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annotate Python/thread_pth.h @ 76451:ea46ebba8a0f

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Issue #13959: Re-implement imp.source_from_cache() in Lib/imp.py.
author Brett Cannon <brett@python.org>
date Sat, 21 Apr 2012 18:52:52 -0400
parents 15b090c9442a
children
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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 pth_attr_t PyThread_attr;
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34
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35 /*
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36 * Initialization.
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37 */
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38
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39 static void PyThread__init_thread(void)
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40 {
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41 pth_init();
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42 PyThread_attr = pth_attr_new();
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43 pth_attr_set(PyThread_attr, PTH_ATTR_STACK_SIZE, 1<<18);
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44 pth_attr_set(PyThread_attr, PTH_ATTR_JOINABLE, FALSE);
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45 }
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46
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47 /*
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48 * Thread support.
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49 */
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51
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52 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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53 {
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54 pth_t th;
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55 dprintf(("PyThread_start_new_thread called\n"));
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56 if (!initialized)
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57 PyThread_init_thread();
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58
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59 th = pth_spawn(PyThread_attr,
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60 (void* (*)(void *))func,
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61 (void *)arg
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62 );
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63
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64 return th;
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65 }
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66
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67 long PyThread_get_thread_ident(void)
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68 {
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69 volatile pth_t threadid;
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70 if (!initialized)
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71 PyThread_init_thread();
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72 threadid = pth_self();
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73 return (long) threadid;
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74 }
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75
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76 void PyThread_exit_thread(void)
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77 {
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78 dprintf(("PyThread_exit_thread called\n"));
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79 if (!initialized) {
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80 exit(0);
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81 }
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82 }
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83
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84 /*
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85 * Lock support.
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86 */
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87 PyThread_type_lock PyThread_allocate_lock(void)
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88 {
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89 pth_lock *lock;
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90 int status, error = 0;
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91
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92 dprintf(("PyThread_allocate_lock called\n"));
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93 if (!initialized)
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94 PyThread_init_thread();
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95
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96 lock = (pth_lock *) malloc(sizeof(pth_lock));
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97 memset((void *)lock, '\0', sizeof(pth_lock));
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98 if (lock) {
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99 lock->locked = 0;
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100 status = pth_mutex_init(&lock->mut);
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101 CHECK_STATUS("pth_mutex_init");
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102 status = pth_cond_init(&lock->lock_released);
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103 CHECK_STATUS("pth_cond_init");
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104 if (error) {
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105 free((void *)lock);
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106 lock = NULL;
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107 }
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108 }
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109 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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110 return (PyThread_type_lock) lock;
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111 }
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112
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113 void PyThread_free_lock(PyThread_type_lock lock)
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114 {
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115 pth_lock *thelock = (pth_lock *)lock;
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116
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117 dprintf(("PyThread_free_lock(%p) called\n", lock));
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118
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119 free((void *)thelock);
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120 }
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121
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122 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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123 {
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124 int success;
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125 pth_lock *thelock = (pth_lock *)lock;
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126 int status, error = 0;
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127
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128 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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129
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130 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
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131 CHECK_STATUS("pth_mutex_acquire[1]");
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132 success = thelock->locked == 0;
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133 if (success) thelock->locked = 1;
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134 status = pth_mutex_release( &thelock->mut );
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135 CHECK_STATUS("pth_mutex_release[1]");
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136
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137 if ( !success && waitflag ) {
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138 /* continue trying until we get the lock */
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139
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140 /* mut must be locked by me -- part of the condition
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141 * protocol */
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142 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
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143 CHECK_STATUS("pth_mutex_acquire[2]");
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144 while ( thelock->locked ) {
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145 status = pth_cond_await(&thelock->lock_released,
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146 &thelock->mut, NULL);
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147 CHECK_STATUS("pth_cond_await");
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148 }
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149 thelock->locked = 1;
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150 status = pth_mutex_release( &thelock->mut );
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151 CHECK_STATUS("pth_mutex_release[2]");
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152 success = 1;
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153 }
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154 if (error) success = 0;
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155 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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156 return success;
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157 }
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158
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159 void PyThread_release_lock(PyThread_type_lock lock)
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160 {
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161 pth_lock *thelock = (pth_lock *)lock;
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162 int status, error = 0;
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163
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164 dprintf(("PyThread_release_lock(%p) called\n", lock));
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165
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166 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
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167 CHECK_STATUS("pth_mutex_acquire[3]");
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168
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169 thelock->locked = 0;
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170
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171 status = pth_mutex_release( &thelock->mut );
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172 CHECK_STATUS("pth_mutex_release[3]");
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173
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174 /* wake up someone (anyone, if any) waiting on the lock */
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175 status = pth_cond_notify( &thelock->lock_released, 0 );
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176 CHECK_STATUS("pth_cond_notify");
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177 }