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annotate Python/thread_nt.h @ 46606:af0ef04401bb

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Fix nits in builtin next().
author Georg Brandl <georg@python.org>
date Wed, 30 Apr 2008 19:47:01 +0000
parents 00c02c4488ce
children 2b2707ff8bb7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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
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19 BOOL
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20 InitializeNonRecursiveMutex(PNRMUTEX mutex)
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21 {
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22 mutex->owned = -1 ; /* No threads have entered NonRecursiveMutex */
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23 mutex->thread_id = 0 ;
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24 mutex->hevent = CreateEvent(NULL, FALSE, FALSE, NULL) ;
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25 return mutex->hevent != NULL ; /* TRUE if the mutex is created */
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26 }
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27
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28 VOID
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29 DeleteNonRecursiveMutex(PNRMUTEX mutex)
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30 {
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31 /* No in-use check */
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32 CloseHandle(mutex->hevent) ;
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33 mutex->hevent = NULL ; /* Just in case */
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34 }
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35
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36 DWORD
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37 EnterNonRecursiveMutex(PNRMUTEX mutex, BOOL wait)
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38 {
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39 /* Assume that the thread waits successfully */
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40 DWORD ret ;
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41
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42 /* InterlockedIncrement(&mutex->owned) == 0 means that no thread currently owns the mutex */
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43 if (!wait)
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44 {
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45 if (InterlockedCompareExchange(&mutex->owned, 0, -1) != -1)
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46 return WAIT_TIMEOUT ;
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47 ret = WAIT_OBJECT_0 ;
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48 }
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49 else
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50 ret = InterlockedIncrement(&mutex->owned) ?
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51 /* Some thread owns the mutex, let's wait... */
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52 WaitForSingleObject(mutex->hevent, INFINITE) : WAIT_OBJECT_0 ;
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53
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54 mutex->thread_id = GetCurrentThreadId() ; /* We own it */
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55 return ret ;
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56 }
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57
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58 BOOL
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59 LeaveNonRecursiveMutex(PNRMUTEX mutex)
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60 {
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61 /* We don't own the mutex */
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62 mutex->thread_id = 0 ;
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63 return
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64 InterlockedDecrement(&mutex->owned) < 0 ||
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65 SetEvent(mutex->hevent) ; /* Other threads are waiting, wake one on them up */
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66 }
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67
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68 PNRMUTEX
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69 AllocNonRecursiveMutex(void)
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70 {
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71 PNRMUTEX mutex = (PNRMUTEX)malloc(sizeof(NRMUTEX)) ;
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72 if (mutex && !InitializeNonRecursiveMutex(mutex))
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73 {
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74 free(mutex) ;
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75 mutex = NULL ;
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76 }
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77 return mutex ;
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78 }
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79
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80 void
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81 FreeNonRecursiveMutex(PNRMUTEX mutex)
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82 {
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83 if (mutex)
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84 {
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85 DeleteNonRecursiveMutex(mutex) ;
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86 free(mutex) ;
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87 }
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88 }
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89
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90 long PyThread_get_thread_ident(void);
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91
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92 /*
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93 * Initialization of the C package, should not be needed.
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94 */
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95 static void
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96 PyThread__init_thread(void)
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97 {
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98 }
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99
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100 /*
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101 * Thread support.
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102 */
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103
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104 typedef struct {
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105 void (*func)(void*);
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106 void *arg;
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107 long id;
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108 HANDLE done;
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109 } callobj;
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110
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111 static int
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112 bootstrap(void *call)
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113 {
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114 callobj *obj = (callobj*)call;
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115 /* copy callobj since other thread might free it before we're done */
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116 void (*func)(void*) = obj->func;
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117 void *arg = obj->arg;
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118
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119 obj->id = PyThread_get_thread_ident();
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120 ReleaseSemaphore(obj->done, 1, NULL);
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121 func(arg);
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122 return 0;
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123 }
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124
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125 long
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126 PyThread_start_new_thread(void (*func)(void *), void *arg)
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127 {
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128 Py_uintptr_t rv;
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129 callobj obj;
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130
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131 dprintf(("%ld: PyThread_start_new_thread called\n",
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132 PyThread_get_thread_ident()));
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133 if (!initialized)
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134 PyThread_init_thread();
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135
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136 obj.id = -1; /* guilty until proved innocent */
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137 obj.func = func;
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138 obj.arg = arg;
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139 obj.done = CreateSemaphore(NULL, 0, 1, NULL);
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140 if (obj.done == NULL)
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141 return -1;
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142
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143 rv = _beginthread(bootstrap,
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144 Py_SAFE_DOWNCAST(_pythread_stacksize,
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145 Py_ssize_t, int),
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146 &obj);
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147 if (rv == (Py_uintptr_t)-1) {
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148 /* I've seen errno == EAGAIN here, which means "there are
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149 * too many threads".
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150 */
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151 dprintf(("%ld: PyThread_start_new_thread failed: %p errno %d\n",
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152 PyThread_get_thread_ident(), (void*)rv, errno));
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153 obj.id = -1;
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154 }
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155 else {
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156 dprintf(("%ld: PyThread_start_new_thread succeeded: %p\n",
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157 PyThread_get_thread_ident(), (void*)rv));
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158 /* wait for thread to initialize, so we can get its id */
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159 WaitForSingleObject(obj.done, INFINITE);
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160 assert(obj.id != -1);
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161 }
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162 CloseHandle((HANDLE)obj.done);
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163 return obj.id;
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164 }
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165
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166 /*
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167 * Return the thread Id instead of an handle. The Id is said to uniquely identify the
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168 * thread in the system
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169 */
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170 long
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171 PyThread_get_thread_ident(void)
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172 {
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173 if (!initialized)
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174 PyThread_init_thread();
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175
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176 return GetCurrentThreadId();
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177 }
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178
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179 static void
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180 do_PyThread_exit_thread(int no_cleanup)
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181 {
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182 dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
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183 if (!initialized)
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184 if (no_cleanup)
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185 _exit(0);
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186 else
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187 exit(0);
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188 _endthread();
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189 }
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190
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191 void
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192 PyThread_exit_thread(void)
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193 {
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194 do_PyThread_exit_thread(0);
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195 }
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196
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197 void
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198 PyThread__exit_thread(void)
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199 {
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200 do_PyThread_exit_thread(1);
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201 }
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202
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203 #ifndef NO_EXIT_PROG
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204 static void
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205 do_PyThread_exit_prog(int status, int no_cleanup)
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206 {
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207 dprintf(("PyThread_exit_prog(%d) called\n", status));
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208 if (!initialized)
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209 if (no_cleanup)
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210 _exit(status);
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211 else
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212 exit(status);
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213 }
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214
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215 void
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216 PyThread_exit_prog(int status)
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217 {
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218 do_PyThread_exit_prog(status, 0);
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219 }
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220
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221 void
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222 PyThread__exit_prog(int status)
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223 {
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224 do_PyThread_exit_prog(status, 1);
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225 }
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226 #endif /* NO_EXIT_PROG */
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227
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228 /*
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229 * Lock support. It has too be implemented as semaphores.
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230 * I [Dag] tried to implement it with mutex but I could find a way to
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231 * tell whether a thread already own the lock or not.
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232 */
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233 PyThread_type_lock
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234 PyThread_allocate_lock(void)
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235 {
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236 PNRMUTEX aLock;
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237
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238 dprintf(("PyThread_allocate_lock called\n"));
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239 if (!initialized)
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240 PyThread_init_thread();
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241
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242 aLock = AllocNonRecursiveMutex() ;
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243
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244 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
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245
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246 return (PyThread_type_lock) aLock;
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247 }
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248
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249 void
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250 PyThread_free_lock(PyThread_type_lock aLock)
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251 {
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252 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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253
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254 FreeNonRecursiveMutex(aLock) ;
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255 }
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256
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257 /*
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258 * Return 1 on success if the lock was acquired
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259 *
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260 * and 0 if the lock was not acquired. This means a 0 is returned
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261 * if the lock has already been acquired by this thread!
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262 */
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263 int
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264 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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265 {
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266 int success ;
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267
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268 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
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269
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270 success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag ? INFINITE : 0)) == WAIT_OBJECT_0 ;
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271
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272 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));
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273
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274 return success;
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275 }
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276
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277 void
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278 PyThread_release_lock(PyThread_type_lock aLock)
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279 {
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280 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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281
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282 if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
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283 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %ld\n", PyThread_get_thread_ident(), aLock, GetLastError()));
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284 }
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285
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286 /* minimum/maximum thread stack sizes supported */
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287 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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288 #define THREAD_MAX_STACKSIZE 0x10000000 /* 256MB */
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289
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290 /* set the thread stack size.
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291 * Return 0 if size is valid, -1 otherwise.
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292 */
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293 static int
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294 _pythread_nt_set_stacksize(size_t size)
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295 {
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296 /* set to default */
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297 if (size == 0) {
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298 _pythread_stacksize = 0;
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299 return 0;
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300 }
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301
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302 /* valid range? */
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303 if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
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304 _pythread_stacksize = size;
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305 return 0;
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306 }
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307
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308 return -1;
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309 }
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310
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311 #define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)