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annotate Python/thread_pth.h @ 58664:993f703a61ba

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Merged revisions 77484,77487,77561,77570,77593,77603,77608,77667,77702-77703,77739,77858,77887,77889 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77484 | skip.montanaro | 2010-01-13 19:12:34 -0600 (Wed, 13 Jan 2010) | 4 lines Update PyEval_EvalFrame to PyEval_EvalFrameEx. This looks to have been done partially before. Also add a comment describing how this might have to work with different versions of the interpreter. ........ r77487 | ezio.melotti | 2010-01-14 05:34:10 -0600 (Thu, 14 Jan 2010) | 1 line Fixed typo ........ r77561 | georg.brandl | 2010-01-17 02:42:30 -0600 (Sun, 17 Jan 2010) | 1 line #7699: improve datetime docs: straightforward linking to strftime/strptime section, mark classmethods as such. ........ r77570 | georg.brandl | 2010-01-17 06:14:42 -0600 (Sun, 17 Jan 2010) | 1 line Add note about usage of STRINGLIB_EMPTY. ........ r77593 | georg.brandl | 2010-01-17 17:33:53 -0600 (Sun, 17 Jan 2010) | 1 line Fix internal reference. ........ r77603 | benjamin.peterson | 2010-01-18 17:07:56 -0600 (Mon, 18 Jan 2010) | 8 lines data descriptors do not override the class dictionary if __get__ is not defined Adjust documentation and add a test to verify this behavior. See http://mail.python.org/pipermail/python-dev/2010-January/095637.html for discussion. ........ r77608 | gregory.p.smith | 2010-01-19 02:19:03 -0600 (Tue, 19 Jan 2010) | 6 lines Do not compile stubs for the sha2 series hashes in the openssl hashlib module when the openssl version is too old to support them. That leads both compiled code bloat and to unittests attempting to test implementations that don't exist for comparison purposes on such platforms. ........ r77667 | mark.dickinson | 2010-01-21 12:32:27 -0600 (Thu, 21 Jan 2010) | 1 line Add two more test_strtod test values. ........ r77702 | georg.brandl | 2010-01-23 02:43:31 -0600 (Sat, 23 Jan 2010) | 1 line #7762: fix refcount annotation of PyUnicode_Tailmatch(). ........ r77703 | georg.brandl | 2010-01-23 02:47:54 -0600 (Sat, 23 Jan 2010) | 1 line #7725: fix referencing issue. ........ r77739 | benjamin.peterson | 2010-01-24 21:52:52 -0600 (Sun, 24 Jan 2010) | 1 line mention from_float() in error message ........ r77858 | georg.brandl | 2010-01-30 11:57:48 -0600 (Sat, 30 Jan 2010) | 1 line #7802: fix invalid example (heh). ........ r77887 | georg.brandl | 2010-01-31 12:51:49 -0600 (Sun, 31 Jan 2010) | 5 lines Fix-up ftplib documentation: move exception descriptions to toplevel, not inside a class remove attribution in "versionadded" spell and grammar check docstring of FTP_TLS ........ r77889 | michael.foord | 2010-01-31 13:59:26 -0600 (Sun, 31 Jan 2010) | 1 line Minor modification to unittest documentation. ........
author Benjamin Peterson <benjamin@python.org>
date Wed, 03 Feb 2010 02:35:45 +0000
parents 1a817694ecbd
children e38335d4df91 df5719c298db
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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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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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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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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 static void do_PyThread_exit_thread(int no_cleanup)
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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 if (no_cleanup)
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82 _exit(0);
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83 else
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84 exit(0);
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85 }
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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(0);
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91 }
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92
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93 void PyThread__exit_thread(void)
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94 {
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95 do_PyThread_exit_thread(1);
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96 }
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97
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98 #ifndef NO_EXIT_PROG
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99 static void do_PyThread_exit_prog(int status, int no_cleanup)
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100 {
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101 dprintf(("PyThread_exit_prog(%d) called\n", status));
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102 if (!initialized)
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103 if (no_cleanup)
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104 _exit(status);
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105 else
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106 exit(status);
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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, 0);
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112 }
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113
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114 void PyThread__exit_prog(int status)
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115 {
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116 do_PyThread_exit_prog(status, 1);
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117 }
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118 #endif /* NO_EXIT_PROG */
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119
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120 /*
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121 * Lock support.
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122 */
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123 PyThread_type_lock PyThread_allocate_lock(void)
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124 {
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125 pth_lock *lock;
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126 int status, error = 0;
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127
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128 dprintf(("PyThread_allocate_lock called\n"));
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129 if (!initialized)
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130 PyThread_init_thread();
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131
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132 lock = (pth_lock *) malloc(sizeof(pth_lock));
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133 memset((void *)lock, '\0', sizeof(pth_lock));
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134 if (lock) {
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135 lock->locked = 0;
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136 status = pth_mutex_init(&lock->mut);
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137 CHECK_STATUS("pth_mutex_init");
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138 status = pth_cond_init(&lock->lock_released);
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139 CHECK_STATUS("pth_cond_init");
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140 if (error) {
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141 free((void *)lock);
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142 lock = NULL;
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143 }
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144 }
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145 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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146 return (PyThread_type_lock) lock;
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147 }
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148
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149 void PyThread_free_lock(PyThread_type_lock lock)
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150 {
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151 pth_lock *thelock = (pth_lock *)lock;
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152
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153 dprintf(("PyThread_free_lock(%p) called\n", lock));
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154
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155 free((void *)thelock);
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156 }
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157
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158 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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159 {
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160 int success;
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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_acquire_lock(%p, %d) called\n", lock, waitflag));
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165
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166 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
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167 CHECK_STATUS("pth_mutex_acquire[1]");
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168 success = thelock->locked == 0;
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169 if (success) thelock->locked = 1;
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170 status = pth_mutex_release( &thelock->mut );
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171 CHECK_STATUS("pth_mutex_release[1]");
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172
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173 if ( !success && waitflag ) {
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174 /* continue trying until we get the lock */
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175
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176 /* mut must be locked by me -- part of the condition
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177 * protocol */
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178 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
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179 CHECK_STATUS("pth_mutex_acquire[2]");
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180 while ( thelock->locked ) {
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181 status = pth_cond_await(&thelock->lock_released,
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182 &thelock->mut, NULL);
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183 CHECK_STATUS("pth_cond_await");
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184 }
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185 thelock->locked = 1;
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186 status = pth_mutex_release( &thelock->mut );
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187 CHECK_STATUS("pth_mutex_release[2]");
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188 success = 1;
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189 }
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190 if (error) success = 0;
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191 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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192 return success;
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193 }
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194
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195 void PyThread_release_lock(PyThread_type_lock lock)
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196 {
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197 pth_lock *thelock = (pth_lock *)lock;
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198 int status, error = 0;
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199
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200 dprintf(("PyThread_release_lock(%p) called\n", lock));
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201
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202 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
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203 CHECK_STATUS("pth_mutex_acquire[3]");
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204
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205 thelock->locked = 0;
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206
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207 status = pth_mutex_release( &thelock->mut );
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208 CHECK_STATUS("pth_mutex_release[3]");
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209
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210 /* wake up someone (anyone, if any) waiting on the lock */
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211 status = pth_cond_notify( &thelock->lock_released, 0 );
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212 CHECK_STATUS("pth_cond_notify");
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213 }