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annotate Python/thread.c @ 56727:b54da5caab36

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Disable support for Mach C Threads.
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 24 Oct 2009 20:24:16 +0000
parents 14b55a4e8725
children 0c1238cabe92
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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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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32 #include "pythread.h"
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33
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34 #ifndef _POSIX_THREADS
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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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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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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 = Py_GETENV("PYTHONTHREADDEBUG");
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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 #ifdef SGI_THREADS
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104 #include "thread_sgi.h"
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105 #endif
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106
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107 #ifdef SOLARIS_THREADS
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108 #include "thread_solaris.h"
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109 #endif
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110
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111 #ifdef SUN_LWP
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112 #include "thread_lwp.h"
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113 #endif
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114
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115 #ifdef HAVE_PTH
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116 #include "thread_pth.h"
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117 #undef _POSIX_THREADS
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118 #endif
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119
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120 #ifdef _POSIX_THREADS
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121 #include "thread_pthread.h"
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122 #endif
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123
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124 #ifdef C_THREADS
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125 #error Mach C Threads are now unsupported, and code will be removed in 3.3.
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126 #include "thread_cthread.h"
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127 #endif
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128
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129 #ifdef NT_THREADS
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130 #include "thread_nt.h"
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131 #endif
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132
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133 #ifdef OS2_THREADS
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134 #include "thread_os2.h"
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135 #endif
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136
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137 #ifdef PLAN9_THREADS
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138 #include "thread_plan9.h"
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139 #endif
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140
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141 /*
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142 #ifdef FOOBAR_THREADS
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143 #include "thread_foobar.h"
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144 #endif
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145 */
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146
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147 /* return the current thread stack size */
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148 size_t
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149 PyThread_get_stacksize(void)
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150 {
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151 return _pythread_stacksize;
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152 }
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153
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154 /* Only platforms defining a THREAD_SET_STACKSIZE() macro
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155 in thread_<platform>.h support changing the stack size.
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156 Return 0 if stack size is valid,
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157 -1 if stack size value is invalid,
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158 -2 if setting stack size is not supported. */
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159 int
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160 PyThread_set_stacksize(size_t size)
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161 {
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162 #if defined(THREAD_SET_STACKSIZE)
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163 return THREAD_SET_STACKSIZE(size);
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164 #else
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165 return -2;
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166 #endif
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167 }
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168
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169 #ifndef Py_HAVE_NATIVE_TLS
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170 /* If the platform has not supplied a platform specific
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171 TLS implementation, provide our own.
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172
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173 This code stolen from "thread_sgi.h", where it was the only
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174 implementation of an existing Python TLS API.
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175 */
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176 /* ------------------------------------------------------------------------
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177 Per-thread data ("key") support.
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178
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179 Use PyThread_create_key() to create a new key. This is typically shared
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180 across threads.
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181
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182 Use PyThread_set_key_value(thekey, value) to associate void* value with
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183 thekey in the current thread. Each thread has a distinct mapping of thekey
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184 to a void* value. Caution: if the current thread already has a mapping
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185 for thekey, value is ignored.
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186
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187 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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188 with thekey in the current thread. This returns NULL if no value is
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189 associated with thekey in the current thread.
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190
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191 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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192 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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193 with thekey across *all* threads.
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194
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195 While some of these functions have error-return values, none set any
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196 Python exception.
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197
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198 None of the functions does memory management on behalf of the void* values.
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199 You need to allocate and deallocate them yourself. If the void* values
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200 happen to be PyObject*, these functions don't do refcount operations on
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201 them either.
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202
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203 The GIL does not need to be held when calling these functions; they supply
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204 their own locking. This isn't true of PyThread_create_key(), though (see
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205 next paragraph).
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206
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207 There's a hidden assumption that PyThread_create_key() will be called before
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208 any of the other functions are called. There's also a hidden assumption
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209 that calls to PyThread_create_key() are serialized externally.
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210 ------------------------------------------------------------------------ */
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211
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212 /* A singly-linked list of struct key objects remembers all the key->value
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213 * associations. File static keyhead heads the list. keymutex is used
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214 * to enforce exclusion internally.
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215 */
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216 struct key {
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217 /* Next record in the list, or NULL if this is the last record. */
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218 struct key *next;
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219
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220 /* The thread id, according to PyThread_get_thread_ident(). */
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221 long id;
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222
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223 /* The key and its associated value. */
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224 int key;
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225 void *value;
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226 };
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227
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228 static struct key *keyhead = NULL;
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229 static PyThread_type_lock keymutex = NULL;
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230 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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231
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232 /* Internal helper.
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233 * If the current thread has a mapping for key, the appropriate struct key*
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234 * is returned. NB: value is ignored in this case!
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235 * If there is no mapping for key in the current thread, then:
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236 * If value is NULL, NULL is returned.
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237 * Else a mapping of key to value is created for the current thread,
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238 * and a pointer to a new struct key* is returned; except that if
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239 * malloc() can't find room for a new struct key*, NULL is returned.
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240 * So when value==NULL, this acts like a pure lookup routine, and when
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241 * value!=NULL, this acts like dict.setdefault(), returning an existing
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242 * mapping if one exists, else creating a new mapping.
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243 *
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244 * Caution: this used to be too clever, trying to hold keymutex only
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245 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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246 * another thread to mutate the list, via key deletion, concurrent with
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247 * find_key() crawling over the list. Hilarity ensued. For example, when
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248 * the for-loop here does "p = p->next", p could end up pointing at a
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249 * record that PyThread_delete_key_value() was concurrently free()'ing.
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250 * That could lead to anything, from failing to find a key that exists, to
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251 * segfaults. Now we lock the whole routine.
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252 */
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253 static struct key *
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254 find_key(int key, void *value)
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255 {
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256 struct key *p, *prev_p;
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257 long id = PyThread_get_thread_ident();
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258
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259 if (!keymutex)
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260 return NULL;
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261 PyThread_acquire_lock(keymutex, 1);
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262 prev_p = NULL;
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263 for (p = keyhead; p != NULL; p = p->next) {
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264 if (p->id == id && p->key == key)
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265 goto Done;
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266 /* Sanity check. These states should never happen but if
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267 * they do we must abort. Otherwise we'll end up spinning in
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268 * in a tight loop with the lock held. A similar check is done
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269 * in pystate.c tstate_delete_common(). */
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270 if (p == prev_p)
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271 Py_FatalError("tls find_key: small circular list(!)");
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272 prev_p = p;
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273 if (p->next == keyhead)
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274 Py_FatalError("tls find_key: circular list(!)");
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275 }
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276 if (value == NULL) {
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277 assert(p == NULL);
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278 goto Done;
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279 }
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280 p = (struct key *)malloc(sizeof(struct key));
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281 if (p != NULL) {
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282 p->id = id;
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283 p->key = key;
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284 p->value = value;
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285 p->next = keyhead;
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286 keyhead = p;
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287 }
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288 Done:
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289 PyThread_release_lock(keymutex);
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290 return p;
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291 }
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292
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293 /* Return a new key. This must be called before any other functions in
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294 * this family, and callers must arrange to serialize calls to this
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295 * function. No violations are detected.
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296 */
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297 int
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298 PyThread_create_key(void)
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299 {
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300 /* All parts of this function are wrong if it's called by multiple
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301 * threads simultaneously.
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302 */
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303 if (keymutex == NULL)
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304 keymutex = PyThread_allocate_lock();
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305 return ++nkeys;
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306 }
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307
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308 /* Forget the associations for key across *all* threads. */
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309 void
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310 PyThread_delete_key(int key)
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311 {
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312 struct key *p, **q;
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313
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314 PyThread_acquire_lock(keymutex, 1);
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315 q = &keyhead;
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316 while ((p = *q) != NULL) {
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317 if (p->key == key) {
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318 *q = p->next;
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319 free((void *)p);
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320 /* NB This does *not* free p->value! */
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321 }
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322 else
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323 q = &p->next;
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324 }
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325 PyThread_release_lock(keymutex);
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326 }
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327
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328 /* Confusing: If the current thread has an association for key,
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329 * value is ignored, and 0 is returned. Else an attempt is made to create
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330 * an association of key to value for the current thread. 0 is returned
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331 * if that succeeds, but -1 is returned if there's not enough memory
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332 * to create the association. value must not be NULL.
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333 */
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334 int
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335 PyThread_set_key_value(int key, void *value)
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336 {
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337 struct key *p;
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338
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339 assert(value != NULL);
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340 p = find_key(key, value);
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341 if (p == NULL)
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342 return -1;
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343 else
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344 return 0;
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345 }
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346
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347 /* Retrieve the value associated with key in the current thread, or NULL
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348 * if the current thread doesn't have an association for key.
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349 */
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350 void *
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351 PyThread_get_key_value(int key)
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352 {
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353 struct key *p = find_key(key, NULL);
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354
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355 if (p == NULL)
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356 return NULL;
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357 else
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358 return p->value;
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359 }
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360
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361 /* Forget the current thread's association for key, if any. */
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362 void
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363 PyThread_delete_key_value(int key)
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364 {
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365 long id = PyThread_get_thread_ident();
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366 struct key *p, **q;
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367
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368 PyThread_acquire_lock(keymutex, 1);
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369 q = &keyhead;
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370 while ((p = *q) != NULL) {
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371 if (p->key == key && p->id == id) {
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372 *q = p->next;
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373 free((void *)p);
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374 /* NB This does *not* free p->value! */
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375 break;
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376 }
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377 else
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378 q = &p->next;
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379 }
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380 PyThread_release_lock(keymutex);
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381 }
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382
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383 /* Forget everything not associated with the current thread id.
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384 * This function is called from PyOS_AfterFork(). It is necessary
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385 * because other thread ids which were in use at the time of the fork
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386 * may be reused for new threads created in the forked process.
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387 */
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388 void
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389 PyThread_ReInitTLS(void)
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390 {
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391 long id = PyThread_get_thread_ident();
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392 struct key *p, **q;
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393
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394 if (!keymutex)
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395 return;
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396
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397 /* As with interpreter_lock in PyEval_ReInitThreads()
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398 we just create a new lock without freeing the old one */
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399 keymutex = PyThread_allocate_lock();
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400
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401 /* Delete all keys which do not match the current thread id */
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402 q = &keyhead;
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403 while ((p = *q) != NULL) {
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404 if (p->id != id) {
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405 *q = p->next;
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406 free((void *)p);
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407 /* NB This does *not* free p->value! */
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408 }
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409 else
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410 q = &p->next;
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411 }
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412 }
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413
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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414 #endif /* Py_HAVE_NATIVE_TLS */