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annotate Python/thread.c @ 81258:5bb289e4fb35 3.3

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(Merge 3.2) Issue #16455: On FreeBSD and Solaris, if the locale is C, the ASCII/surrogateescape codec is now used, instead of the locale encoding, to decode the command line arguments. This change fixes inconsistencies with os.fsencode() and os.fsdecode() because these operating systems announces an ASCII locale encoding, whereas the ISO-8859-1 encoding is used in practice.
author Victor Stinner <victor.stinner@gmail.com>
date Thu, 03 Jan 2013 01:21:07 +0100
parents f75fd74a0c13
children ffc6e6b00949
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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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8 #include "Python.h"
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9
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10 #ifndef _POSIX_THREADS
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11 /* This means pthreads are not implemented in libc headers, hence the macro
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12 not present in unistd.h. But they still can be implemented as an external
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13 library (e.g. gnu pth in pthread emulation) */
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14 # ifdef HAVE_PTHREAD_H
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15 # include <pthread.h> /* _POSIX_THREADS */
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16 # endif
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17 #endif
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18
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19 #ifndef DONT_HAVE_STDIO_H
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20 #include <stdio.h>
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21 #endif
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22
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23 #include <stdlib.h>
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24
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25 #include "pythread.h"
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27 #ifndef _POSIX_THREADS
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28
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29 /* Check if we're running on HP-UX and _SC_THREADS is defined. If so, then
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30 enough of the Posix threads package is implemented to support python
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31 threads.
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32
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33 This is valid for HP-UX 11.23 running on an ia64 system. If needed, add
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34 a check of __ia64 to verify that we're running on a ia64 system instead
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35 of a pa-risc system.
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36 */
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37 #ifdef __hpux
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38 #ifdef _SC_THREADS
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39 #define _POSIX_THREADS
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40 #endif
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41 #endif
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42
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43 #endif /* _POSIX_THREADS */
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46 #ifdef Py_DEBUG
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47 static int thread_debug = 0;
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48 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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49 #define d2printf(args) ((thread_debug & 8) && printf args)
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50 #else
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51 #define dprintf(args)
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52 #define d2printf(args)
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53 #endif
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54
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55 static int initialized;
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56
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57 static void PyThread__init_thread(void); /* Forward */
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58
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59 void
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60 PyThread_init_thread(void)
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61 {
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62 #ifdef Py_DEBUG
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63 char *p = Py_GETENV("PYTHONTHREADDEBUG");
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64
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65 if (p) {
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66 if (*p)
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67 thread_debug = atoi(p);
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68 else
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69 thread_debug = 1;
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70 }
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71 #endif /* Py_DEBUG */
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72 if (initialized)
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73 return;
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74 initialized = 1;
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75 dprintf(("PyThread_init_thread called\n"));
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76 PyThread__init_thread();
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77 }
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78
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79 /* Support for runtime thread stack size tuning.
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80 A value of 0 means using the platform's default stack size
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81 or the size specified by the THREAD_STACK_SIZE macro. */
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82 static size_t _pythread_stacksize = 0;
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83
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84 #ifdef _POSIX_THREADS
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85 #define PYTHREAD_NAME "pthread"
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86 #include "thread_pthread.h"
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87 #endif
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88
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89 #ifdef NT_THREADS
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90 #define PYTHREAD_NAME "nt"
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91 #include "thread_nt.h"
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92 #endif
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93
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94 #ifdef OS2_THREADS
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95 #define PYTHREAD_NAME "os2"
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96 #include "thread_os2.h"
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97 #endif
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98
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99 /*
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100 #ifdef FOOBAR_THREADS
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101 #include "thread_foobar.h"
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102 #endif
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103 */
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104
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105 /* return the current thread stack size */
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106 size_t
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107 PyThread_get_stacksize(void)
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108 {
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109 return _pythread_stacksize;
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110 }
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111
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112 /* Only platforms defining a THREAD_SET_STACKSIZE() macro
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113 in thread_<platform>.h support changing the stack size.
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114 Return 0 if stack size is valid,
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115 -1 if stack size value is invalid,
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116 -2 if setting stack size is not supported. */
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117 int
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118 PyThread_set_stacksize(size_t size)
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119 {
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120 #if defined(THREAD_SET_STACKSIZE)
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121 return THREAD_SET_STACKSIZE(size);
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122 #else
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123 return -2;
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124 #endif
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125 }
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126
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127 #ifndef Py_HAVE_NATIVE_TLS
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128 /* If the platform has not supplied a platform specific
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129 TLS implementation, provide our own.
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130
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131 This code stolen from "thread_sgi.h", where it was the only
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132 implementation of an existing Python TLS API.
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133 */
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134 /* ------------------------------------------------------------------------
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135 Per-thread data ("key") support.
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136
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137 Use PyThread_create_key() to create a new key. This is typically shared
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138 across threads.
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139
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140 Use PyThread_set_key_value(thekey, value) to associate void* value with
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141 thekey in the current thread. Each thread has a distinct mapping of thekey
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142 to a void* value. Caution: if the current thread already has a mapping
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143 for thekey, value is ignored.
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144
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145 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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146 with thekey in the current thread. This returns NULL if no value is
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147 associated with thekey in the current thread.
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148
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149 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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150 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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151 with thekey across *all* threads.
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152
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153 While some of these functions have error-return values, none set any
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154 Python exception.
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155
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156 None of the functions does memory management on behalf of the void* values.
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157 You need to allocate and deallocate them yourself. If the void* values
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158 happen to be PyObject*, these functions don't do refcount operations on
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159 them either.
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160
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161 The GIL does not need to be held when calling these functions; they supply
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162 their own locking. This isn't true of PyThread_create_key(), though (see
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163 next paragraph).
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164
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165 There's a hidden assumption that PyThread_create_key() will be called before
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166 any of the other functions are called. There's also a hidden assumption
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167 that calls to PyThread_create_key() are serialized externally.
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168 ------------------------------------------------------------------------ */
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169
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170 /* A singly-linked list of struct key objects remembers all the key->value
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171 * associations. File static keyhead heads the list. keymutex is used
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172 * to enforce exclusion internally.
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173 */
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174 struct key {
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175 /* Next record in the list, or NULL if this is the last record. */
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176 struct key *next;
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177
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178 /* The thread id, according to PyThread_get_thread_ident(). */
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179 long id;
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180
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181 /* The key and its associated value. */
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182 int key;
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183 void *value;
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184 };
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185
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186 static struct key *keyhead = NULL;
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187 static PyThread_type_lock keymutex = NULL;
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188 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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189
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190 /* Internal helper.
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191 * If the current thread has a mapping for key, the appropriate struct key*
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192 * is returned. NB: value is ignored in this case!
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193 * If there is no mapping for key in the current thread, then:
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194 * If value is NULL, NULL is returned.
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195 * Else a mapping of key to value is created for the current thread,
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196 * and a pointer to a new struct key* is returned; except that if
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197 * malloc() can't find room for a new struct key*, NULL is returned.
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198 * So when value==NULL, this acts like a pure lookup routine, and when
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199 * value!=NULL, this acts like dict.setdefault(), returning an existing
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200 * mapping if one exists, else creating a new mapping.
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201 *
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202 * Caution: this used to be too clever, trying to hold keymutex only
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203 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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204 * another thread to mutate the list, via key deletion, concurrent with
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205 * find_key() crawling over the list. Hilarity ensued. For example, when
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206 * the for-loop here does "p = p->next", p could end up pointing at a
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207 * record that PyThread_delete_key_value() was concurrently free()'ing.
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208 * That could lead to anything, from failing to find a key that exists, to
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209 * segfaults. Now we lock the whole routine.
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210 */
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211 static struct key *
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212 find_key(int key, void *value)
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213 {
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214 struct key *p, *prev_p;
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215 long id = PyThread_get_thread_ident();
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216
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217 if (!keymutex)
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218 return NULL;
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219 PyThread_acquire_lock(keymutex, 1);
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220 prev_p = NULL;
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221 for (p = keyhead; p != NULL; p = p->next) {
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222 if (p->id == id && p->key == key)
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223 goto Done;
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224 /* Sanity check. These states should never happen but if
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225 * they do we must abort. Otherwise we'll end up spinning in
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226 * in a tight loop with the lock held. A similar check is done
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227 * in pystate.c tstate_delete_common(). */
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228 if (p == prev_p)
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229 Py_FatalError("tls find_key: small circular list(!)");
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230 prev_p = p;
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231 if (p->next == keyhead)
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232 Py_FatalError("tls find_key: circular list(!)");
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233 }
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234 if (value == NULL) {
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235 assert(p == NULL);
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236 goto Done;
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237 }
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238 p = (struct key *)malloc(sizeof(struct key));
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239 if (p != NULL) {
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240 p->id = id;
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241 p->key = key;
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242 p->value = value;
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243 p->next = keyhead;
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244 keyhead = p;
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245 }
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246 Done:
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247 PyThread_release_lock(keymutex);
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248 return p;
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249 }
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250
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251 /* Return a new key. This must be called before any other functions in
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252 * this family, and callers must arrange to serialize calls to this
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253 * function. No violations are detected.
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254 */
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255 int
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256 PyThread_create_key(void)
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257 {
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258 /* All parts of this function are wrong if it's called by multiple
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259 * threads simultaneously.
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260 */
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261 if (keymutex == NULL)
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262 keymutex = PyThread_allocate_lock();
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263 return ++nkeys;
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264 }
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265
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266 /* Forget the associations for key across *all* threads. */
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267 void
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268 PyThread_delete_key(int key)
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269 {
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270 struct key *p, **q;
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271
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272 PyThread_acquire_lock(keymutex, 1);
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273 q = &keyhead;
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274 while ((p = *q) != NULL) {
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275 if (p->key == key) {
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276 *q = p->next;
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277 free((void *)p);
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278 /* NB This does *not* free p->value! */
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279 }
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280 else
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281 q = &p->next;
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282 }
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283 PyThread_release_lock(keymutex);
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284 }
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285
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286 /* Confusing: If the current thread has an association for key,
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287 * value is ignored, and 0 is returned. Else an attempt is made to create
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288 * an association of key to value for the current thread. 0 is returned
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289 * if that succeeds, but -1 is returned if there's not enough memory
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290 * to create the association. value must not be NULL.
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291 */
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292 int
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293 PyThread_set_key_value(int key, void *value)
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294 {
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295 struct key *p;
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296
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297 assert(value != NULL);
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298 p = find_key(key, value);
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299 if (p == NULL)
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300 return -1;
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301 else
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302 return 0;
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303 }
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304
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305 /* Retrieve the value associated with key in the current thread, or NULL
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306 * if the current thread doesn't have an association for key.
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307 */
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308 void *
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309 PyThread_get_key_value(int key)
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310 {
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311 struct key *p = find_key(key, NULL);
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312
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313 if (p == NULL)
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314 return NULL;
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315 else
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316 return p->value;
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317 }
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318
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319 /* Forget the current thread's association for key, if any. */
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320 void
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321 PyThread_delete_key_value(int key)
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322 {
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323 long id = PyThread_get_thread_ident();
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324 struct key *p, **q;
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325
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326 PyThread_acquire_lock(keymutex, 1);
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327 q = &keyhead;
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328 while ((p = *q) != NULL) {
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329 if (p->key == key && p->id == id) {
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330 *q = p->next;
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331 free((void *)p);
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332 /* NB This does *not* free p->value! */
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333 break;
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334 }
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335 else
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336 q = &p->next;
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337 }
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338 PyThread_release_lock(keymutex);
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339 }
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340
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341 /* Forget everything not associated with the current thread id.
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342 * This function is called from PyOS_AfterFork(). It is necessary
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343 * because other thread ids which were in use at the time of the fork
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344 * may be reused for new threads created in the forked process.
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345 */
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346 void
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347 PyThread_ReInitTLS(void)
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348 {
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349 long id = PyThread_get_thread_ident();
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350 struct key *p, **q;
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351
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352 if (!keymutex)
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353 return;
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354
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355 /* As with interpreter_lock in PyEval_ReInitThreads()
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356 we just create a new lock without freeing the old one */
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357 keymutex = PyThread_allocate_lock();
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358
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359 /* Delete all keys which do not match the current thread id */
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360 q = &keyhead;
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361 while ((p = *q) != NULL) {
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362 if (p->id != id) {
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363 *q = p->next;
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364 free((void *)p);
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365 /* NB This does *not* free p->value! */
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366 }
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367 else
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368 q = &p->next;
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369 }
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370 }
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371
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372 #endif /* Py_HAVE_NATIVE_TLS */
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373
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374 PyDoc_STRVAR(threadinfo__doc__,
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375 "sys.thread_info\n\
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376 \n\
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377 A struct sequence holding information about the thread implementation.");
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378
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379 static PyStructSequence_Field threadinfo_fields[] = {
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380 {"name", "name of the thread implementation"},
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381 {"lock", "name of the lock implementation"},
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382 {"version", "name and version of the thread library"},
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383 {0}
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384 };
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385
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386 static PyStructSequence_Desc threadinfo_desc = {
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387 "sys.thread_info", /* name */
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388 threadinfo__doc__, /* doc */
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389 threadinfo_fields, /* fields */
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390 3
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391 };
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392
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393 static PyTypeObject ThreadInfoType;
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394
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395 PyObject*
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396 PyThread_GetInfo(void)
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397 {
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398 PyObject *threadinfo, *value;
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399 int pos = 0;
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400 #if (defined(_POSIX_THREADS) && defined(HAVE_CONFSTR) \
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401 && defined(_CS_GNU_LIBPTHREAD_VERSION))
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402 char buffer[255];
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403 int len;
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404 #endif
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405
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406 if (ThreadInfoType.tp_name == 0)
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407 PyStructSequence_InitType(&ThreadInfoType, &threadinfo_desc);
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408
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409 threadinfo = PyStructSequence_New(&ThreadInfoType);
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410 if (threadinfo == NULL)
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411 return NULL;
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412
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413 value = PyUnicode_FromString(PYTHREAD_NAME);
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414 if (value == NULL) {
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415 Py_DECREF(threadinfo);
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416 return NULL;
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417 }
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418 PyStructSequence_SET_ITEM(threadinfo, pos++, value);
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419
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420 #ifdef _POSIX_THREADS
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421 #ifdef USE_SEMAPHORES
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422 value = PyUnicode_FromString("semaphore");
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423 #else
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424 value = PyUnicode_FromString("mutex+cond");
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425 #endif
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426 if (value == NULL) {
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427 Py_DECREF(threadinfo);
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428 return NULL;
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429 }
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430 #else
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431 Py_INCREF(Py_None);
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432 value = Py_None;
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433 #endif
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434 PyStructSequence_SET_ITEM(threadinfo, pos++, value);
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435
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436 #if (defined(_POSIX_THREADS) && defined(HAVE_CONFSTR) \
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437 && defined(_CS_GNU_LIBPTHREAD_VERSION))
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438 value = NULL;
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439 len = confstr(_CS_GNU_LIBPTHREAD_VERSION, buffer, sizeof(buffer));
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440 if (1 < len && len < sizeof(buffer)) {
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441 value = PyUnicode_DecodeFSDefaultAndSize(buffer, len-1);
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442 if (value == NULL)
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443 PyErr_Clear();
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444 }
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445 if (value == NULL)
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446 #endif
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447 {
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448 Py_INCREF(Py_None);
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449 value = Py_None;
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450 }
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451 PyStructSequence_SET_ITEM(threadinfo, pos++, value);
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452 return threadinfo;
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453 }