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SF bug 1061968: threads: segfault or Py_FatalError at exit PyGILState_Ensure(): The fix in 2.4a3 for bug 1010677 reintroduced thread shutdown race bug 225673. Repaired by (once again) ensuring the GIL is held whenever deleting a thread state. Alas, there's no useful test case for this shy bug. Four years ago, only Guido could provoke it, on his box, and today only Armin can provoke it on his box. I've never been able to provoke it (but not for lack of trying!). This is a critical fix for 2.3.5 too, since the fix for 1010677 got backported there already and so also reintroduced 225673. I don't intend to backport this fix. For whoever (if anyone) does, there are other thread fixes in 2.4 that need backporting too, and I bet they need to happen first for this patch to apply cleanly.
author Tim Peters <tim.peters@gmail.com>
date Mon, 08 Nov 2004 04:30:21 +0000
parents ebfd87e87884
children 58d5a6c7b629
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1
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2 /* This code implemented by Mark Hammond (MHammond@skippinet.com.au) */
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3
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4 #include <windows.h>
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5 #include <limits.h>
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6 #include <pydebug.h>
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7
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8 long PyThread_get_thread_ident(void);
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9
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10 /*
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11 * Change all headers to pure ANSI as no one will use K&R style on an
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12 * NT
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13 */
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14
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15 /*
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16 * Initialization of the C package, should not be needed.
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17 */
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18 static void PyThread__init_thread(void)
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19 {
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20 }
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21
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22 /*
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23 * Thread support.
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24 */
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25 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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26 {
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27 long rv;
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28 int success = -1;
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30 dprintf(("%ld: PyThread_start_new_thread called\n", PyThread_get_thread_ident()));
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31 if (!initialized)
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32 PyThread_init_thread();
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33
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34 rv = _beginthread(func, 0, arg); /* use default stack size */
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35
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36 if (rv != -1) {
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37 success = 0;
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38 dprintf(("%ld: PyThread_start_new_thread succeeded:\n", PyThread_get_thread_ident()));
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39 }
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40
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41 return success;
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42 }
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43
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44 /*
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45 * Return the thread Id instead of an handle. The Id is said to uniquely identify the
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46 * thread in the system
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47 */
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48 long PyThread_get_thread_ident(void)
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49 {
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50 if (!initialized)
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51 PyThread_init_thread();
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52
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53 return GetCurrentThreadId();
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54 }
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55
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56 static void do_PyThread_exit_thread(int no_cleanup)
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57 {
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58 dprintf(("%ld: do_PyThread_exit_thread called\n", PyThread_get_thread_ident()));
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59 if (!initialized)
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60 if (no_cleanup)
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61 exit(0); /* XXX - was _exit()!! */
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62 else
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63 exit(0);
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64 _endthread();
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65 }
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66
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67 void PyThread_exit_thread(void)
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68 {
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69 do_PyThread_exit_thread(0);
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70 }
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71
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72 void PyThread__exit_thread(void)
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73 {
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74 do_PyThread_exit_thread(1);
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75 }
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76
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77 #ifndef NO_EXIT_PROG
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78 static void do_PyThread_exit_prog(int status, int no_cleanup)
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79 {
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80 dprintf(("PyThread_exit_prog(%d) called\n", status));
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81 if (!initialized)
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82 if (no_cleanup)
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83 _exit(status);
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84 else
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85 exit(status);
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86 }
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87
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88 void PyThread_exit_prog(int status)
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89 {
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90 do_PyThread_exit_prog(status, 0);
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91 }
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92
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f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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93 void PyThread__exit_prog(int status)
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94 {
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95 do_PyThread_exit_prog(status, 1);
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96 }
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97 #endif /* NO_EXIT_PROG */
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98
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99 /*
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100 * Lock support. It has to be implemented using Mutexes, as
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101 * CE doesnt support semaphores. Therefore we use some hacks to
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102 * simulate the non reentrant requirements of Python locks
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103 */
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104 PyThread_type_lock PyThread_allocate_lock(void)
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105 {
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106 HANDLE aLock;
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107
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108 dprintf(("PyThread_allocate_lock called\n"));
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109 if (!initialized)
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110 PyThread_init_thread();
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111
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112 aLock = CreateEvent(NULL, /* Security attributes */
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113 0, /* Manual-Reset */
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114 1, /* Is initially signalled */
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115 NULL); /* Name of event */
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116
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117 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
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118
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119 return (PyThread_type_lock) aLock;
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120 }
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121
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122 void PyThread_free_lock(PyThread_type_lock aLock)
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123 {
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124 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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125
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126 CloseHandle(aLock);
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127 }
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128
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129 /*
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130 * Return 1 on success if the lock was acquired
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131 *
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132 * and 0 if the lock was not acquired. This means a 0 is returned
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133 * if the lock has already been acquired by this thread!
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134 */
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135 int PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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136 {
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137 int success = 1;
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138 DWORD waitResult;
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139
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140 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
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141
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142 #ifndef DEBUG
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143 waitResult = WaitForSingleObject(aLock, (waitflag == 1 ? INFINITE : 0));
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144 #else
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145 /* To aid in debugging, we regularly wake up. This allows us to
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146 break into the debugger */
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147 while (TRUE) {
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148 waitResult = WaitForSingleObject(aLock, waitflag ? 3000 : 0);
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149 if (waitflag==0 || (waitflag==1 && waitResult == WAIT_OBJECT_0))
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150 break;
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151 }
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152 #endif
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153
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154 if (waitResult != WAIT_OBJECT_0) {
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155 success = 0; /* We failed */
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156 }
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157
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
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158 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));
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159
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160 return success;
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161 }
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162
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163 void PyThread_release_lock(PyThread_type_lock aLock)
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164 {
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
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165 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
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166
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167 if (!SetEvent(aLock))
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
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168 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n", PyThread_get_thread_ident(), aLock, GetLastError()));
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169 }
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170
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171