Mercurial > cpython-lru_cache-weakref

annotate Python/thread_nt.h @ 24042:63fbbed10714 legacy-trunk

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Simplify HTTPSConnection constructor. See discussion in SF bug 458463.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Fri, 28 Jun 2002 23:38:14 +0000
parents 7a3e03b541ff
children 59da5b57c61b
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1a52351a00b2 nt thread support
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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 interlocked_cmp_xchg(PVOID *dest, PVOID exc, PVOID comperand)
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20 {
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21 static LONG spinlock = 0 ;
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22 PVOID result ;
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23 DWORD dwSleep = 0;
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24
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25 /* Acqire spinlock (yielding control to other threads if cant aquire for the moment) */
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26 while(InterlockedExchange(&spinlock, 1))
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27 {
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28 // Using Sleep(0) can cause a priority inversion.
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29 // Sleep(0) only yields the processor if there's
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30 // another thread of the same priority that's
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31 // ready to run. If a high-priority thread is
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32 // trying to acquire the lock, which is held by
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33 // a low-priority thread, then the low-priority
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34 // thread may never get scheduled and hence never
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35 // free the lock. NT attempts to avoid priority
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36 // inversions by temporarily boosting the priority
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37 // of low-priority runnable threads, but the problem
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38 // can still occur if there's a medium-priority
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39 // thread that's always runnable. If Sleep(1) is used,
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40 // then the thread unconditionally yields the CPU. We
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41 // only do this for the second and subsequent even
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42 // iterations, since a millisecond is a long time to wait
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43 // if the thread can be scheduled in again sooner
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44 // (~100,000 instructions).
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45 // Avoid priority inversion: 0, 1, 0, 1,...
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46 Sleep(dwSleep);
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47 dwSleep = !dwSleep;
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48 }
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49 result = *dest ;
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50 if (result == comperand)
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51 *dest = exc ;
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52 /* Release spinlock */
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53 spinlock = 0 ;
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54 return result ;
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55 } ;
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56
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57 static interlocked_cmp_xchg_t *ixchg ;
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58 BOOL InitializeNonRecursiveMutex(PNRMUTEX mutex)
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59 {
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60 if (!ixchg)
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61 {
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62 /* Sorely, Win95 has no InterlockedCompareExchange API (Win98 has), so we have to use emulation */
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63 HANDLE kernel = GetModuleHandle("kernel32.dll") ;
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64 if (!kernel || (ixchg = (interlocked_cmp_xchg_t *)GetProcAddress(kernel, "InterlockedCompareExchange")) == NULL)
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65 ixchg = interlocked_cmp_xchg ;
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66 }
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67
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68 mutex->owned = -1 ; /* No threads have entered NonRecursiveMutex */
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69 mutex->thread_id = 0 ;
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70 mutex->hevent = CreateEvent(NULL, FALSE, FALSE, NULL) ;
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71 return mutex->hevent != NULL ; /* TRUE if the mutex is created */
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72 }
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73
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74 #ifdef InterlockedCompareExchange
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75 #undef InterlockedCompareExchange
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76 #endif
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77 #define InterlockedCompareExchange(dest,exchange,comperand) (ixchg((dest), (exchange), (comperand)))
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78
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79 VOID DeleteNonRecursiveMutex(PNRMUTEX mutex)
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80 {
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81 /* No in-use check */
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82 CloseHandle(mutex->hevent) ;
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83 mutex->hevent = NULL ; /* Just in case */
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84 }
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85
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86 DWORD EnterNonRecursiveMutex(PNRMUTEX mutex, BOOL wait)
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87 {
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88 /* Assume that the thread waits successfully */
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89 DWORD ret ;
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90
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91 /* InterlockedIncrement(&mutex->owned) == 0 means that no thread currently owns the mutex */
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92 if (!wait)
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93 {
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94 if (InterlockedCompareExchange((PVOID *)&mutex->owned, (PVOID)0, (PVOID)-1) != (PVOID)-1)
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95 return WAIT_TIMEOUT ;
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96 ret = WAIT_OBJECT_0 ;
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97 }
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98 else
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99 ret = InterlockedIncrement(&mutex->owned) ?
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100 /* Some thread owns the mutex, let's wait... */
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101 WaitForSingleObject(mutex->hevent, INFINITE) : WAIT_OBJECT_0 ;
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102
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103 mutex->thread_id = GetCurrentThreadId() ; /* We own it */
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104 return ret ;
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105 }
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106
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107 BOOL LeaveNonRecursiveMutex(PNRMUTEX mutex)
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108 {
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109 /* We don't own the mutex */
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110 mutex->thread_id = 0 ;
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111 return
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112 InterlockedDecrement(&mutex->owned) < 0 ||
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113 SetEvent(mutex->hevent) ; /* Other threads are waiting, wake one on them up */
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114 }
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115
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116 PNRMUTEX AllocNonRecursiveMutex(void)
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117 {
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118 PNRMUTEX mutex = (PNRMUTEX)malloc(sizeof(NRMUTEX)) ;
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119 if (mutex && !InitializeNonRecursiveMutex(mutex))
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120 {
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121 free(mutex) ;
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122 mutex = NULL ;
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123 }
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124 return mutex ;
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125 }
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126
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127 void FreeNonRecursiveMutex(PNRMUTEX mutex)
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128 {
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129 if (mutex)
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130 {
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131 DeleteNonRecursiveMutex(mutex) ;
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132 free(mutex) ;
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133 }
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134 }
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135
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136 long PyThread_get_thread_ident(void);
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137
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138 /*
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139 * Initialization of the C package, should not be needed.
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140 */
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141 static void PyThread__init_thread(void)
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142 {
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143 }
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144
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145 /*
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146 * Thread support.
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147 */
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148
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149 typedef struct {
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150 void (*func)(void*);
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151 void *arg;
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152 long id;
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153 HANDLE done;
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154 } callobj;
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155
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156 static int
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157 bootstrap(void *call)
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158 {
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159 callobj *obj = (callobj*)call;
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160 /* copy callobj since other thread might free it before we're done */
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161 void (*func)(void*) = obj->func;
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162 void *arg = obj->arg;
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163
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164 obj->id = PyThread_get_thread_ident();
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165 ReleaseSemaphore(obj->done, 1, NULL);
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166 func(arg);
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167 return 0;
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168 }
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169
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170 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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171 {
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172 unsigned long rv;
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173 int success = 0;
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174 callobj *obj;
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175 int id;
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176
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177 dprintf(("%ld: PyThread_start_new_thread called\n", PyThread_get_thread_ident()));
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178 if (!initialized)
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179 PyThread_init_thread();
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180
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181 obj = malloc(sizeof(callobj));
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182 obj->func = func;
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183 obj->arg = arg;
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184 obj->done = CreateSemaphore(NULL, 0, 1, NULL);
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185
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186 rv = _beginthread(bootstrap, 0, obj); /* use default stack size */
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187
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188 if (rv != (unsigned long)-1) {
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189 success = 1;
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190 dprintf(("%ld: PyThread_start_new_thread succeeded: %p\n", PyThread_get_thread_ident(), rv));
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191 }
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192
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193 /* wait for thread to initialize and retrieve id */
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194 WaitForSingleObject(obj->done, 5000); /* maybe INFINITE instead of 5000? */
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195 CloseHandle((HANDLE)obj->done);
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196 id = obj->id;
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197 free(obj);
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198 return id;
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199 }
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200
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201 /*
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202 * Return the thread Id instead of an handle. The Id is said to uniquely identify the
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203 * thread in the system
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204 */
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205 long PyThread_get_thread_ident(void)
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206 {
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207 if (!initialized)
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208 PyThread_init_thread();
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209
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210 return GetCurrentThreadId();
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211 }
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212
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213 static void do_PyThread_exit_thread(int no_cleanup)
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214 {
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215 dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
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216 if (!initialized)
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217 if (no_cleanup)
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218 _exit(0);
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219 else
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220 exit(0);
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221 _endthread();
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222 }
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223
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224 void PyThread_exit_thread(void)
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225 {
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226 do_PyThread_exit_thread(0);
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227 }
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228
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229 void PyThread__exit_thread(void)
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230 {
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231 do_PyThread_exit_thread(1);
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232 }
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233
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234 #ifndef NO_EXIT_PROG
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235 static void do_PyThread_exit_prog(int status, int no_cleanup)
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236 {
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237 dprintf(("PyThread_exit_prog(%d) called\n", status));
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238 if (!initialized)
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239 if (no_cleanup)
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240 _exit(status);
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241 else
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242 exit(status);
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243 }
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244
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245 void PyThread_exit_prog(int status)
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246 {
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247 do_PyThread_exit_prog(status, 0);
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248 }
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249
13658
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Thomas Wouters <thomas@python.org>
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250 void PyThread__exit_prog(int status)
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251 {
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252 do_PyThread_exit_prog(status, 1);
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253 }
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254 #endif /* NO_EXIT_PROG */
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255
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256 /*
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257 * Lock support. It has too be implemented as semaphores.
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258 * I [Dag] tried to implement it with mutex but I could find a way to
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259 * tell whether a thread already own the lock or not.
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260 */
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261 PyThread_type_lock PyThread_allocate_lock(void)
2152
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262 {
12584
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263 PNRMUTEX aLock;
2152
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264
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265 dprintf(("PyThread_allocate_lock called\n"));
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266 if (!initialized)
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267 PyThread_init_thread();
2152
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268
12584
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269 aLock = AllocNonRecursiveMutex() ;
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270
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271 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
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272
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273 return (PyThread_type_lock) aLock;
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274 }
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275
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276 void PyThread_free_lock(PyThread_type_lock aLock)
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277 {
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278 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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279
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280 FreeNonRecursiveMutex(aLock) ;
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281 }
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282
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283 /*
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284 * Return 1 on success if the lock was acquired
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285 *
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286 * and 0 if the lock was not acquired. This means a 0 is returned
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287 * if the lock has already been acquired by this thread!
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288 */
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289 int PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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290 {
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291 int success ;
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292
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293 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
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294
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295 success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag == 1 ? INFINITE : 0)) == WAIT_OBJECT_0 ;
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296
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297 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));
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298
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299 return success;
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300 }
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301
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302 void PyThread_release_lock(PyThread_type_lock aLock)
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303 {
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304 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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305
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306 if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
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307 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n", PyThread_get_thread_ident(), aLock, GetLastError()));
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308 }