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annotate Python/thread_nt.h @ 58664:993f703a61ba

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Merged revisions 77484,77487,77561,77570,77593,77603,77608,77667,77702-77703,77739,77858,77887,77889 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77484 | skip.montanaro | 2010-01-13 19:12:34 -0600 (Wed, 13 Jan 2010) | 4 lines Update PyEval_EvalFrame to PyEval_EvalFrameEx. This looks to have been done partially before. Also add a comment describing how this might have to work with different versions of the interpreter. ........ r77487 | ezio.melotti | 2010-01-14 05:34:10 -0600 (Thu, 14 Jan 2010) | 1 line Fixed typo ........ r77561 | georg.brandl | 2010-01-17 02:42:30 -0600 (Sun, 17 Jan 2010) | 1 line #7699: improve datetime docs: straightforward linking to strftime/strptime section, mark classmethods as such. ........ r77570 | georg.brandl | 2010-01-17 06:14:42 -0600 (Sun, 17 Jan 2010) | 1 line Add note about usage of STRINGLIB_EMPTY. ........ r77593 | georg.brandl | 2010-01-17 17:33:53 -0600 (Sun, 17 Jan 2010) | 1 line Fix internal reference. ........ r77603 | benjamin.peterson | 2010-01-18 17:07:56 -0600 (Mon, 18 Jan 2010) | 8 lines data descriptors do not override the class dictionary if __get__ is not defined Adjust documentation and add a test to verify this behavior. See http://mail.python.org/pipermail/python-dev/2010-January/095637.html for discussion. ........ r77608 | gregory.p.smith | 2010-01-19 02:19:03 -0600 (Tue, 19 Jan 2010) | 6 lines Do not compile stubs for the sha2 series hashes in the openssl hashlib module when the openssl version is too old to support them. That leads both compiled code bloat and to unittests attempting to test implementations that don't exist for comparison purposes on such platforms. ........ r77667 | mark.dickinson | 2010-01-21 12:32:27 -0600 (Thu, 21 Jan 2010) | 1 line Add two more test_strtod test values. ........ r77702 | georg.brandl | 2010-01-23 02:43:31 -0600 (Sat, 23 Jan 2010) | 1 line #7762: fix refcount annotation of PyUnicode_Tailmatch(). ........ r77703 | georg.brandl | 2010-01-23 02:47:54 -0600 (Sat, 23 Jan 2010) | 1 line #7725: fix referencing issue. ........ r77739 | benjamin.peterson | 2010-01-24 21:52:52 -0600 (Sun, 24 Jan 2010) | 1 line mention from_float() in error message ........ r77858 | georg.brandl | 2010-01-30 11:57:48 -0600 (Sat, 30 Jan 2010) | 1 line #7802: fix invalid example (heh). ........ r77887 | georg.brandl | 2010-01-31 12:51:49 -0600 (Sun, 31 Jan 2010) | 5 lines Fix-up ftplib documentation: move exception descriptions to toplevel, not inside a class remove attribution in "versionadded" spell and grammar check docstring of FTP_TLS ........ r77889 | michael.foord | 2010-01-31 13:59:26 -0600 (Sun, 31 Jan 2010) | 1 line Minor modification to unittest documentation. ........
author Benjamin Peterson <benjamin@python.org>
date Wed, 03 Feb 2010 02:35:45 +0000
parents 2b2707ff8bb7
children f197407bdba2 798e0d0c7246
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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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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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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 } callobj;
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108
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109 /* thunker to call adapt between the function type used by the system's
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110 thread start function and the internally used one. */
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111 #if defined(MS_WINCE)
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112 static DWORD WINAPI
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113 #else
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114 static unsigned __stdcall
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115 #endif
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116 bootstrap(void *call)
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117 {
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118 callobj *obj = (callobj*)call;
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119 void (*func)(void*) = obj->func;
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120 void *arg = obj->arg;
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121 HeapFree(GetProcessHeap(), 0, obj);
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122 func(arg);
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123 return 0;
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124 }
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125
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126 long
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127 PyThread_start_new_thread(void (*func)(void *), void *arg)
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128 {
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129 HANDLE hThread;
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130 unsigned threadID;
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131 callobj *obj;
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132
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133 dprintf(("%ld: PyThread_start_new_thread called\n",
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134 PyThread_get_thread_ident()));
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135 if (!initialized)
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136 PyThread_init_thread();
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137
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138 obj = (callobj*)HeapAlloc(GetProcessHeap(), 0, sizeof(*obj));
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139 if (!obj)
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140 return -1;
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141 obj->func = func;
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142 obj->arg = arg;
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143 #if defined(MS_WINCE)
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144 hThread = CreateThread(NULL,
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145 Py_SAFE_DOWNCAST(_pythread_stacksize, Py_ssize_t, SIZE_T),
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146 bootstrap, obj, 0, &threadID);
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147 #else
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148 hThread = (HANDLE)_beginthreadex(0,
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149 Py_SAFE_DOWNCAST(_pythread_stacksize,
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150 Py_ssize_t, unsigned int),
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151 bootstrap, obj,
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152 0, &threadID);
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153 #endif
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154 if (hThread == 0) {
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155 #if defined(MS_WINCE)
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156 /* Save error in variable, to prevent PyThread_get_thread_ident
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157 from clobbering it. */
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158 unsigned e = GetLastError();
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159 dprintf(("%ld: PyThread_start_new_thread failed, win32 error code %u\n",
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160 PyThread_get_thread_ident(), e));
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161 #else
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162 /* I've seen errno == EAGAIN here, which means "there are
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163 * too many threads".
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164 */
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165 int e = errno;
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166 dprintf(("%ld: PyThread_start_new_thread failed, errno %d\n",
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167 PyThread_get_thread_ident(), e));
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168 #endif
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169 threadID = (unsigned)-1;
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170 HeapFree(GetProcessHeap(), 0, obj);
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171 }
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172 else {
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173 dprintf(("%ld: PyThread_start_new_thread succeeded: %p\n",
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174 PyThread_get_thread_ident(), (void*)hThread));
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175 CloseHandle(hThread);
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176 }
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177 return (long) threadID;
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178 }
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179
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180 /*
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181 * Return the thread Id instead of an handle. The Id is said to uniquely identify the
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182 * thread in the system
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183 */
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184 long
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185 PyThread_get_thread_ident(void)
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186 {
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187 if (!initialized)
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188 PyThread_init_thread();
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189
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190 return GetCurrentThreadId();
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191 }
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192
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193 void
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194 PyThread_exit_thread(void)
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195 {
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196 dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
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197 if (!initialized)
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198 exit(0);
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199 #if defined(MS_WINCE)
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200 ExitThread(0);
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201 #else
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202 _endthreadex(0);
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203 #endif
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204 }
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205
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206 #ifndef NO_EXIT_PROG
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207 void
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208 PyThread_exit_prog(int status)
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209 {
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210 dprintf(("PyThread_exit_prog(%d) called\n", status));
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211 if (!initialized)
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212 exit(status);
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213 }
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214 #endif /* NO_EXIT_PROG */
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215
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216 /*
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217 * Lock support. It has too be implemented as semaphores.
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218 * I [Dag] tried to implement it with mutex but I could find a way to
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219 * tell whether a thread already own the lock or not.
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220 */
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221 PyThread_type_lock
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222 PyThread_allocate_lock(void)
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223 {
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224 PNRMUTEX aLock;
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225
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226 dprintf(("PyThread_allocate_lock called\n"));
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227 if (!initialized)
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228 PyThread_init_thread();
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229
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230 aLock = AllocNonRecursiveMutex() ;
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231
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232 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
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233
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234 return (PyThread_type_lock) aLock;
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235 }
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236
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237 void
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238 PyThread_free_lock(PyThread_type_lock aLock)
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239 {
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240 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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241
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242 FreeNonRecursiveMutex(aLock) ;
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243 }
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244
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245 /*
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246 * Return 1 on success if the lock was acquired
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247 *
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248 * and 0 if the lock was not acquired. This means a 0 is returned
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249 * if the lock has already been acquired by this thread!
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250 */
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251 int
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252 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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253 {
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254 int success ;
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255
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256 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
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257
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258 success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag ? INFINITE : 0)) == WAIT_OBJECT_0 ;
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259
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260 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));
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261
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262 return success;
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263 }
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264
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265 void
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266 PyThread_release_lock(PyThread_type_lock aLock)
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267 {
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268 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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269
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270 if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
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271 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %ld\n", PyThread_get_thread_ident(), aLock, GetLastError()));
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272 }
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273
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274 /* minimum/maximum thread stack sizes supported */
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275 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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276 #define THREAD_MAX_STACKSIZE 0x10000000 /* 256MB */
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277
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278 /* set the thread stack size.
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279 * Return 0 if size is valid, -1 otherwise.
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280 */
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281 static int
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282 _pythread_nt_set_stacksize(size_t size)
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283 {
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284 /* set to default */
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285 if (size == 0) {
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286 _pythread_stacksize = 0;
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287 return 0;
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288 }
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289
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290 /* valid range? */
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291 if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
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292 _pythread_stacksize = size;
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293 return 0;
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294 }
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295
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296 return -1;
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297 }
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298
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299 #define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)
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300
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301
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302 /* use native Windows TLS functions */
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303 #define Py_HAVE_NATIVE_TLS
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304
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305 #ifdef Py_HAVE_NATIVE_TLS
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306 int
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307 PyThread_create_key(void)
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308 {
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309 return (int) TlsAlloc();
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310 }
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311
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312 void
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313 PyThread_delete_key(int key)
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314 {
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315 TlsFree(key);
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316 }
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317
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318 /* We must be careful to emulate the strange semantics implemented in thread.c,
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319 * where the value is only set if it hasn't been set before.
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320 */
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321 int
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322 PyThread_set_key_value(int key, void *value)
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323 {
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324 BOOL ok;
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325 void *oldvalue;
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326
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327 assert(value != NULL);
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328 oldvalue = TlsGetValue(key);
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329 if (oldvalue != NULL)
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330 /* ignore value if already set */
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331 return 0;
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332 ok = TlsSetValue(key, value);
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333 if (!ok)
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334 return -1;
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335 return 0;
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336 }
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337
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338 void *
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339 PyThread_get_key_value(int key)
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340 {
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341 /* because TLS is used in the Py_END_ALLOW_THREAD macro,
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342 * it is necessary to preserve the windows error state, because
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343 * it is assumed to be preserved across the call to the macro.
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344 * Ideally, the macro should be fixed, but it is simpler to
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345 * do it here.
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346 */
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347 DWORD error = GetLastError();
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348 void *result = TlsGetValue(key);
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349 SetLastError(error);
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350 return result;
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351 }
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352
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353 void
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354 PyThread_delete_key_value(int key)
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355 {
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356 /* NULL is used as "key missing", and it is also the default
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357 * given by TlsGetValue() if nothing has been set yet.
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358 */
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359 TlsSetValue(key, NULL);
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360 }
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361
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362 /* reinitialization of TLS is not necessary after fork when using
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363 * the native TLS functions. And forking isn't supported on Windows either.
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364 */
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365 void
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366 PyThread_ReInitTLS(void)
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367 {}
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368
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369 #endif