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annotate Python/thread_pth.h @ 59857:ec6a995ecfbf

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Merged revisions 79205,79219,79228,79230,79232-79233,79235,79237 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r79205 | benjamin.peterson | 2010-03-21 12:34:54 -0500 (Sun, 21 Mar 2010) | 1 line rewrite a bit ........ r79219 | benjamin.peterson | 2010-03-21 14:24:08 -0500 (Sun, 21 Mar 2010) | 1 line flatten condition ........ r79228 | benjamin.peterson | 2010-03-21 14:35:39 -0500 (Sun, 21 Mar 2010) | 1 line remove pointless condition ........ r79230 | benjamin.peterson | 2010-03-21 14:39:52 -0500 (Sun, 21 Mar 2010) | 1 line co_varnames is certainly a tuple, so let's not waste time finding out ........ r79232 | benjamin.peterson | 2010-03-21 14:54:56 -0500 (Sun, 21 Mar 2010) | 1 line fix import ........ r79233 | benjamin.peterson | 2010-03-21 14:56:37 -0500 (Sun, 21 Mar 2010) | 1 line don't write duplicate tests ........ r79235 | benjamin.peterson | 2010-03-21 15:21:00 -0500 (Sun, 21 Mar 2010) | 4 lines improve error message from passing inadequate number of keyword arguments #6474 Note this removes the "non-keyword" or "keyword" phrases from these messages. ........ r79237 | benjamin.peterson | 2010-03-21 15:30:30 -0500 (Sun, 21 Mar 2010) | 1 line take into account keyword arguments when passing too many args ........
author Benjamin Peterson <benjamin@python.org>
date Sun, 21 Mar 2010 21:00:50 +0000
parents 798e0d0c7246
children fd25030223b0
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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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50
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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 /* Jump through some hoops for Alpha OSF/1 */
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73 threadid = pth_self();
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74 return (long) *(long *) &threadid;
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75 }
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76
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77 void PyThread_exit_thread(void)
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78 {
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79 dprintf(("PyThread_exit_thread called\n"));
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80 if (!initialized) {
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81 exit(0);
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82 }
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83 }
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84
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85 /*
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86 * Lock support.
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87 */
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88 PyThread_type_lock PyThread_allocate_lock(void)
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89 {
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90 pth_lock *lock;
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91 int status, error = 0;
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92
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93 dprintf(("PyThread_allocate_lock called\n"));
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94 if (!initialized)
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95 PyThread_init_thread();
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96
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97 lock = (pth_lock *) malloc(sizeof(pth_lock));
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98 memset((void *)lock, '\0', sizeof(pth_lock));
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99 if (lock) {
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100 lock->locked = 0;
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101 status = pth_mutex_init(&lock->mut);
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102 CHECK_STATUS("pth_mutex_init");
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103 status = pth_cond_init(&lock->lock_released);
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104 CHECK_STATUS("pth_cond_init");
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105 if (error) {
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106 free((void *)lock);
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107 lock = NULL;
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108 }
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109 }
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110 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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111 return (PyThread_type_lock) lock;
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112 }
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113
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114 void PyThread_free_lock(PyThread_type_lock lock)
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115 {
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116 pth_lock *thelock = (pth_lock *)lock;
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117
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118 dprintf(("PyThread_free_lock(%p) called\n", lock));
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119
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120 free((void *)thelock);
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121 }
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122
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123 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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124 {
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125 int success;
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126 pth_lock *thelock = (pth_lock *)lock;
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127 int status, error = 0;
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128
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129 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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130
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131 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
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132 CHECK_STATUS("pth_mutex_acquire[1]");
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133 success = thelock->locked == 0;
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134 if (success) thelock->locked = 1;
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135 status = pth_mutex_release( &thelock->mut );
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136 CHECK_STATUS("pth_mutex_release[1]");
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137
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138 if ( !success && waitflag ) {
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139 /* continue trying until we get the lock */
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140
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141 /* mut must be locked by me -- part of the condition
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142 * protocol */
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143 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
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144 CHECK_STATUS("pth_mutex_acquire[2]");
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145 while ( thelock->locked ) {
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146 status = pth_cond_await(&thelock->lock_released,
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147 &thelock->mut, NULL);
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148 CHECK_STATUS("pth_cond_await");
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149 }
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150 thelock->locked = 1;
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151 status = pth_mutex_release( &thelock->mut );
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152 CHECK_STATUS("pth_mutex_release[2]");
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153 success = 1;
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154 }
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155 if (error) success = 0;
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156 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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157 return success;
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158 }
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159
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160 void PyThread_release_lock(PyThread_type_lock lock)
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161 {
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162 pth_lock *thelock = (pth_lock *)lock;
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163 int status, error = 0;
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164
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165 dprintf(("PyThread_release_lock(%p) called\n", lock));
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166
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167 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
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168 CHECK_STATUS("pth_mutex_acquire[3]");
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169
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170 thelock->locked = 0;
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171
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172 status = pth_mutex_release( &thelock->mut );
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173 CHECK_STATUS("pth_mutex_release[3]");
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174
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175 /* wake up someone (anyone, if any) waiting on the lock */
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176 status = pth_cond_notify( &thelock->lock_released, 0 );
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177 CHECK_STATUS("pth_cond_notify");
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178 }