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annotate Python/thread_nt.h @ 38579:19430cdff2bd legacy-trunk

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clean up function declarations to conform to PEP-7 style.
author Andrew MacIntyre <andymac@bullseye.apana.org.au>
date Sun, 04 Jun 2006 12:59:59 +0000
parents 0b2b076e5908
children c4587a5f5e94
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1
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2 /* This code implemented by Dag.Gruneau@elsa.preseco.comm.se */
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3 /* Fast NonRecursiveMutex support by Yakov Markovitch, markovitch@iso.ru */
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4 /* Eliminated some memory leaks, gsw@agere.com */
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5
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6 #include <windows.h>
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7 #include <limits.h>
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8 #include <process.h>
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9
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10 typedef struct NRMUTEX {
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11 LONG owned ;
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12 DWORD thread_id ;
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13 HANDLE hevent ;
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14 } NRMUTEX, *PNRMUTEX ;
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15
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16 typedef PVOID WINAPI interlocked_cmp_xchg_t(PVOID *dest, PVOID exc, PVOID comperand) ;
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17
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18 /* Sorry mate, but we haven't got InterlockedCompareExchange in Win95! */
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19 static PVOID WINAPI
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20 interlocked_cmp_xchg(PVOID *dest, PVOID exc, PVOID comperand)
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21 {
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22 static LONG spinlock = 0 ;
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23 PVOID result ;
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24 DWORD dwSleep = 0;
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25
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26 /* Acqire spinlock (yielding control to other threads if cant aquire for the moment) */
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27 while(InterlockedExchange(&spinlock, 1))
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28 {
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29 // Using Sleep(0) can cause a priority inversion.
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30 // Sleep(0) only yields the processor if there's
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31 // another thread of the same priority that's
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32 // ready to run. If a high-priority thread is
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33 // trying to acquire the lock, which is held by
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34 // a low-priority thread, then the low-priority
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35 // thread may never get scheduled and hence never
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36 // free the lock. NT attempts to avoid priority
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37 // inversions by temporarily boosting the priority
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38 // of low-priority runnable threads, but the problem
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39 // can still occur if there's a medium-priority
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40 // thread that's always runnable. If Sleep(1) is used,
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41 // then the thread unconditionally yields the CPU. We
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42 // only do this for the second and subsequent even
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43 // iterations, since a millisecond is a long time to wait
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44 // if the thread can be scheduled in again sooner
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45 // (~100,000 instructions).
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46 // Avoid priority inversion: 0, 1, 0, 1,...
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47 Sleep(dwSleep);
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48 dwSleep = !dwSleep;
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49 }
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50 result = *dest ;
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51 if (result == comperand)
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52 *dest = exc ;
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53 /* Release spinlock */
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54 spinlock = 0 ;
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55 return result ;
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56 } ;
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57
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58 static interlocked_cmp_xchg_t *ixchg;
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59
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60 BOOL
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61 InitializeNonRecursiveMutex(PNRMUTEX mutex)
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62 {
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63 if (!ixchg)
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64 {
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65 /* Sorely, Win95 has no InterlockedCompareExchange API (Win98 has), so we have to use emulation */
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66 HANDLE kernel = GetModuleHandle("kernel32.dll") ;
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67 if (!kernel || (ixchg = (interlocked_cmp_xchg_t *)GetProcAddress(kernel, "InterlockedCompareExchange")) == NULL)
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68 ixchg = interlocked_cmp_xchg ;
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69 }
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70
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71 mutex->owned = -1 ; /* No threads have entered NonRecursiveMutex */
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72 mutex->thread_id = 0 ;
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73 mutex->hevent = CreateEvent(NULL, FALSE, FALSE, NULL) ;
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74 return mutex->hevent != NULL ; /* TRUE if the mutex is created */
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75 }
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76
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77 #ifdef InterlockedCompareExchange
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78 #undef InterlockedCompareExchange
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79 #endif
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80 #define InterlockedCompareExchange(dest,exchange,comperand) (ixchg((dest), (exchange), (comperand)))
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81
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82 VOID
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83 DeleteNonRecursiveMutex(PNRMUTEX mutex)
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84 {
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85 /* No in-use check */
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86 CloseHandle(mutex->hevent) ;
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87 mutex->hevent = NULL ; /* Just in case */
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88 }
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89
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90 DWORD
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91 EnterNonRecursiveMutex(PNRMUTEX mutex, BOOL wait)
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92 {
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93 /* Assume that the thread waits successfully */
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94 DWORD ret ;
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95
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96 /* InterlockedIncrement(&mutex->owned) == 0 means that no thread currently owns the mutex */
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97 if (!wait)
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98 {
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99 if (InterlockedCompareExchange((PVOID *)&mutex->owned, (PVOID)0, (PVOID)-1) != (PVOID)-1)
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100 return WAIT_TIMEOUT ;
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101 ret = WAIT_OBJECT_0 ;
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102 }
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103 else
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104 ret = InterlockedIncrement(&mutex->owned) ?
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105 /* Some thread owns the mutex, let's wait... */
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106 WaitForSingleObject(mutex->hevent, INFINITE) : WAIT_OBJECT_0 ;
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107
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108 mutex->thread_id = GetCurrentThreadId() ; /* We own it */
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109 return ret ;
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110 }
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111
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112 BOOL
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113 LeaveNonRecursiveMutex(PNRMUTEX mutex)
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114 {
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115 /* We don't own the mutex */
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116 mutex->thread_id = 0 ;
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117 return
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118 InterlockedDecrement(&mutex->owned) < 0 ||
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119 SetEvent(mutex->hevent) ; /* Other threads are waiting, wake one on them up */
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120 }
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121
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122 PNRMUTEX
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123 AllocNonRecursiveMutex(void)
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124 {
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125 PNRMUTEX mutex = (PNRMUTEX)malloc(sizeof(NRMUTEX)) ;
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126 if (mutex && !InitializeNonRecursiveMutex(mutex))
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127 {
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128 free(mutex) ;
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129 mutex = NULL ;
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130 }
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131 return mutex ;
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132 }
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133
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134 void
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135 FreeNonRecursiveMutex(PNRMUTEX mutex)
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136 {
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137 if (mutex)
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138 {
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139 DeleteNonRecursiveMutex(mutex) ;
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140 free(mutex) ;
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141 }
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142 }
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143
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144 long PyThread_get_thread_ident(void);
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145
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146 /*
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147 * Initialization of the C package, should not be needed.
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148 */
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149 static void
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150 PyThread__init_thread(void)
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151 {
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152 }
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153
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154 /*
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155 * Thread support.
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156 */
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157
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158 typedef struct {
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159 void (*func)(void*);
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160 void *arg;
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161 long id;
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162 HANDLE done;
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163 } callobj;
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164
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165 static int
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166 bootstrap(void *call)
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167 {
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168 callobj *obj = (callobj*)call;
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169 /* copy callobj since other thread might free it before we're done */
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170 void (*func)(void*) = obj->func;
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171 void *arg = obj->arg;
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172
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173 obj->id = PyThread_get_thread_ident();
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174 ReleaseSemaphore(obj->done, 1, NULL);
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175 func(arg);
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176 return 0;
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177 }
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178
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179 long
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180 PyThread_start_new_thread(void (*func)(void *), void *arg)
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181 {
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182 Py_uintptr_t rv;
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183 callobj obj;
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184
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185 dprintf(("%ld: PyThread_start_new_thread called\n",
59da5b57c61b An Anonymous Coward on c.l.py posted a little program with bizarre
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186 PyThread_get_thread_ident()));
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187 if (!initialized)
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188 PyThread_init_thread();
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189
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190 obj.id = -1; /* guilty until proved innocent */
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191 obj.func = func;
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192 obj.arg = arg;
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193 obj.done = CreateSemaphore(NULL, 0, 1, NULL);
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194 if (obj.done == NULL)
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195 return -1;
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196
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197 rv = _beginthread(bootstrap, _pythread_stacksize, &obj);
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198 if (rv == (Py_uintptr_t)-1) {
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199 /* I've seen errno == EAGAIN here, which means "there are
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200 * too many threads".
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201 */
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202 dprintf(("%ld: PyThread_start_new_thread failed: %p errno %d\n",
59da5b57c61b An Anonymous Coward on c.l.py posted a little program with bizarre
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203 PyThread_get_thread_ident(), rv, errno));
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204 obj.id = -1;
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205 }
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206 else {
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207 dprintf(("%ld: PyThread_start_new_thread succeeded: %p\n",
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208 PyThread_get_thread_ident(), rv));
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209 /* wait for thread to initialize, so we can get its id */
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210 WaitForSingleObject(obj.done, INFINITE);
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211 assert(obj.id != -1);
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212 }
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213 CloseHandle((HANDLE)obj.done);
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214 return obj.id;
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215 }
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216
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217 /*
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218 * Return the thread Id instead of an handle. The Id is said to uniquely identify the
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219 * thread in the system
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220 */
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221 long
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222 PyThread_get_thread_ident(void)
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223 {
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224 if (!initialized)
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225 PyThread_init_thread();
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226
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227 return GetCurrentThreadId();
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228 }
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229
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230 static void
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231 do_PyThread_exit_thread(int no_cleanup)
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232 {
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233 dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
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234 if (!initialized)
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235 if (no_cleanup)
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236 _exit(0);
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237 else
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238 exit(0);
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239 _endthread();
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240 }
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241
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242 void
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243 PyThread_exit_thread(void)
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244 {
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245 do_PyThread_exit_thread(0);
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246 }
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247
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248 void
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249 PyThread__exit_thread(void)
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250 {
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251 do_PyThread_exit_thread(1);
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252 }
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253
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254 #ifndef NO_EXIT_PROG
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255 static void
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256 do_PyThread_exit_prog(int status, int no_cleanup)
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257 {
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258 dprintf(("PyThread_exit_prog(%d) called\n", status));
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259 if (!initialized)
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260 if (no_cleanup)
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261 _exit(status);
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262 else
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263 exit(status);
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264 }
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265
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266 void
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267 PyThread_exit_prog(int status)
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268 {
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269 do_PyThread_exit_prog(status, 0);
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270 }
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271
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272 void
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273 PyThread__exit_prog(int status)
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274 {
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275 do_PyThread_exit_prog(status, 1);
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276 }
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277 #endif /* NO_EXIT_PROG */
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278
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279 /*
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280 * Lock support. It has too be implemented as semaphores.
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281 * I [Dag] tried to implement it with mutex but I could find a way to
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282 * tell whether a thread already own the lock or not.
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283 */
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284 PyThread_type_lock
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285 PyThread_allocate_lock(void)
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286 {
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287 PNRMUTEX aLock;
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288
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289 dprintf(("PyThread_allocate_lock called\n"));
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290 if (!initialized)
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291 PyThread_init_thread();
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292
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293 aLock = AllocNonRecursiveMutex() ;
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294
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295 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
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296
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297 return (PyThread_type_lock) aLock;
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298 }
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299
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300 void
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301 PyThread_free_lock(PyThread_type_lock aLock)
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302 {
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303 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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304
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305 FreeNonRecursiveMutex(aLock) ;
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306 }
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307
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308 /*
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309 * Return 1 on success if the lock was acquired
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310 *
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311 * and 0 if the lock was not acquired. This means a 0 is returned
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312 * if the lock has already been acquired by this thread!
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313 */
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314 int
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315 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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316 {
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317 int success ;
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318
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319 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
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320
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321 success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag ? INFINITE : 0)) == WAIT_OBJECT_0 ;
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322
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323 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));
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324
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325 return success;
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326 }
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327
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328 void
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329 PyThread_release_lock(PyThread_type_lock aLock)
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330 {
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331 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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332
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333 if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
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334 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n", PyThread_get_thread_ident(), aLock, GetLastError()));
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335 }
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336
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337 /* minimum/maximum thread stack sizes supported */
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338 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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339 #define THREAD_MAX_STACKSIZE 0x10000000 /* 256MB */
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340
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341 /* set the thread stack size.
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342 * Return 1 if an exception is pending, 0 otherwise.
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343 */
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344 static int
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345 _pythread_nt_set_stacksize(size_t size)
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346 {
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347 /* set to default */
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348 if (size == 0) {
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349 _pythread_stacksize = 0;
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350 return 0;
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351 }
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352
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353 /* valid range? */
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354 if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
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355 _pythread_stacksize = size;
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356 return 0;
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357 }
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358 else {
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359 char warning[128];
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360 snprintf(warning,
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361 128,
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362 "thread stack size of %#x bytes not supported on Win32",
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363 size);
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364 return PyErr_Warn(PyExc_RuntimeWarning, warning);
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365 }
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366 }
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367
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368 #undef THREAD_SET_STACKSIZE
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369 #define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)