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annotate Python/thread.c @ 38579:19430cdff2bd legacy-trunk

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clean up function declarations to conform to PEP-7 style.
author Andrew MacIntyre <andymac@bullseye.apana.org.au>
date Sun, 04 Jun 2006 12:59:59 +0000
parents 0b2b076e5908
children c4587a5f5e94
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1198
2937897a7d8b * Added Fixcprt.py: script to fix copyright message.
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1
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2 /* Thread package.
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3 This is intended to be usable independently from Python.
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4 The implementation for system foobar is in a file thread_foobar.h
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5 which is included by this file dependent on config settings.
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6 Stuff shared by all thread_*.h files is collected here. */
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7
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c64fc56f6072 Include <unistd.h> in Python.h. Fixes #500924.
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8 #include "Python.h"
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9
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10
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11 #ifndef _POSIX_THREADS
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12 /* This means pthreads are not implemented in libc headers, hence the macro
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13 not present in unistd.h. But they still can be implemented as an external
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14 library (e.g. gnu pth in pthread emulation) */
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15 # ifdef HAVE_PTHREAD_H
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16 # include <pthread.h> /* _POSIX_THREADS */
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17 # endif
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18 #endif
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19
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d834ecdf8c26 Changes by Mark Hammond for Windows CE. Mostly of the form
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20 #ifndef DONT_HAVE_STDIO_H
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21 #include <stdio.h>
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22 #endif
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23
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24 #include <stdlib.h>
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25
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26 #ifdef __sgi
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27 #ifndef HAVE_PTHREAD_H /* XXX Need to check in configure.in */
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28 #undef _POSIX_THREADS
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29 #endif
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30 #endif
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31
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07dae6fdae79 Renamed thread.h to pythread.h.
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32 #include "pythread.h"
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33
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34 #ifndef _POSIX_THREADS
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35
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36 #ifdef __sgi
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37 #define SGI_THREADS
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38 #endif
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39
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40 #ifdef HAVE_THREAD_H
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41 #define SOLARIS_THREADS
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42 #endif
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43
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44 #if defined(sun) && !defined(SOLARIS_THREADS)
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45 #define SUN_LWP
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46 #endif
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47
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48 /* Check if we're running on HP-UX and _SC_THREADS is defined. If so, then
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49 enough of the Posix threads package is implimented to support python
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50 threads.
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51
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52 This is valid for HP-UX 11.23 running on an ia64 system. If needed, add
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53 a check of __ia64 to verify that we're running on a ia64 system instead
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54 of a pa-risc system.
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55 */
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56 #ifdef __hpux
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57 #ifdef _SC_THREADS
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58 #define _POSIX_THREADS
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59 #endif
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60 #endif
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61
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62 #endif /* _POSIX_THREADS */
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64
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65 #ifdef Py_DEBUG
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66 static int thread_debug = 0;
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67 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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68 #define d2printf(args) ((thread_debug & 8) && printf args)
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69 #else
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70 #define dprintf(args)
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71 #define d2printf(args)
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72 #endif
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73
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74 static int initialized;
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75
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9db86b27278f Prototype yet another forward declaration.
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76 static void PyThread__init_thread(void); /* Forward */
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77
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78 void
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79 PyThread_init_thread(void)
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80 {
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81 #ifdef Py_DEBUG
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82 char *p = getenv("THREADDEBUG");
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83
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84 if (p) {
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85 if (*p)
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86 thread_debug = atoi(p);
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87 else
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88 thread_debug = 1;
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89 }
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90 #endif /* Py_DEBUG */
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91 if (initialized)
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92 return;
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93 initialized = 1;
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94 dprintf(("PyThread_init_thread called\n"));
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95 PyThread__init_thread();
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96 }
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97
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98 /* Support for runtime thread stack size tuning.
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99 A value of 0 means using the platform's default stack size
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100 or the size specified by the THREAD_STACK_SIZE macro. */
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101 static size_t _pythread_stacksize = 0;
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102
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103 size_t
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104 PyThread_get_stacksize(void)
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105 {
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106 return _pythread_stacksize;
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107 }
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108
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109 static int
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110 _pythread_unsupported_set_stacksize(size_t size)
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111 {
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112 return PyErr_Warn(PyExc_RuntimeWarning,
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113 "setting thread stack size not supported on "
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114 "this platform");
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115 }
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116
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117 /* Only platforms with THREAD_SET_STACKSIZE() defined in
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118 pthread_<platform>.h, overriding this default definition,
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119 will support changing the stack size.
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120 Return 1 if an exception is pending, 0 otherwise. */
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121 #define THREAD_SET_STACKSIZE(x) _pythread_unsupported_set_stacksize(x)
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122
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123 #ifdef SGI_THREADS
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124 #include "thread_sgi.h"
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125 #endif
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126
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127 #ifdef SOLARIS_THREADS
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128 #include "thread_solaris.h"
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129 #endif
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130
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131 #ifdef SUN_LWP
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132 #include "thread_lwp.h"
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133 #endif
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134
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135 #ifdef HAVE_PTH
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136 #include "thread_pth.h"
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137 #undef _POSIX_THREADS
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138 #endif
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139
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140 #ifdef _POSIX_THREADS
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141 #include "thread_pthread.h"
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142 #endif
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143
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144 #ifdef C_THREADS
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145 #include "thread_cthread.h"
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146 #endif
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147
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148 #ifdef NT_THREADS
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149 #include "thread_nt.h"
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150 #endif
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151
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152 #ifdef OS2_THREADS
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153 #include "thread_os2.h"
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154 #endif
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155
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156 #ifdef BEOS_THREADS
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157 #include "thread_beos.h"
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158 #endif
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159
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160 #ifdef WINCE_THREADS
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161 #include "thread_wince.h"
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162 #endif
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163
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164 #ifdef PLAN9_THREADS
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165 #include "thread_plan9.h"
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166 #endif
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167
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168 #ifdef ATHEOS_THREADS
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169 #include "thread_atheos.h"
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170 #endif
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171
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172 /*
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173 #ifdef FOOBAR_THREADS
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174 #include "thread_foobar.h"
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175 #endif
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176 */
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177
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178 /* use appropriate thread stack size setting routine.
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179 Return 1 if an exception is pending, 0 otherwise. */
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180 int
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181 PyThread_set_stacksize(size_t size)
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182 {
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183 return THREAD_SET_STACKSIZE(size);
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184 }
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185
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186 #ifndef Py_HAVE_NATIVE_TLS
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187 /* If the platform has not supplied a platform specific
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188 TLS implementation, provide our own.
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189
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190 This code stolen from "thread_sgi.h", where it was the only
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191 implementation of an existing Python TLS API.
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192 */
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193 /* ------------------------------------------------------------------------
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194 Per-thread data ("key") support.
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195
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196 Use PyThread_create_key() to create a new key. This is typically shared
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197 across threads.
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198
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199 Use PyThread_set_key_value(thekey, value) to associate void* value with
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200 thekey in the current thread. Each thread has a distinct mapping of thekey
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201 to a void* value. Caution: if the current thread already has a mapping
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202 for thekey, value is ignored.
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203
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204 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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205 with thekey in the current thread. This returns NULL if no value is
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206 associated with thekey in the current thread.
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207
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208 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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209 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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210 with thekey across *all* threads.
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211
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212 While some of these functions have error-return values, none set any
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213 Python exception.
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214
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215 None of the functions does memory management on behalf of the void* values.
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216 You need to allocate and deallocate them yourself. If the void* values
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217 happen to be PyObject*, these functions don't do refcount operations on
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218 them either.
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219
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220 The GIL does not need to be held when calling these functions; they supply
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221 their own locking. This isn't true of PyThread_create_key(), though (see
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222 next paragraph).
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223
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224 There's a hidden assumption that PyThread_create_key() will be called before
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225 any of the other functions are called. There's also a hidden assumption
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226 that calls to PyThread_create_key() are serialized externally.
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227 ------------------------------------------------------------------------ */
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228
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229 /* A singly-linked list of struct key objects remembers all the key->value
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230 * associations. File static keyhead heads the list. keymutex is used
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231 * to enforce exclusion internally.
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232 */
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233 struct key {
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234 /* Next record in the list, or NULL if this is the last record. */
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235 struct key *next;
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236
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237 /* The thread id, according to PyThread_get_thread_ident(). */
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238 long id;
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239
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240 /* The key and its associated value. */
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241 int key;
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242 void *value;
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243 };
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244
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245 static struct key *keyhead = NULL;
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246 static PyThread_type_lock keymutex = NULL;
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247 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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248
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249 /* Internal helper.
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250 * If the current thread has a mapping for key, the appropriate struct key*
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251 * is returned. NB: value is ignored in this case!
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252 * If there is no mapping for key in the current thread, then:
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253 * If value is NULL, NULL is returned.
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254 * Else a mapping of key to value is created for the current thread,
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255 * and a pointer to a new struct key* is returned; except that if
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256 * malloc() can't find room for a new struct key*, NULL is returned.
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257 * So when value==NULL, this acts like a pure lookup routine, and when
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258 * value!=NULL, this acts like dict.setdefault(), returning an existing
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259 * mapping if one exists, else creating a new mapping.
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260 *
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261 * Caution: this used to be too clever, trying to hold keymutex only
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262 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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263 * another thread to mutate the list, via key deletion, concurrent with
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264 * find_key() crawling over the list. Hilarity ensued. For example, when
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265 * the for-loop here does "p = p->next", p could end up pointing at a
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266 * record that PyThread_delete_key_value() was concurrently free()'ing.
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267 * That could lead to anything, from failing to find a key that exists, to
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268 * segfaults. Now we lock the whole routine.
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269 */
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270 static struct key *
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271 find_key(int key, void *value)
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272 {
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273 struct key *p;
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274 long id = PyThread_get_thread_ident();
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275
33712
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276 PyThread_acquire_lock(keymutex, 1);
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277 for (p = keyhead; p != NULL; p = p->next) {
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278 if (p->id == id && p->key == key)
33712
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279 goto Done;
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280 }
33712
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281 if (value == NULL) {
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282 assert(p == NULL);
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
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283 goto Done;
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
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284 }
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285 p = (struct key *)malloc(sizeof(struct key));
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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286 if (p != NULL) {
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287 p->id = id;
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288 p->key = key;
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289 p->value = value;
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290 p->next = keyhead;
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291 keyhead = p;
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292 }
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
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293 Done:
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
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294 PyThread_release_lock(keymutex);
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295 return p;
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296 }
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297
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298 /* Return a new key. This must be called before any other functions in
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299 * this family, and callers must arrange to serialize calls to this
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300 * function. No violations are detected.
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301 */
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302 int
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303 PyThread_create_key(void)
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304 {
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305 /* All parts of this function are wrong if it's called by multiple
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306 * threads simultaneously.
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307 */
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308 if (keymutex == NULL)
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309 keymutex = PyThread_allocate_lock();
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310 return ++nkeys;
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311 }
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312
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313 /* Forget the associations for key across *all* threads. */
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314 void
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315 PyThread_delete_key(int key)
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316 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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317 struct key *p, **q;
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diff changeset
318
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diff changeset
319 PyThread_acquire_lock(keymutex, 1);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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320 q = &keyhead;
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diff changeset
321 while ((p = *q) != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
322 if (p->key == key) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
323 *q = p->next;
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diff changeset
324 free((void *)p);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
325 /* NB This does *not* free p->value! */
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diff changeset
326 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
327 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
328 q = &p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
329 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
330 PyThread_release_lock(keymutex);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
331 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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diff changeset
332
33705
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diff changeset
333 /* Confusing: If the current thread has an association for key,
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
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parents: 33699
diff changeset
334 * value is ignored, and 0 is returned. Else an attempt is made to create
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
335 * an association of key to value for the current thread. 0 is returned
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
336 * if that succeeds, but -1 is returned if there's not enough memory
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
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diff changeset
337 * to create the association. value must not be NULL.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
338 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
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diff changeset
339 int
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
340 PyThread_set_key_value(int key, void *value)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
341 {
33705
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diff changeset
342 struct key *p;
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
343
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
344 assert(value != NULL);
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
345 p = find_key(key, value);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
346 if (p == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
347 return -1;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
348 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
349 return 0;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
350 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
351
33705
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diff changeset
352 /* Retrieve the value associated with key in the current thread, or NULL
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
353 * if the current thread doesn't have an association for key.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
354 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
355 void *
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
356 PyThread_get_key_value(int key)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
357 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
358 struct key *p = find_key(key, NULL);
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
359
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
360 if (p == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
361 return NULL;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
362 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
363 return p->value;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
364 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
365
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
366 /* Forget the current thread's association for key, if any. */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
367 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
368 PyThread_delete_key_value(int key)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
369 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
370 long id = PyThread_get_thread_ident();
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
371 struct key *p, **q;
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
372
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
373 PyThread_acquire_lock(keymutex, 1);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
374 q = &keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
375 while ((p = *q) != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
376 if (p->key == key && p->id == id) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
377 *q = p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
378 free((void *)p);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
379 /* NB This does *not* free p->value! */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
380 break;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
381 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
382 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
383 q = &p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
384 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
385 PyThread_release_lock(keymutex);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
386 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
387
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
388 #endif /* Py_HAVE_NATIVE_TLS */