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annotate Python/thread_pth.h @ 29643:fa97293533a9 legacy-trunk

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Add PyThreadState_SetAsyncExc(long, PyObject *). A new API (only accessible from C) to interrupt a thread by sending it an exception. This is not always effective, but might help some people. Requested by Just van Rossum and Alex Martelli. It is intentional that you have to write your own C extension to call it from Python. Docs will have to wait.
author Guido van Rossum <guido@python.org>
date Sat, 28 Jun 2003 21:53:52 +0000
parents 8b116a8449bd
children 1a817694ecbd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* GNU pth threads interface
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3 http://www.gnu.org/software/pth
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4 2000-05-03 Andy Dustman <andy@dustman.net>
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5
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6 Adapted from Posix threads interface
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7 12 May 1997 -- david arnold <davida@pobox.com>
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8 */
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9
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <pth.h>
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13
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14 /* A pth mutex isn't sufficient to model the Python lock type
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15 * because pth mutexes can be acquired multiple times by the
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16 * same thread.
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17 *
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18 * The pth_lock struct implements a Python lock as a "locked?" bit
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19 * and a <condition, mutex> pair. In general, if the bit can be acquired
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20 * instantly, it is, else the pair is used to block the thread until the
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21 * bit is cleared.
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22 */
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23
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24 typedef struct {
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25 char locked; /* 0=unlocked, 1=locked */
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26 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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27 pth_cond_t lock_released;
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28 pth_mutex_t mut;
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29 } pth_lock;
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30
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31 #define CHECK_STATUS(name) if (status == -1) { printf("%d ", status); perror(name); error = 1; }
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32
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33 /*
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34 * Initialization.
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35 */
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36
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37 static void PyThread__init_thread(void)
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38 {
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39 pth_init();
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40 }
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41
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42 /*
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43 * Thread support.
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44 */
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45
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46
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47 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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48 {
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49 pth_t th;
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50 dprintf(("PyThread_start_new_thread called\n"));
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51 if (!initialized)
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52 PyThread_init_thread();
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53
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54 th = pth_spawn(PTH_ATTR_DEFAULT,
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55 (void* (*)(void *))func,
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56 (void *)arg
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57 );
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58
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59 return th;
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60 }
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61
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62 long PyThread_get_thread_ident(void)
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63 {
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64 volatile pth_t threadid;
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65 if (!initialized)
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66 PyThread_init_thread();
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67 /* Jump through some hoops for Alpha OSF/1 */
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68 threadid = pth_self();
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69 return (long) *(long *) &threadid;
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70 }
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71
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72 static void do_PyThread_exit_thread(int no_cleanup)
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73 {
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74 dprintf(("PyThread_exit_thread called\n"));
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75 if (!initialized) {
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76 if (no_cleanup)
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77 _exit(0);
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78 else
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79 exit(0);
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80 }
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81 }
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82
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83 void PyThread_exit_thread(void)
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84 {
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85 do_PyThread_exit_thread(0);
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86 }
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87
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88 void PyThread__exit_thread(void)
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89 {
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90 do_PyThread_exit_thread(1);
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91 }
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92
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93 #ifndef NO_EXIT_PROG
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94 static void do_PyThread_exit_prog(int status, int no_cleanup)
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95 {
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96 dprintf(("PyThread_exit_prog(%d) called\n", status));
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97 if (!initialized)
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98 if (no_cleanup)
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99 _exit(status);
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100 else
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101 exit(status);
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102 }
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103
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104 void PyThread_exit_prog(int status)
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105 {
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106 do_PyThread_exit_prog(status, 0);
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107 }
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108
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109 void PyThread__exit_prog(int status)
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110 {
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111 do_PyThread_exit_prog(status, 1);
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112 }
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113 #endif /* NO_EXIT_PROG */
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114
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115 /*
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116 * Lock support.
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117 */
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118 PyThread_type_lock PyThread_allocate_lock(void)
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119 {
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120 pth_lock *lock;
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121 int status, error = 0;
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122
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123 dprintf(("PyThread_allocate_lock called\n"));
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124 if (!initialized)
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125 PyThread_init_thread();
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126
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127 lock = (pth_lock *) malloc(sizeof(pth_lock));
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128 memset((void *)lock, '\0', sizeof(pth_lock));
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129 if (lock) {
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130 lock->locked = 0;
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131 status = pth_mutex_init(&lock->mut);
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132 CHECK_STATUS("pth_mutex_init");
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133 status = pth_cond_init(&lock->lock_released);
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134 CHECK_STATUS("pth_cond_init");
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135 if (error) {
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136 free((void *)lock);
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137 lock = NULL;
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138 }
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139 }
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140 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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141 return (PyThread_type_lock) lock;
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142 }
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143
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144 void PyThread_free_lock(PyThread_type_lock lock)
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145 {
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146 pth_lock *thelock = (pth_lock *)lock;
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147
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148 dprintf(("PyThread_free_lock(%p) called\n", lock));
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149
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150 free((void *)thelock);
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151 }
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152
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153 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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154 {
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155 int success;
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156 pth_lock *thelock = (pth_lock *)lock;
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157 int status, error = 0;
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158
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159 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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160
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161 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
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162 CHECK_STATUS("pth_mutex_acquire[1]");
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163 success = thelock->locked == 0;
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164 if (success) thelock->locked = 1;
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165 status = pth_mutex_release( &thelock->mut );
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166 CHECK_STATUS("pth_mutex_release[1]");
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167
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168 if ( !success && waitflag ) {
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169 /* continue trying until we get the lock */
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170
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171 /* mut must be locked by me -- part of the condition
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172 * protocol */
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173 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
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174 CHECK_STATUS("pth_mutex_acquire[2]");
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175 while ( thelock->locked ) {
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176 status = pth_cond_await(&thelock->lock_released,
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177 &thelock->mut, NULL);
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178 CHECK_STATUS("pth_cond_await");
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179 }
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180 thelock->locked = 1;
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181 status = pth_mutex_release( &thelock->mut );
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182 CHECK_STATUS("pth_mutex_release[2]");
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183 success = 1;
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184 }
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185 if (error) success = 0;
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186 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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187 return success;
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188 }
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189
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190 void PyThread_release_lock(PyThread_type_lock lock)
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191 {
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192 pth_lock *thelock = (pth_lock *)lock;
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193 int status, error = 0;
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194
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195 dprintf(("PyThread_release_lock(%p) called\n", lock));
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196
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197 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
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198 CHECK_STATUS("pth_mutex_acquire[3]");
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199
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200 thelock->locked = 0;
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201
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202 status = pth_mutex_release( &thelock->mut );
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203 CHECK_STATUS("pth_mutex_release[3]");
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204
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205 /* wake up someone (anyone, if any) waiting on the lock */
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206 status = pth_cond_notify( &thelock->lock_released, 0 );
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207 CHECK_STATUS("pth_cond_notify");
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208 }