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annotate Python/thread_pth.h @ 24042:63fbbed10714 legacy-trunk

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Simplify HTTPSConnection constructor. See discussion in SF bug 458463.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Fri, 28 Jun 2002 23:38:14 +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 }