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annotate Python/thread_os2.h @ 33940:dfd07b7be407 legacy-trunk

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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 8e1567dbcba8
children e1a7eb832cb5
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1 /* This code implemented by cvale@netcom.com */
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2
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3 #define INCL_DOSPROCESS
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4 #define INCL_DOSSEMAPHORES
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5 #include "os2.h"
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6 #include "limits.h"
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7
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8 #include "process.h"
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9
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10 #if defined(PYCC_GCC)
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11 #include <sys/builtin.h>
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12 #include <sys/fmutex.h>
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13 #else
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14 long PyThread_get_thread_ident(void);
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15 #endif
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16
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17 /*
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18 * Initialization of the C package, should not be needed.
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19 */
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20 static void
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21 PyThread__init_thread(void)
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22 {
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23 }
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24
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25 /*
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26 * Thread support.
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27 */
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28 long
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29 PyThread_start_new_thread(void (*func)(void *), void *arg)
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30 {
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31 int aThread;
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32 int success = 0;
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33
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34 aThread = _beginthread(func,NULL,65536,arg);
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35
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36 if (aThread == -1) {
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37 success = -1;
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38 fprintf(stderr, "aThread failed == %d", aThread);
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39 dprintf(("_beginthread failed. return %ld\n", errno));
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40 }
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41
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42 return success;
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43 }
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44
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45 long
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46 PyThread_get_thread_ident(void)
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47 {
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48 #if !defined(PYCC_GCC)
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49 PPIB pib;
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50 PTIB tib;
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51 #endif
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52
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53 if (!initialized)
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54 PyThread_init_thread();
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55
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56 #if defined(PYCC_GCC)
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57 return _gettid();
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58 #else
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59 DosGetInfoBlocks(&tib, &pib);
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60 return tib->tib_ptib2->tib2_ultid;
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61 #endif
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62 }
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63
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64 static void
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65 do_PyThread_exit_thread(int no_cleanup)
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66 {
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67 dprintf(("%ld: PyThread_exit_thread called\n",
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68 PyThread_get_thread_ident()));
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69 if (!initialized)
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70 if (no_cleanup)
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71 _exit(0);
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72 else
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73 exit(0);
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74 _endthread();
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75 }
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76
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77 void
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78 PyThread_exit_thread(void)
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79 {
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80 do_PyThread_exit_thread(0);
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81 }
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82
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83 void
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84 PyThread__exit_thread(void)
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85 {
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86 do_PyThread_exit_thread(1);
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87 }
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88
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89 #ifndef NO_EXIT_PROG
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90 static void
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91 do_PyThread_exit_prog(int status, int no_cleanup)
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92 {
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93 dprintf(("PyThread_exit_prog(%d) called\n", status));
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94 if (!initialized)
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95 if (no_cleanup)
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96 _exit(status);
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97 else
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98 exit(status);
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99 }
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100
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101 void
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102 PyThread_exit_prog(int status)
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103 {
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104 do_PyThread_exit_prog(status, 0);
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105 }
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106
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107 void
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108 PyThread__exit_prog(int status)
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109 {
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110 do_PyThread_exit_prog(status, 1);
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111 }
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112 #endif /* NO_EXIT_PROG */
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113
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114 /*
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115 * Lock support. This is implemented with an event semaphore and critical
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116 * sections to make it behave more like a posix mutex than its OS/2
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117 * counterparts.
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118 */
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119
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120 typedef struct os2_lock_t {
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121 int is_set;
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122 HEV changed;
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123 } *type_os2_lock;
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124
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125 PyThread_type_lock
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126 PyThread_allocate_lock(void)
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127 {
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128 #if defined(PYCC_GCC)
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129 _fmutex *sem = malloc(sizeof(_fmutex));
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130 if (!initialized)
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131 PyThread_init_thread();
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132 dprintf(("%ld: PyThread_allocate_lock() -> %lx\n",
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133 PyThread_get_thread_ident(),
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134 (long)sem));
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135 if (_fmutex_create(sem, 0)) {
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136 free(sem);
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137 sem = NULL;
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138 }
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139 return (PyThread_type_lock)sem;
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140 #else
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141 APIRET rc;
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142 type_os2_lock lock = (type_os2_lock)malloc(sizeof(struct os2_lock_t));
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143
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144 dprintf(("PyThread_allocate_lock called\n"));
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145 if (!initialized)
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146 PyThread_init_thread();
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147
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148 lock->is_set = 0;
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149
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150 DosCreateEventSem(NULL, &lock->changed, 0, 0);
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151
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152 dprintf(("%ld: PyThread_allocate_lock() -> %p\n",
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153 PyThread_get_thread_ident(),
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154 lock->changed));
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155
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156 return (PyThread_type_lock)lock;
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157 #endif
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158 }
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159
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160 void
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161 PyThread_free_lock(PyThread_type_lock aLock)
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162 {
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163 #if !defined(PYCC_GCC)
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164 type_os2_lock lock = (type_os2_lock)aLock;
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165 #endif
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166
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167 dprintf(("%ld: PyThread_free_lock(%p) called\n",
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168 PyThread_get_thread_ident(),aLock));
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169
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170 #if defined(PYCC_GCC)
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171 if (aLock) {
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172 _fmutex_close((_fmutex *)aLock);
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173 free((_fmutex *)aLock);
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174 }
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175 #else
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176 DosCloseEventSem(lock->changed);
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177 free(aLock);
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178 #endif
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179 }
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180
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181 /*
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182 * Return 1 on success if the lock was acquired
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183 *
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184 * and 0 if the lock was not acquired.
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185 */
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186 int
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187 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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188 {
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189 #if !defined(PYCC_GCC)
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190 int done = 0;
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191 ULONG count;
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192 PID pid = 0;
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193 TID tid = 0;
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194 type_os2_lock lock = (type_os2_lock)aLock;
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195 #endif
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196
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197 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n",
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198 PyThread_get_thread_ident(),
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199 aLock,
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200 waitflag));
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201
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202 #if defined(PYCC_GCC)
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203 /* always successful if the lock doesn't exist */
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204 if (aLock &&
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205 _fmutex_request((_fmutex *)aLock, waitflag ? 0 : _FMR_NOWAIT))
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206 return 0;
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207 #else
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208 while (!done) {
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209 /* if the lock is currently set, we have to wait for
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210 * the state to change
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211 */
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212 if (lock->is_set) {
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213 if (!waitflag)
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214 return 0;
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215 DosWaitEventSem(lock->changed, SEM_INDEFINITE_WAIT);
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216 }
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217
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218 /* enter a critical section and try to get the semaphore. If
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219 * it is still locked, we will try again.
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220 */
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221 if (DosEnterCritSec())
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222 return 0;
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223
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224 if (!lock->is_set) {
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225 lock->is_set = 1;
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226 DosResetEventSem(lock->changed, &count);
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227 done = 1;
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228 }
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229
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230 DosExitCritSec();
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231 }
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232 #endif
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233
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234 return 1;
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235 }
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236
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237 void PyThread_release_lock(PyThread_type_lock aLock)
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238 {
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239 #if !defined(PYCC_GCC)
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240 type_os2_lock lock = (type_os2_lock)aLock;
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241 #endif
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242
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243 dprintf(("%ld: PyThread_release_lock(%p) called\n",
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244 PyThread_get_thread_ident(),
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245 aLock));
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246
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247 #if defined(PYCC_GCC)
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248 if (aLock)
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249 _fmutex_release((_fmutex *)aLock);
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250 #else
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251 if (!lock->is_set) {
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252 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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253 PyThread_get_thread_ident(),
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254 aLock,
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255 GetLastError()));
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256 return;
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257 }
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258
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259 if (DosEnterCritSec()) {
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260 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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diff changeset
261 PyThread_get_thread_ident(),
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262 aLock,
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263 GetLastError()));
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264 return;
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265 }
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266
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267 lock->is_set = 0;
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268 DosPostEventSem(lock->changed);
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269
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270 DosExitCritSec();
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271 #endif
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272 }