Mercurial > cpython-lru_cache-weakref

annotate Python/thread_nt.h @ 22621:830c829a7eb2 legacy-trunk

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Fix an issue that was reported in but unrelated to the main problem of SF bug 535905 (Evil Trashcan and GC interaction). The SETLOCAL() macro should not DECREF the local variable in-place and then store the new value; it should copy the old value to a temporary value, then store the new value, and then DECREF the temporary value. This is because it is possible that during the DECREF the frame is accessed by other code (e.g. a __del__ method or gc.collect()) and the variable would be pointing to already-freed memory. BUGFIX CANDIDATE!
author Guido van Rossum <guido@python.org>
date Thu, 28 Mar 2002 20:17:52 +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
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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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diff changeset
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"));
2152
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266 if (!initialized)
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267 PyThread_init_thread();
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268
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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 }