Mercurial > cpython-lru_cache-weakref

annotate Python/thread_nt.h @ 39857:c10a71cf16e4 2.5 v2.5

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Preparing for 2.5 final. (damn, it's nice to see the line #define PY_VERSION "2.5" in patchlevel.h)
author Anthony Baxter <anthonybaxter@gmail.com>
date Mon, 18 Sep 2006 06:51:50 +0000
parents f7d23bca599f
children b68272449df4
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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 #ifdef HAVE_PROCESS_H
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9 #include <process.h>
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10 #endif
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11
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12 typedef struct NRMUTEX {
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13 LONG owned ;
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14 DWORD thread_id ;
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15 HANDLE hevent ;
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16 } NRMUTEX, *PNRMUTEX ;
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17
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18 typedef PVOID WINAPI interlocked_cmp_xchg_t(PVOID *dest, PVOID exc, PVOID comperand) ;
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19
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20 /* Sorry mate, but we haven't got InterlockedCompareExchange in Win95! */
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21 static PVOID WINAPI
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22 interlocked_cmp_xchg(PVOID *dest, PVOID exc, PVOID comperand)
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23 {
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24 static LONG spinlock = 0 ;
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25 PVOID result ;
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26 DWORD dwSleep = 0;
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27
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28 /* Acqire spinlock (yielding control to other threads if cant aquire for the moment) */
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29 while(InterlockedExchange(&spinlock, 1))
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30 {
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31 // Using Sleep(0) can cause a priority inversion.
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32 // Sleep(0) only yields the processor if there's
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33 // another thread of the same priority that's
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34 // ready to run. If a high-priority thread is
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35 // trying to acquire the lock, which is held by
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36 // a low-priority thread, then the low-priority
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37 // thread may never get scheduled and hence never
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38 // free the lock. NT attempts to avoid priority
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39 // inversions by temporarily boosting the priority
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40 // of low-priority runnable threads, but the problem
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41 // can still occur if there's a medium-priority
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42 // thread that's always runnable. If Sleep(1) is used,
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43 // then the thread unconditionally yields the CPU. We
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44 // only do this for the second and subsequent even
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45 // iterations, since a millisecond is a long time to wait
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46 // if the thread can be scheduled in again sooner
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47 // (~100,000 instructions).
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48 // Avoid priority inversion: 0, 1, 0, 1,...
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49 Sleep(dwSleep);
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50 dwSleep = !dwSleep;
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51 }
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52 result = *dest ;
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53 if (result == comperand)
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54 *dest = exc ;
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55 /* Release spinlock */
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56 spinlock = 0 ;
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57 return result ;
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58 } ;
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59
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60 static interlocked_cmp_xchg_t *ixchg;
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61
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62 BOOL
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63 InitializeNonRecursiveMutex(PNRMUTEX mutex)
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64 {
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65 if (!ixchg)
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66 {
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67 /* Sorely, Win95 has no InterlockedCompareExchange API (Win98 has), so we have to use emulation */
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68 HANDLE kernel = GetModuleHandle("kernel32.dll") ;
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69 if (!kernel || (ixchg = (interlocked_cmp_xchg_t *)GetProcAddress(kernel, "InterlockedCompareExchange")) == NULL)
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70 ixchg = interlocked_cmp_xchg ;
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71 }
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72
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73 mutex->owned = -1 ; /* No threads have entered NonRecursiveMutex */
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74 mutex->thread_id = 0 ;
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75 mutex->hevent = CreateEvent(NULL, FALSE, FALSE, NULL) ;
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76 return mutex->hevent != NULL ; /* TRUE if the mutex is created */
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77 }
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78
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79 #ifdef InterlockedCompareExchange
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80 #undef InterlockedCompareExchange
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81 #endif
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82 #define InterlockedCompareExchange(dest,exchange,comperand) (ixchg((dest), (exchange), (comperand)))
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83
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84 VOID
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85 DeleteNonRecursiveMutex(PNRMUTEX mutex)
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86 {
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87 /* No in-use check */
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88 CloseHandle(mutex->hevent) ;
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89 mutex->hevent = NULL ; /* Just in case */
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90 }
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91
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92 DWORD
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93 EnterNonRecursiveMutex(PNRMUTEX mutex, BOOL wait)
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94 {
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95 /* Assume that the thread waits successfully */
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96 DWORD ret ;
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97
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98 /* InterlockedIncrement(&mutex->owned) == 0 means that no thread currently owns the mutex */
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99 if (!wait)
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100 {
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101 if (InterlockedCompareExchange((PVOID *)&mutex->owned, (PVOID)0, (PVOID)-1) != (PVOID)-1)
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102 return WAIT_TIMEOUT ;
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103 ret = WAIT_OBJECT_0 ;
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104 }
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105 else
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106 ret = InterlockedIncrement(&mutex->owned) ?
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107 /* Some thread owns the mutex, let's wait... */
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108 WaitForSingleObject(mutex->hevent, INFINITE) : WAIT_OBJECT_0 ;
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109
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110 mutex->thread_id = GetCurrentThreadId() ; /* We own it */
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111 return ret ;
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112 }
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113
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114 BOOL
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115 LeaveNonRecursiveMutex(PNRMUTEX mutex)
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116 {
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117 /* We don't own the mutex */
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118 mutex->thread_id = 0 ;
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119 return
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120 InterlockedDecrement(&mutex->owned) < 0 ||
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121 SetEvent(mutex->hevent) ; /* Other threads are waiting, wake one on them up */
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122 }
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123
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124 PNRMUTEX
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125 AllocNonRecursiveMutex(void)
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126 {
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127 PNRMUTEX mutex = (PNRMUTEX)malloc(sizeof(NRMUTEX)) ;
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128 if (mutex && !InitializeNonRecursiveMutex(mutex))
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129 {
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130 free(mutex) ;
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131 mutex = NULL ;
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132 }
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133 return mutex ;
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134 }
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135
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136 void
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137 FreeNonRecursiveMutex(PNRMUTEX mutex)
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138 {
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139 if (mutex)
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140 {
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141 DeleteNonRecursiveMutex(mutex) ;
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142 free(mutex) ;
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143 }
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144 }
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145
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146 long PyThread_get_thread_ident(void);
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147
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148 /*
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149 * Initialization of the C package, should not be needed.
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150 */
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151 static void
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152 PyThread__init_thread(void)
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153 {
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154 }
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155
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156 /*
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157 * Thread support.
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158 */
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159
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160 typedef struct {
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161 void (*func)(void*);
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162 void *arg;
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163 long id;
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164 HANDLE done;
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165 } callobj;
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166
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167 static int
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168 bootstrap(void *call)
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169 {
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170 callobj *obj = (callobj*)call;
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171 /* copy callobj since other thread might free it before we're done */
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172 void (*func)(void*) = obj->func;
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173 void *arg = obj->arg;
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174
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175 obj->id = PyThread_get_thread_ident();
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176 ReleaseSemaphore(obj->done, 1, NULL);
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177 func(arg);
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178 return 0;
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179 }
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180
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181 long
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182 PyThread_start_new_thread(void (*func)(void *), void *arg)
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183 {
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184 Py_uintptr_t rv;
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185 callobj obj;
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186
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187 dprintf(("%ld: PyThread_start_new_thread called\n",
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188 PyThread_get_thread_ident()));
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189 if (!initialized)
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190 PyThread_init_thread();
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191
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192 obj.id = -1; /* guilty until proved innocent */
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193 obj.func = func;
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194 obj.arg = arg;
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195 obj.done = CreateSemaphore(NULL, 0, 1, NULL);
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196 if (obj.done == NULL)
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197 return -1;
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198
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199 rv = _beginthread(bootstrap, _pythread_stacksize, &obj);
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200 if (rv == (Py_uintptr_t)-1) {
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201 /* I've seen errno == EAGAIN here, which means "there are
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202 * too many threads".
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203 */
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204 dprintf(("%ld: PyThread_start_new_thread failed: %p errno %d\n",
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205 PyThread_get_thread_ident(), rv, errno));
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206 obj.id = -1;
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207 }
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208 else {
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209 dprintf(("%ld: PyThread_start_new_thread succeeded: %p\n",
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210 PyThread_get_thread_ident(), rv));
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211 /* wait for thread to initialize, so we can get its id */
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212 WaitForSingleObject(obj.done, INFINITE);
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213 assert(obj.id != -1);
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214 }
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215 CloseHandle((HANDLE)obj.done);
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216 return obj.id;
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217 }
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218
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219 /*
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220 * Return the thread Id instead of an handle. The Id is said to uniquely identify the
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221 * thread in the system
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222 */
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223 long
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224 PyThread_get_thread_ident(void)
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225 {
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226 if (!initialized)
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227 PyThread_init_thread();
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228
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229 return GetCurrentThreadId();
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230 }
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231
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232 static void
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233 do_PyThread_exit_thread(int no_cleanup)
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234 {
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235 dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
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236 if (!initialized)
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237 if (no_cleanup)
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238 _exit(0);
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239 else
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240 exit(0);
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241 _endthread();
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242 }
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243
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244 void
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245 PyThread_exit_thread(void)
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246 {
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247 do_PyThread_exit_thread(0);
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248 }
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249
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250 void
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251 PyThread__exit_thread(void)
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252 {
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253 do_PyThread_exit_thread(1);
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254 }
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255
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256 #ifndef NO_EXIT_PROG
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257 static void
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258 do_PyThread_exit_prog(int status, int no_cleanup)
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259 {
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260 dprintf(("PyThread_exit_prog(%d) called\n", status));
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261 if (!initialized)
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262 if (no_cleanup)
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263 _exit(status);
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264 else
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265 exit(status);
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266 }
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267
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268 void
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269 PyThread_exit_prog(int status)
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270 {
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271 do_PyThread_exit_prog(status, 0);
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272 }
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273
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274 void
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275 PyThread__exit_prog(int status)
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276 {
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277 do_PyThread_exit_prog(status, 1);
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278 }
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279 #endif /* NO_EXIT_PROG */
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280
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281 /*
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282 * Lock support. It has too be implemented as semaphores.
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283 * I [Dag] tried to implement it with mutex but I could find a way to
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284 * tell whether a thread already own the lock or not.
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285 */
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286 PyThread_type_lock
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287 PyThread_allocate_lock(void)
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288 {
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289 PNRMUTEX aLock;
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290
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291 dprintf(("PyThread_allocate_lock called\n"));
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292 if (!initialized)
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293 PyThread_init_thread();
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294
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295 aLock = AllocNonRecursiveMutex() ;
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296
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297 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
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298
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299 return (PyThread_type_lock) aLock;
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300 }
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301
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302 void
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303 PyThread_free_lock(PyThread_type_lock aLock)
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304 {
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305 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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306
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307 FreeNonRecursiveMutex(aLock) ;
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308 }
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309
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310 /*
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311 * Return 1 on success if the lock was acquired
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312 *
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313 * and 0 if the lock was not acquired. This means a 0 is returned
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314 * if the lock has already been acquired by this thread!
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315 */
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316 int
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317 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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318 {
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319 int success ;
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320
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321 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
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322
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323 success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag ? INFINITE : 0)) == WAIT_OBJECT_0 ;
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324
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325 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));
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326
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327 return success;
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328 }
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329
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330 void
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331 PyThread_release_lock(PyThread_type_lock aLock)
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332 {
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333 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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334
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335 if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
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336 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n", PyThread_get_thread_ident(), aLock, GetLastError()));
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337 }
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338
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339 /* minimum/maximum thread stack sizes supported */
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340 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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341 #define THREAD_MAX_STACKSIZE 0x10000000 /* 256MB */
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342
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343 /* set the thread stack size.
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344 * Return 0 if size is valid, -1 otherwise.
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345 */
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346 static int
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347 _pythread_nt_set_stacksize(size_t size)
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348 {
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349 /* set to default */
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350 if (size == 0) {
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351 _pythread_stacksize = 0;
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352 return 0;
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353 }
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354
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355 /* valid range? */
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356 if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
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357 _pythread_stacksize = size;
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358 return 0;
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359 }
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360
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361 return -1;
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362 }
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363
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364 #define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)