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annotate Python/thread.c @ 35752:47496e7dbf2f legacy-trunk

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Fix SF bug #1167751, Argument genexp corner case Incorrect code was generated for: foo(a = i for i in range(10)) This should have generated a SyntaxError. Fix the Grammar so it raises a SyntaxError and test it. I'm uncertain whether this should be backported. It makes something that was Syntactically valid invalid. However, the code would either be completely broken or do the wrong thing.
author Neal Norwitz <nnorwitz@gmail.com>
date Fri, 21 Oct 2005 06:24:02 +0000
parents b19cf73c54a7
children 0b2b076e5908 a19c20c5e5c7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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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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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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78 void PyThread_init_thread(void)
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79 {
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80 #ifdef Py_DEBUG
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81 char *p = getenv("THREADDEBUG");
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82
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83 if (p) {
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84 if (*p)
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85 thread_debug = atoi(p);
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86 else
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87 thread_debug = 1;
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88 }
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89 #endif /* Py_DEBUG */
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90 if (initialized)
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91 return;
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92 initialized = 1;
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93 dprintf(("PyThread_init_thread called\n"));
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94 PyThread__init_thread();
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95 }
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96
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97 #ifdef SGI_THREADS
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98 #include "thread_sgi.h"
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99 #endif
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101 #ifdef SOLARIS_THREADS
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102 #include "thread_solaris.h"
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103 #endif
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104
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105 #ifdef SUN_LWP
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106 #include "thread_lwp.h"
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107 #endif
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108
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109 #ifdef HAVE_PTH
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110 #include "thread_pth.h"
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111 #undef _POSIX_THREADS
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112 #endif
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114 #ifdef _POSIX_THREADS
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115 #include "thread_pthread.h"
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116 #endif
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117
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118 #ifdef C_THREADS
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119 #include "thread_cthread.h"
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120 #endif
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121
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122 #ifdef NT_THREADS
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123 #include "thread_nt.h"
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124 #endif
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125
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126 #ifdef OS2_THREADS
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127 #include "thread_os2.h"
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128 #endif
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129
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130 #ifdef BEOS_THREADS
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131 #include "thread_beos.h"
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132 #endif
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133
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134 #ifdef WINCE_THREADS
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135 #include "thread_wince.h"
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136 #endif
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137
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138 #ifdef PLAN9_THREADS
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139 #include "thread_plan9.h"
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140 #endif
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141
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142 #ifdef ATHEOS_THREADS
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143 #include "thread_atheos.h"
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144 #endif
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145
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146 /*
1848
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147 #ifdef FOOBAR_THREADS
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148 #include "thread_foobar.h"
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149 #endif
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150 */
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151
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152 #ifndef Py_HAVE_NATIVE_TLS
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153 /* If the platform has not supplied a platform specific
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154 TLS implementation, provide our own.
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155
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156 This code stolen from "thread_sgi.h", where it was the only
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157 implementation of an existing Python TLS API.
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158 */
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159 /* ------------------------------------------------------------------------
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160 Per-thread data ("key") support.
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161
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162 Use PyThread_create_key() to create a new key. This is typically shared
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163 across threads.
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164
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165 Use PyThread_set_key_value(thekey, value) to associate void* value with
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166 thekey in the current thread. Each thread has a distinct mapping of thekey
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167 to a void* value. Caution: if the current thread already has a mapping
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168 for thekey, value is ignored.
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169
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170 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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171 with thekey in the current thread. This returns NULL if no value is
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172 associated with thekey in the current thread.
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173
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174 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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175 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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176 with thekey across *all* threads.
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177
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178 While some of these functions have error-return values, none set any
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179 Python exception.
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180
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181 None of the functions does memory management on behalf of the void* values.
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182 You need to allocate and deallocate them yourself. If the void* values
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183 happen to be PyObject*, these functions don't do refcount operations on
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184 them either.
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185
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186 The GIL does not need to be held when calling these functions; they supply
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187 their own locking. This isn't true of PyThread_create_key(), though (see
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188 next paragraph).
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189
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190 There's a hidden assumption that PyThread_create_key() will be called before
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191 any of the other functions are called. There's also a hidden assumption
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192 that calls to PyThread_create_key() are serialized externally.
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193 ------------------------------------------------------------------------ */
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194
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195 /* A singly-linked list of struct key objects remembers all the key->value
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196 * associations. File static keyhead heads the list. keymutex is used
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197 * to enforce exclusion internally.
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198 */
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199 struct key {
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200 /* Next record in the list, or NULL if this is the last record. */
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201 struct key *next;
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202
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203 /* The thread id, according to PyThread_get_thread_ident(). */
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204 long id;
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205
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206 /* The key and its associated value. */
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207 int key;
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208 void *value;
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209 };
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210
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211 static struct key *keyhead = NULL;
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212 static PyThread_type_lock keymutex = NULL;
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213 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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214
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215 /* Internal helper.
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216 * If the current thread has a mapping for key, the appropriate struct key*
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217 * is returned. NB: value is ignored in this case!
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218 * If there is no mapping for key in the current thread, then:
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219 * If value is NULL, NULL is returned.
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220 * Else a mapping of key to value is created for the current thread,
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221 * and a pointer to a new struct key* is returned; except that if
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222 * malloc() can't find room for a new struct key*, NULL is returned.
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223 * So when value==NULL, this acts like a pure lookup routine, and when
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224 * value!=NULL, this acts like dict.setdefault(), returning an existing
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225 * mapping if one exists, else creating a new mapping.
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226 *
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227 * Caution: this used to be too clever, trying to hold keymutex only
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228 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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229 * another thread to mutate the list, via key deletion, concurrent with
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230 * find_key() crawling over the list. Hilarity ensued. For example, when
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231 * the for-loop here does "p = p->next", p could end up pointing at a
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232 * record that PyThread_delete_key_value() was concurrently free()'ing.
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233 * That could lead to anything, from failing to find a key that exists, to
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234 * segfaults. Now we lock the whole routine.
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235 */
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236 static struct key *
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237 find_key(int key, void *value)
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238 {
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239 struct key *p;
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240 long id = PyThread_get_thread_ident();
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241
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242 PyThread_acquire_lock(keymutex, 1);
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243 for (p = keyhead; p != NULL; p = p->next) {
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244 if (p->id == id && p->key == key)
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245 goto Done;
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246 }
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247 if (value == NULL) {
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248 assert(p == NULL);
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249 goto Done;
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250 }
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251 p = (struct key *)malloc(sizeof(struct key));
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252 if (p != NULL) {
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253 p->id = id;
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254 p->key = key;
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255 p->value = value;
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256 p->next = keyhead;
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257 keyhead = p;
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258 }
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259 Done:
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260 PyThread_release_lock(keymutex);
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261 return p;
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262 }
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263
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264 /* Return a new key. This must be called before any other functions in
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265 * this family, and callers must arrange to serialize calls to this
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266 * function. No violations are detected.
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267 */
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268 int
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269 PyThread_create_key(void)
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270 {
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271 /* All parts of this function are wrong if it's called by multiple
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272 * threads simultaneously.
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273 */
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274 if (keymutex == NULL)
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275 keymutex = PyThread_allocate_lock();
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276 return ++nkeys;
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277 }
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278
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279 /* Forget the associations for key across *all* threads. */
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280 void
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281 PyThread_delete_key(int key)
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282 {
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283 struct key *p, **q;
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284
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285 PyThread_acquire_lock(keymutex, 1);
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286 q = &keyhead;
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287 while ((p = *q) != NULL) {
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288 if (p->key == key) {
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289 *q = p->next;
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290 free((void *)p);
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291 /* NB This does *not* free p->value! */
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292 }
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293 else
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294 q = &p->next;
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295 }
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296 PyThread_release_lock(keymutex);
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297 }
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298
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299 /* Confusing: If the current thread has an association for key,
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300 * value is ignored, and 0 is returned. Else an attempt is made to create
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301 * an association of key to value for the current thread. 0 is returned
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302 * if that succeeds, but -1 is returned if there's not enough memory
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303 * to create the association. value must not be NULL.
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304 */
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305 int
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306 PyThread_set_key_value(int key, void *value)
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307 {
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308 struct key *p;
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309
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310 assert(value != NULL);
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311 p = find_key(key, value);
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312 if (p == NULL)
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313 return -1;
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314 else
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315 return 0;
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316 }
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317
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318 /* Retrieve the value associated with key in the current thread, or NULL
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319 * if the current thread doesn't have an association for key.
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320 */
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321 void *
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322 PyThread_get_key_value(int key)
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323 {
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324 struct key *p = find_key(key, NULL);
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325
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326 if (p == NULL)
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327 return NULL;
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328 else
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329 return p->value;
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330 }
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331
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332 /* Forget the current thread's association for key, if any. */
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333 void
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334 PyThread_delete_key_value(int key)
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335 {
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336 long id = PyThread_get_thread_ident();
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337 struct key *p, **q;
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338
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339 PyThread_acquire_lock(keymutex, 1);
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340 q = &keyhead;
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341 while ((p = *q) != NULL) {
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342 if (p->key == key && p->id == id) {
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343 *q = p->next;
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344 free((void *)p);
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345 /* NB This does *not* free p->value! */
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346 break;
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347 }
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348 else
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349 q = &p->next;
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350 }
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351 PyThread_release_lock(keymutex);
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352 }
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353
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354 #endif /* Py_HAVE_NATIVE_TLS */