 linked in if -mthreads option is specified, that runs the dtors in
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52 the reverse order of registration when each thread exits. If
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53 -mthreads option is not given, a stub is linked in instead of the
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54 DLL, which results in memory leak. Other x86-win32 ports can use
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55 the same technique of course to avoid the leak.
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56
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57 2. The error codes returned are non-POSIX like, and cast into ints.
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58 This may cause incorrect error return due to truncation values on
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59 hw where sizeof (DWORD) > sizeof (int).
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60
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61 3. We are currently using a special mutex instead of the Critical
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62 Sections, since Win9x does not support TryEnterCriticalSection
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63 (while NT does).
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64
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65 The basic framework should work well enough. In the long term, GCC
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66 needs to use Structured Exception Handling on Windows32. */
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67
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68 #define __GTHREADS 1
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69
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70 #include <errno.h>
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71 #ifdef __MINGW32__
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72 #include <_mingw.h>
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73 #endif
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74
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75 #ifdef _LIBOBJC
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76
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77 /* This is necessary to prevent windef.h (included from windows.h) from
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78 defining its own BOOL as a typedef. */
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79 #ifndef __OBJC__
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80 #define __OBJC__
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81 #endif
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82 #include <windows.h>
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83 /* Now undef the windows BOOL. */
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84 #undef BOOL
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85
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86 /* Key structure for maintaining thread specific storage */
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87 static DWORD __gthread_objc_data_tls = (DWORD) -1;
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88
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89 /* Backend initialization functions */
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90
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91 /* Initialize the threads subsystem. */
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92 int
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93 __gthread_objc_init_thread_system (void)
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94 {
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95 /* Initialize the thread storage key. */
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96 if ((__gthread_objc_data_tls = TlsAlloc ()) != (DWORD) -1)
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97 return 0;
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98 else
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99 return -1;
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100 }
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101
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102 /* Close the threads subsystem. */
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103 int
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104 __gthread_objc_close_thread_system (void)
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105 {
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106 if (__gthread_objc_data_tls != (DWORD) -1)
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107 TlsFree (__gthread_objc_data_tls);
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108 return 0;
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109 }
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110
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111 /* Backend thread functions */
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112
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113 /* Create a new thread of execution. */
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114 objc_thread_t
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115 __gthread_objc_thread_detach (void (*func)(void *arg), void *arg)
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116 {
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117 DWORD thread_id = 0;
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118 HANDLE win32_handle;
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119
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120 if (!(win32_handle = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) func,
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121 arg, 0, &thread_id)))
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122 thread_id = 0;
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123
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124 return (objc_thread_t) thread_id;
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125 }
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126
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127 /* Set the current thread's priority. */
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128 int
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129 __gthread_objc_thread_set_priority (int priority)
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130 {
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131 int sys_priority = 0;
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132
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133 switch (priority)
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134 {
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135 case OBJC_THREAD_INTERACTIVE_PRIORITY:
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136 sys_priority = THREAD_PRIORITY_NORMAL;
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137 break;
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138 default:
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139 case OBJC_THREAD_BACKGROUND_PRIORITY:
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140 sys_priority = THREAD_PRIORITY_BELOW_NORMAL;
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141 break;
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142 case OBJC_THREAD_LOW_PRIORITY:
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143 sys_priority = THREAD_PRIORITY_LOWEST;
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144 break;
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145 }
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146
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147 /* Change priority */
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148 if (SetThreadPriority (GetCurrentThread (), sys_priority))
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149 return 0;
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150 else
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151 return -1;
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152 }
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153
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154 /* Return the current thread's priority. */
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155 int
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156 __gthread_objc_thread_get_priority (void)
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157 {
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158 int sys_priority;
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159
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160 sys_priority = GetThreadPriority (GetCurrentThread ());
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161
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162 switch (sys_priority)
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163 {
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164 case THREAD_PRIORITY_HIGHEST:
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165 case THREAD_PRIORITY_TIME_CRITICAL:
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166 case THREAD_PRIORITY_ABOVE_NORMAL:
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167 case THREAD_PRIORITY_NORMAL:
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168 return OBJC_THREAD_INTERACTIVE_PRIORITY;
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169
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170 default:
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171 case THREAD_PRIORITY_BELOW_NORMAL:
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172 return OBJC_THREAD_BACKGROUND_PRIORITY;
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173
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174 case THREAD_PRIORITY_IDLE:
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175 case THREAD_PRIORITY_LOWEST:
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176 return OBJC_THREAD_LOW_PRIORITY;
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177 }
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178
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179 /* Couldn't get priority. */
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180 return -1;
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181 }
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182
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183 /* Yield our process time to another thread. */
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184 void
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185 __gthread_objc_thread_yield (void)
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186 {
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187 Sleep (0);
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188 }
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189
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190 /* Terminate the current thread. */
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191 int
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192 __gthread_objc_thread_exit (void)
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193 {
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194 /* exit the thread */
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195 ExitThread (__objc_thread_exit_status);
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196
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197 /* Failed if we reached here */
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198 return -1;
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199 }
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200
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201 /* Returns an integer value which uniquely describes a thread. */
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202 objc_thread_t
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203 __gthread_objc_thread_id (void)
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204 {
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205 return (objc_thread_t) GetCurrentThreadId ();
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206 }
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207
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208 /* Sets the thread's local storage pointer. */
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209 int
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210 __gthread_objc_thread_set_data (void *value)
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211 {
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212 if (TlsSetValue (__gthread_objc_data_tls, value))
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213 return 0;
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214 else
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215 return -1;
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216 }
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217
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218 /* Returns the thread's local storage pointer. */
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219 void *
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220 __gthread_objc_thread_get_data (void)
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221 {
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222 DWORD lasterror;
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223 void *ptr;
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224
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225 lasterror = GetLastError ();
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226
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227 ptr = TlsGetValue (__gthread_objc_data_tls); /* Return thread data. */
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228
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229 SetLastError (lasterror);
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230
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231 return ptr;
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232 }
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233
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234 /* Backend mutex functions */
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235
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236 /* Allocate a mutex. */
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237 int
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238 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
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239 {
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240 if ((mutex->backend = (void *) CreateMutex (NULL, 0, NULL)) == NULL)
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241 return -1;
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242 else
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243 return 0;
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244 }
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245
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246 /* Deallocate a mutex. */
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247 int
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248 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
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249 {
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250 CloseHandle ((HANDLE) (mutex->backend));
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251 return 0;
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252 }
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253
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254 /* Grab a lock on a mutex. */
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255 int
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256 __gthread_objc_mutex_lock (objc_mutex_t mutex)
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257 {
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258 int status;
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259
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260 status = WaitForSingleObject ((HANDLE) (mutex->backend), INFINITE);
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261 if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
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262 return -1;
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263 else
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264 return 0;
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265 }
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266
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267 /* Try to grab a lock on a mutex. */
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268 int
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269 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
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270 {
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271 int status;
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272
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273 status = WaitForSingleObject ((HANDLE) (mutex->backend), 0);
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274 if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
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275 return -1;
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276 else
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277 return 0;
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278 }
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279
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280 /* Unlock the mutex */
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281 int
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282 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
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283 {
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284 if (ReleaseMutex ((HANDLE) (mutex->backend)) == 0)
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285 return -1;
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286 else
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287 return 0;
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288 }
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289
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290 /* Backend condition mutex functions */
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291
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292 /* Allocate a condition. */
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293 int
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294 __gthread_objc_condition_allocate (objc_condition_t condition)
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295 {
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296 /* Unimplemented. */
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297 return -1;
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298 }
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299
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300 /* Deallocate a condition. */
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301 int
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302 __gthread_objc_condition_deallocate (objc_condition_t condition)
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303 {
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304 /* Unimplemented. */
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305 return -1;
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306 }
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307
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308 /* Wait on the condition */
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309 int
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310 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
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311 {
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312 /* Unimplemented. */
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313 return -1;
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314 }
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315
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316 /* Wake up all threads waiting on this condition. */
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317 int
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318 __gthread_objc_condition_broadcast (objc_condition_t condition)
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319 {
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320 /* Unimplemented. */
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321 return -1;
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322 }
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323
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324 /* Wake up one thread waiting on this condition. */
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325 int
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326 __gthread_objc_condition_signal (objc_condition_t condition)
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327 {
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328 /* Unimplemented. */
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329 return -1;
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330 }
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331
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332 #else /* _LIBOBJC */
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333
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334 #ifdef __cplusplus
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335 extern "C" {
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336 #endif
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337
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338 typedef unsigned long __gthread_key_t;
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339
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340 typedef struct {
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341 int done;
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342 long started;
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343 } __gthread_once_t;
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344
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345 typedef struct {
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346 long counter;
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347 void *sema;
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348 } __gthread_mutex_t;
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349
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350 typedef struct {
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351 long counter;
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352 long depth;
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353 unsigned long owner;
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354 void *sema;
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355 } __gthread_recursive_mutex_t;
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356
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357 #define __GTHREAD_ONCE_INIT {0, -1}
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358 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
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359 #define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0}
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360 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION \
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361 __gthread_recursive_mutex_init_function
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362 #define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0, 0, 0}
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363
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364 #if __MINGW32_MAJOR_VERSION >= 1 || \
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365 (__MINGW32_MAJOR_VERSION == 0 && __MINGW32_MINOR_VERSION > 2)
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366 #define MINGW32_SUPPORTS_MT_EH 1
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367 /* Mingw runtime >= v0.3 provides a magic variable that is set to nonzero
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368 if -mthreads option was specified, or 0 otherwise. This is to get around
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369 the lack of weak symbols in PE-COFF. */
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370 extern int _CRT_MT;
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371 extern int __mingwthr_key_dtor (unsigned long, void (*) (void *));
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372 #endif /* __MINGW32__ version */
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373
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374 /* The Windows95 kernel does not export InterlockedCompareExchange.
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375 This provides a substitute. When building apps that reference
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376 gthread_mutex_try_lock, the __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
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377 macro must be defined if Windows95 is a target. Currently
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378 gthread_mutex_try_lock is not referenced by libgcc or libstdc++. */
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379 #ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
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380 static inline long
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381 __gthr_i486_lock_cmp_xchg(long *__dest, long __xchg, long __comperand)
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382 {
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383 long result;
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384 __asm__ __volatile__ ("\n\
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385 lock\n\
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386 cmpxchg{l} {%4, %1|%1, %4}\n"
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387 : "=a" (result), "=m" (*__dest)
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388 : "0" (__comperand), "m" (*__dest), "r" (__xchg)
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389 : "cc");
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390 return result;
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391 }
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392 #define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg
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393 #else /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
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394 #define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange
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395 #endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
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396
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397 static inline int
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398 __gthread_active_p (void)
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399 {
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400 #ifdef MINGW32_SUPPORTS_MT_EH
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401 return _CRT_MT;
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402 #else
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403 return 1;
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404 #endif
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405 }
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406
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407 #if __GTHREAD_HIDE_WIN32API
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408
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409 /* The implementations are in config/i386/gthr-win32.c in libgcc.a.
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410 Only stubs are exposed to avoid polluting the C++ namespace with
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411 windows api definitions. */
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412
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413 extern int __gthr_win32_once (__gthread_once_t *, void (*) (void));
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414 extern int __gthr_win32_key_create (__gthread_key_t *, void (*) (void*));
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415 extern int __gthr_win32_key_delete (__gthread_key_t);
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416 extern void * __gthr_win32_getspecific (__gthread_key_t);
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417 extern int __gthr_win32_setspecific (__gthread_key_t, const void *);
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418 extern void __gthr_win32_mutex_init_function (__gthread_mutex_t *);
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419 extern int __gthr_win32_mutex_lock (__gthread_mutex_t *);
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420 extern int __gthr_win32_mutex_trylock (__gthread_mutex_t *);
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421 extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *);
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422 extern void
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423 __gthr_win32_recursive_mutex_init_function (__gthread_recursive_mutex_t *);
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424 extern int __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *);
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425 extern int
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426 __gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *);
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427 extern int __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *);
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428 extern void __gthr_win32_mutex_destroy (__gthread_mutex_t *);
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429
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430 static inline int
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431 __gthread_once (__gthread_once_t *__once, void (*__func) (void))
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432 {
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433 if (__gthread_active_p ())
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434 return __gthr_win32_once (__once, __func);
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435 else
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436 return -1;
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437 }
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438
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439 static inline int
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440 __gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
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441 {
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442 return __gthr_win32_key_create (__key, __dtor);
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443 }
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444
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445 static inline int
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446 __gthread_key_delete (__gthread_key_t __key)
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447 {
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448 return __gthr_win32_key_delete (__key);
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449 }
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450
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451 static inline void *
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452 __gthread_getspecific (__gthread_key_t __key)
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453 {
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454 return __gthr_win32_getspecific (__key);
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455 }
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456
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457 static inline int
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458 __gthread_setspecific (__gthread_key_t __key, const void *__ptr)
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459 {
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460 return __gthr_win32_setspecific (__key, __ptr);
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461 }
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462
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463 static inline void
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464 __gthread_mutex_init_function (__gthread_mutex_t *__mutex)
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465 {
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466 __gthr_win32_mutex_init_function (__mutex);
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467 }
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468
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469 static inline void
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470 __gthread_mutex_destroy (__gthread_mutex_t *__mutex)
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471 {
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472 __gthr_win32_mutex_destroy (__mutex);
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473 }
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474
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475 static inline int
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476 __gthread_mutex_lock (__gthread_mutex_t *__mutex)
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477 {
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478 if (__gthread_active_p ())
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479 return __gthr_win32_mutex_lock (__mutex);
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480 else
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481 return 0;
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482 }
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483
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484 static inline int
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485 __gthread_mutex_trylock (__gthread_mutex_t *__mutex)
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486 {
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487 if (__gthread_active_p ())
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488 return __gthr_win32_mutex_trylock (__mutex);
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489 else
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490 return 0;
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491 }
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492
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493 static inline int
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494 __gthread_mutex_unlock (__gthread_mutex_t *__mutex)
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495 {
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496 if (__gthread_active_p ())
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497 return __gthr_win32_mutex_unlock (__mutex);
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498 else
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499 return 0;
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500 }
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501
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502 static inline void
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503 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
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504 {
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505 __gthr_win32_recursive_mutex_init_function (__mutex);
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506 }
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507
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508 static inline int
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509 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
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510 {
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511 if (__gthread_active_p ())
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512 return __gthr_win32_recursive_mutex_lock (__mutex);
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513 else
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514 return 0;
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515 }
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516
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517 static inline int
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518 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
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519 {
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520 if (__gthread_active_p ())
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521 return __gthr_win32_recursive_mutex_trylock (__mutex);
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522 else
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523 return 0;
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524 }
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525
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526 static inline int
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527 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
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528 {
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529 if (__gthread_active_p ())
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530 return __gthr_win32_recursive_mutex_unlock (__mutex);
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531 else
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532 return 0;
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533 }
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534
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535 #else /* ! __GTHREAD_HIDE_WIN32API */
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536
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537 #include <windows.h>
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538 #include <errno.h>
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539
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540 static inline int
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541 __gthread_once (__gthread_once_t *__once, void (*__func) (void))
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542 {
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543 if (! __gthread_active_p ())
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544 return -1;
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545 else if (__once == NULL || __func == NULL)
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546 return EINVAL;
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547
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548 if (! __once->done)
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549 {
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550 if (InterlockedIncrement (&(__once->started)) == 0)
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551 {
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552 (*__func) ();
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553 __once->done = TRUE;
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554 }
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555 else
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556 {
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557 /* Another thread is currently executing the code, so wait for it
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558 to finish; yield the CPU in the meantime. If performance
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559 does become an issue, the solution is to use an Event that
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560 we wait on here (and set above), but that implies a place to
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561 create the event before this routine is called. */
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562 while (! __once->done)
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563 Sleep (0);
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564 }
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565 }
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566
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567 return 0;
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568 }
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569
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570 /* Windows32 thread local keys don't support destructors; this leads to
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571 leaks, especially in threaded applications making extensive use of
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572 C++ EH. Mingw uses a thread-support DLL to work-around this problem. */
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573 static inline int
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574 __gthread_key_create (__gthread_key_t *__key,
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575 void (*__dtor) (void *) __attribute__((unused)))
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576 {
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577 int __status = 0;
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578 DWORD __tls_index = TlsAlloc ();
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579 if (__tls_index != 0xFFFFFFFF)
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580 {
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581 *__key = __tls_index;
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582 #ifdef MINGW32_SUPPORTS_MT_EH
|
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583 /* Mingw runtime will run the dtors in reverse order for each thread
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584 when the thread exits. */
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|
585 __status = __mingwthr_key_dtor (*__key, __dtor);
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586 #endif
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|
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587 }
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588 else
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|
589 __status = (int) GetLastError ();
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590 return __status;
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|
591 }
|
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592
|
|
|
593 static inline int
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594 __gthread_key_delete (__gthread_key_t __key)
|
|
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595 {
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|
596 return (TlsFree (__key) != 0) ? 0 : (int) GetLastError ();
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|
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597 }
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|
|
598
|
|
|
599 static inline void *
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600 __gthread_getspecific (__gthread_key_t __key)
|
|
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601 {
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|
|
602 DWORD __lasterror;
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|
|
603 void *__ptr;
|
|
|
604
|
|
|
605 __lasterror = GetLastError ();
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|
|
606
|
|
|
607 __ptr = TlsGetValue (__key);
|
|
|
608
|
|
|
609 SetLastError (__lasterror);
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|
|
610
|
|
|
611 return __ptr;
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|
|
612 }
|
|
|
613
|
|
|
614 static inline int
|
|
|
615 __gthread_setspecific (__gthread_key_t __key, const void *__ptr)
|
|
|
616 {
|
|
|
617 if (TlsSetValue (__key, CONST_CAST2(void *, const void *, __ptr)) != 0)
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|
618 return 0;
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|
619 else
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|
|
620 return GetLastError ();
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|
|
621 }
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|
|
622
|
|
|
623 static inline void
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|
|
624 __gthread_mutex_init_function (__gthread_mutex_t *__mutex)
|
|
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625 {
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|
|
626 __mutex->counter = -1;
|
|
|
627 __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
|
|
|
628 }
|
|
|
629
|
|
|
630 static inline void
|
|
|
631 __gthread_mutex_destroy (__gthread_mutex_t *__mutex)
|
|
|
632 {
|
|
|
633 CloseHandle ((HANDLE) __mutex->sema);
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|
|
634 }
|
|
|
635
|
|
|
636 static inline int
|
|
|
637 __gthread_mutex_lock (__gthread_mutex_t *__mutex)
|
|
|
638 {
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|
|
639 int __status = 0;
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|
|
640
|
|
|
641 if (__gthread_active_p ())
|
|
|
642 {
|
|
|
643 if (InterlockedIncrement (&__mutex->counter) == 0 ||
|
|
|
644 WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
|
|
|
645 __status = 0;
|
|
|
646 else
|
|
|
647 {
|
|
|
648 /* WaitForSingleObject returns WAIT_FAILED, and we can only do
|
|
|
649 some best-effort cleanup here. */
|
|
|
650 InterlockedDecrement (&__mutex->counter);
|
|
|
651 __status = 1;
|
|
|
652 }
|
|
|
653 }
|
|
|
654 return __status;
|
|
|
655 }
|
|
|
656
|
|
|
657 static inline int
|
|
|
658 __gthread_mutex_trylock (__gthread_mutex_t *__mutex)
|
|
|
659 {
|
|
|
660 int __status = 0;
|
|
|
661
|
|
|
662 if (__gthread_active_p ())
|
|
|
663 {
|
|
|
664 if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
|
|
|
665 __status = 0;
|
|
|
666 else
|
|
|
667 __status = 1;
|
|
|
668 }
|
|
|
669 return __status;
|
|
|
670 }
|
|
|
671
|
|
|
672 static inline int
|
|
|
673 __gthread_mutex_unlock (__gthread_mutex_t *__mutex)
|
|
|
674 {
|
|
|
675 if (__gthread_active_p ())
|
|
|
676 {
|
|
|
677 if (InterlockedDecrement (&__mutex->counter) >= 0)
|
|
|
678 return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
|
|
|
679 }
|
|
|
680 return 0;
|
|
|
681 }
|
|
|
682
|
|
|
683 static inline void
|
|
|
684 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
|
|
|
685 {
|
|
|
686 __mutex->counter = -1;
|
|
|
687 __mutex->depth = 0;
|
|
|
688 __mutex->owner = 0;
|
|
|
689 __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
|
|
|
690 }
|
|
|
691
|
|
|
692 static inline int
|
|
|
693 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
|
|
|
694 {
|
|
|
695 if (__gthread_active_p ())
|
|
|
696 {
|
|
|
697 DWORD __me = GetCurrentThreadId();
|
|
|
698 if (InterlockedIncrement (&__mutex->counter) == 0)
|
|
|
699 {
|
|
|
700 __mutex->depth = 1;
|
|
|
701 __mutex->owner = __me;
|
|
|
702 }
|
|
|
703 else if (__mutex->owner == __me)
|
|
|
704 {
|
|
|
705 InterlockedDecrement (&__mutex->counter);
|
|
|
706 ++(__mutex->depth);
|
|
|
707 }
|
|
|
708 else if (WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
|
|
|
709 {
|
|
|
710 __mutex->depth = 1;
|
|
|
711 __mutex->owner = __me;
|
|
|
712 }
|
|
|
713 else
|
|
|
714 {
|
|
|
715 /* WaitForSingleObject returns WAIT_FAILED, and we can only do
|
|
|
716 some best-effort cleanup here. */
|
|
|
717 InterlockedDecrement (&__mutex->counter);
|
|
|
718 return 1;
|
|
|
719 }
|
|
|
720 }
|
|
|
721 return 0;
|
|
|
722 }
|
|
|
723
|
|
|
724 static inline int
|
|
|
725 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
|
|
|
726 {
|
|
|
727 if (__gthread_active_p ())
|
|
|
728 {
|
|
|
729 DWORD __me = GetCurrentThreadId();
|
|
|
730 if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
|
|
|
731 {
|
|
|
732 __mutex->depth = 1;
|
|
|
733 __mutex->owner = __me;
|
|
|
734 }
|
|
|
735 else if (__mutex->owner == __me)
|
|
|
736 ++(__mutex->depth);
|
|
|
737 else
|
|
|
738 return 1;
|
|
|
739 }
|
|
|
740 return 0;
|
|
|
741 }
|
|
|
742
|
|
|
743 static inline int
|
|
|
744 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
|
|
|
745 {
|
|
|
746 if (__gthread_active_p ())
|
|
|
747 {
|
|
|
748 --(__mutex->depth);
|
|
|
749 if (__mutex->depth == 0)
|
|
|
750 {
|
|
|
751 __mutex->owner = 0;
|
|
|
752
|
|
|
753 if (InterlockedDecrement (&__mutex->counter) >= 0)
|
|
|
754 return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
|
|
|
755 }
|
|
|
756 }
|
|
|
757 return 0;
|
|
|
758 }
|
|
|
759
|
|
|
760 #endif /* __GTHREAD_HIDE_WIN32API */
|
|
|
761
|
|
|
762 #ifdef __cplusplus
|
|
|
763 }
|
|
|
764 #endif
|
|
|
765
|
|
|
766 #endif /* _LIBOBJC */
|
|
|
767
|
|
|
768 #endif /* ! GCC_GTHR_WIN32_H */
|
