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annotate Python/thread_nt.h @ 45151:643c1397f954 legacy-trunk

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#1750076: Debugger did not step on every iteration of a while statement. The mapping between bytecode offsets and source lines (lnotab) did not contain an entry for the beginning of the loop. Now it does, and the lnotab can be a bit larger: in particular, several statements on the same line generate several entries. However, this does not bother the settrace function, which will trigger only one 'line' event. The lnotab seems to be exactly the same as with python2.4.
author Amaury Forgeot d'Arc <amauryfa@gmail.com>
date Mon, 04 Feb 2008 21:45:05 +0000
parents 1c1705bf36b8
children e38335d4df91 fdcca8793eb9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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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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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b86392f55b59 bug [ 1234979 ] Lock.acquire treats only 1 as True
Georg Brandl <georg@python.org>
parents: 29755
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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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ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 13138
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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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19430cdff2bd clean up function declarations to conform to PEP-7 style.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38578
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277 void
19430cdff2bd clean up function declarations to conform to PEP-7 style.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38578
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278 PyThread_release_lock(PyThread_type_lock aLock)
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279 {
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Fred Drake <fdrake@acm.org>
parents: 13138
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280 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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281
12584
cde4da18c4fa Fast NonRecursiveMutex support by Yakov Markovitch, markovitch@iso.ru,
Guido van Rossum <guido@python.org>
parents: 11673
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282 if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
41525
b68272449df4 Merge change 54909 from release25-maint: Fix several minor issues discovered using code analysis in VisualStudio 2005 Team Edition
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 38794
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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 }
38794
f7d23bca599f Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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285
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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286 /* minimum/maximum thread stack sizes supported */
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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287 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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288 #define THREAD_MAX_STACKSIZE 0x10000000 /* 256MB */
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289
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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290 /* set the thread stack size.
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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291 * Return 0 if size is valid, -1 otherwise.
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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292 */
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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293 static int
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294 _pythread_nt_set_stacksize(size_t size)
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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295 {
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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296 /* set to default */
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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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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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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301
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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302 /* valid range? */
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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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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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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305 return 0;
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306 }
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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307
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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308 return -1;
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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309 }
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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310
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 38716
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311 #define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)