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annotate Python/thread_pthread.h @ 81257:c256764e2b3f 3.2

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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 01:08:58 +0100
parents 280469ce6669
children 470785a9fdd5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Posix threads interface */
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3
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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7 #define destructor xxdestructor
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8 #endif
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9 #include <pthread.h>
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10 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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11 #undef destructor
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12 #endif
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13 #include <signal.h>
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14
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15 /* The POSIX spec requires that use of pthread_attr_setstacksize
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16 be conditional on _POSIX_THREAD_ATTR_STACKSIZE being defined. */
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17 #ifdef _POSIX_THREAD_ATTR_STACKSIZE
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18 #ifndef THREAD_STACK_SIZE
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19 #define THREAD_STACK_SIZE 0 /* use default stack size */
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20 #endif
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21
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22 /* The default stack size for new threads on OSX and BSD is small enough that
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23 * we'll get hard crashes instead of 'maximum recursion depth exceeded'
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24 * exceptions.
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25 *
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26 * The default stack sizes below are the empirically determined minimal stack
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27 * sizes where a simple recursive function doesn't cause a hard crash.
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28 */
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29 #if defined(__APPLE__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
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30 #undef THREAD_STACK_SIZE
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31 #define THREAD_STACK_SIZE 0x500000
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32 #endif
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33 #if defined(__FreeBSD__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
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34 #undef THREAD_STACK_SIZE
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35 #define THREAD_STACK_SIZE 0x400000
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36 #endif
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37 /* for safety, ensure a viable minimum stacksize */
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38 #define THREAD_STACK_MIN 0x8000 /* 32kB */
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39 #else /* !_POSIX_THREAD_ATTR_STACKSIZE */
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40 #ifdef THREAD_STACK_SIZE
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41 #error "THREAD_STACK_SIZE defined but _POSIX_THREAD_ATTR_STACKSIZE undefined"
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42 #endif
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43 #endif
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45 /* The POSIX spec says that implementations supporting the sem_*
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46 family of functions must indicate this by defining
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47 _POSIX_SEMAPHORES. */
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48 #ifdef _POSIX_SEMAPHORES
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49 /* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so
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50 we need to add 0 to make it work there as well. */
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51 #if (_POSIX_SEMAPHORES+0) == -1
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52 #define HAVE_BROKEN_POSIX_SEMAPHORES
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53 #else
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54 #include <semaphore.h>
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55 #include <errno.h>
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56 #endif
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57 #endif
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58
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59 /* Before FreeBSD 5.4, system scope threads was very limited resource
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60 in default setting. So the process scope is preferred to get
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61 enough number of threads to work. */
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62 #ifdef __FreeBSD__
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63 #include <osreldate.h>
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64 #if __FreeBSD_version >= 500000 && __FreeBSD_version < 504101
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65 #undef PTHREAD_SYSTEM_SCHED_SUPPORTED
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66 #endif
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67 #endif
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68
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69 #if !defined(pthread_attr_default)
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70 # define pthread_attr_default ((pthread_attr_t *)NULL)
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71 #endif
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72 #if !defined(pthread_mutexattr_default)
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73 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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74 #endif
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75 #if !defined(pthread_condattr_default)
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76 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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77 #endif
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80 /* Whether or not to use semaphores directly rather than emulating them with
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81 * mutexes and condition variables:
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82 */
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83 #if (defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES) && \
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84 defined(HAVE_SEM_TIMEDWAIT))
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85 # define USE_SEMAPHORES
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86 #else
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87 # undef USE_SEMAPHORES
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88 #endif
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89
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90
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91 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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92 * isn't present. DEC threads uses sigprocmask() instead as do most
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93 * other UNIX International compliant systems that don't have the full
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94 * pthread implementation.
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95 */
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96 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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97 # define SET_THREAD_SIGMASK pthread_sigmask
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98 #else
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99 # define SET_THREAD_SIGMASK sigprocmask
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100 #endif
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101
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102
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103 /* We assume all modern POSIX systems have gettimeofday() */
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104 #ifdef GETTIMEOFDAY_NO_TZ
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105 #define GETTIMEOFDAY(ptv) gettimeofday(ptv)
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106 #else
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107 #define GETTIMEOFDAY(ptv) gettimeofday(ptv, (struct timezone *)NULL)
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108 #endif
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109
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110 #define MICROSECONDS_TO_TIMESPEC(microseconds, ts) \
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111 do { \
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112 struct timeval tv; \
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113 GETTIMEOFDAY(&tv); \
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114 tv.tv_usec += microseconds % 1000000; \
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115 tv.tv_sec += microseconds / 1000000; \
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116 tv.tv_sec += tv.tv_usec / 1000000; \
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117 tv.tv_usec %= 1000000; \
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118 ts.tv_sec = tv.tv_sec; \
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119 ts.tv_nsec = tv.tv_usec * 1000; \
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120 } while(0)
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121
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122
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123 /* A pthread mutex isn't sufficient to model the Python lock type
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124 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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125 * following are undefined:
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126 * -> a thread tries to lock a mutex it already has locked
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127 * -> a thread tries to unlock a mutex locked by a different thread
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128 * pthread mutexes are designed for serializing threads over short pieces
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129 * of code anyway, so wouldn't be an appropriate implementation of
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130 * Python's locks regardless.
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131 *
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132 * The pthread_lock struct implements a Python lock as a "locked?" bit
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133 * and a <condition, mutex> pair. In general, if the bit can be acquired
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134 * instantly, it is, else the pair is used to block the thread until the
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135 * bit is cleared. 9 May 1994 tim@ksr.com
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136 */
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137
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138 typedef struct {
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139 char locked; /* 0=unlocked, 1=locked */
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140 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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141 pthread_cond_t lock_released;
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142 pthread_mutex_t mut;
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143 } pthread_lock;
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144
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145 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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146
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147 /*
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148 * Initialization.
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149 */
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150
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151 #ifdef _HAVE_BSDI
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152 static
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153 void _noop(void)
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154 {
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155 }
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156
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157 static void
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158 PyThread__init_thread(void)
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159 {
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160 /* DO AN INIT BY STARTING THE THREAD */
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161 static int dummy = 0;
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162 pthread_t thread1;
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163 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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164 pthread_join(thread1, NULL);
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165 }
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166
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167 #else /* !_HAVE_BSDI */
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168
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169 static void
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170 PyThread__init_thread(void)
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171 {
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172 #if defined(_AIX) && defined(__GNUC__)
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173 pthread_init();
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174 #endif
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175 }
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176
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177 #endif /* !_HAVE_BSDI */
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178
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179 /*
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180 * Thread support.
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181 */
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182
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183
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184 long
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185 PyThread_start_new_thread(void (*func)(void *), void *arg)
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186 {
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187 pthread_t th;
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188 int status;
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189 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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190 pthread_attr_t attrs;
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191 #endif
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192 #if defined(THREAD_STACK_SIZE)
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193 size_t tss;
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194 #endif
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195
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196 dprintf(("PyThread_start_new_thread called\n"));
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197 if (!initialized)
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198 PyThread_init_thread();
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199
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200 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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201 if (pthread_attr_init(&attrs) != 0)
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202 return -1;
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203 #endif
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204 #if defined(THREAD_STACK_SIZE)
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205 tss = (_pythread_stacksize != 0) ? _pythread_stacksize
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206 : THREAD_STACK_SIZE;
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207 if (tss != 0) {
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208 if (pthread_attr_setstacksize(&attrs, tss) != 0) {
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209 pthread_attr_destroy(&attrs);
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210 return -1;
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211 }
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212 }
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213 #endif
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214 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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215 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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216 #endif
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217
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218 status = pthread_create(&th,
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219 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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220 &attrs,
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221 #else
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222 (pthread_attr_t*)NULL,
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223 #endif
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224 (void* (*)(void *))func,
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225 (void *)arg
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226 );
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227
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228 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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229 pthread_attr_destroy(&attrs);
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230 #endif
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231 if (status != 0)
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232 return -1;
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233
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234 pthread_detach(th);
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235
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236 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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237 return (long) th;
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238 #else
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239 return (long) *(long *) &th;
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240 #endif
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241 }
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242
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243 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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244 hosed" because:
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245 - It does not guarantee the promise that a non-zero integer is returned.
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246 - The cast to long is inherently unsafe.
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247 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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248 latter return statement (for Alpha OSF/1) are any longer necessary.
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249 */
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250 long
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251 PyThread_get_thread_ident(void)
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252 {
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253 volatile pthread_t threadid;
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254 if (!initialized)
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255 PyThread_init_thread();
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256 /* Jump through some hoops for Alpha OSF/1 */
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257 threadid = pthread_self();
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258 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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259 return (long) threadid;
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260 #else
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261 return (long) *(long *) &threadid;
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262 #endif
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263 }
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264
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265 void
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266 PyThread_exit_thread(void)
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267 {
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268 dprintf(("PyThread_exit_thread called\n"));
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269 if (!initialized)
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270 exit(0);
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271 pthread_exit(0);
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272 }
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273
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274 #ifdef USE_SEMAPHORES
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275
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276 /*
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277 * Lock support.
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278 */
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279
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280 PyThread_type_lock
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281 PyThread_allocate_lock(void)
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282 {
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283 sem_t *lock;
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284 int status, error = 0;
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285
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286 dprintf(("PyThread_allocate_lock called\n"));
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287 if (!initialized)
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288 PyThread_init_thread();
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289
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290 lock = (sem_t *)malloc(sizeof(sem_t));
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291
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292 if (lock) {
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293 status = sem_init(lock,0,1);
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294 CHECK_STATUS("sem_init");
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295
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296 if (error) {
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297 free((void *)lock);
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298 lock = NULL;
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299 }
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300 }
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301
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302 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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303 return (PyThread_type_lock)lock;
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304 }
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305
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306 void
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307 PyThread_free_lock(PyThread_type_lock lock)
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308 {
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309 sem_t *thelock = (sem_t *)lock;
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310 int status, error = 0;
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311
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312 (void) error; /* silence unused-but-set-variable warning */
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313 dprintf(("PyThread_free_lock(%p) called\n", lock));
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314
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315 if (!thelock)
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316 return;
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317
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318 status = sem_destroy(thelock);
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319 CHECK_STATUS("sem_destroy");
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320
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321 free((void *)thelock);
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322 }
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323
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324 /*
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325 * As of February 2002, Cygwin thread implementations mistakenly report error
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326 * codes in the return value of the sem_ calls (like the pthread_ functions).
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327 * Correct implementations return -1 and put the code in errno. This supports
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328 * either.
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329 */
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330 static int
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331 fix_status(int status)
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332 {
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333 return (status == -1) ? errno : status;
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334 }
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335
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336 PyLockStatus
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337 PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,
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338 int intr_flag)
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339 {
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340 PyLockStatus success;
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341 sem_t *thelock = (sem_t *)lock;
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342 int status, error = 0;
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343 struct timespec ts;
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344
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345 (void) error; /* silence unused-but-set-variable warning */
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346 dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) called\n",
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347 lock, microseconds, intr_flag));
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348
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349 if (microseconds > 0)
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350 MICROSECONDS_TO_TIMESPEC(microseconds, ts);
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351 do {
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352 if (microseconds > 0)
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353 status = fix_status(sem_timedwait(thelock, &ts));
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354 else if (microseconds == 0)
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355 status = fix_status(sem_trywait(thelock));
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356 else
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357 status = fix_status(sem_wait(thelock));
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358 /* Retry if interrupted by a signal, unless the caller wants to be
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359 notified. */
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360 } while (!intr_flag && status == EINTR);
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361
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362 /* Don't check the status if we're stopping because of an interrupt. */
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363 if (!(intr_flag && status == EINTR)) {
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364 if (microseconds > 0) {
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365 if (status != ETIMEDOUT)
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366 CHECK_STATUS("sem_timedwait");
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367 }
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368 else if (microseconds == 0) {
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369 if (status != EAGAIN)
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370 CHECK_STATUS("sem_trywait");
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371 }
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372 else {
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373 CHECK_STATUS("sem_wait");
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374 }
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375 }
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376
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377 if (status == 0) {
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378 success = PY_LOCK_ACQUIRED;
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379 } else if (intr_flag && status == EINTR) {
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380 success = PY_LOCK_INTR;
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381 } else {
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382 success = PY_LOCK_FAILURE;
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383 }
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384
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385 dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) -> %d\n",
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386 lock, microseconds, intr_flag, success));
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387 return success;
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388 }
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389
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390 void
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391 PyThread_release_lock(PyThread_type_lock lock)
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392 {
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393 sem_t *thelock = (sem_t *)lock;
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394 int status, error = 0;
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395
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396 (void) error; /* silence unused-but-set-variable warning */
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397 dprintf(("PyThread_release_lock(%p) called\n", lock));
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398
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399 status = sem_post(thelock);
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400 CHECK_STATUS("sem_post");
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401 }
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402
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403 #else /* USE_SEMAPHORES */
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404
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405 /*
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406 * Lock support.
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407 */
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408 PyThread_type_lock
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409 PyThread_allocate_lock(void)
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410 {
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411 pthread_lock *lock;
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412 int status, error = 0;
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413
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414 dprintf(("PyThread_allocate_lock called\n"));
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415 if (!initialized)
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416 PyThread_init_thread();
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417
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418 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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419 if (lock) {
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420 memset((void *)lock, '\0', sizeof(pthread_lock));
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421 lock->locked = 0;
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422
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423 status = pthread_mutex_init(&lock->mut,
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424 pthread_mutexattr_default);
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425 CHECK_STATUS("pthread_mutex_init");
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426 /* Mark the pthread mutex underlying a Python mutex as
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427 pure happens-before. We can't simply mark the
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428 Python-level mutex as a mutex because it can be
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429 acquired and released in different threads, which
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430 will cause errors. */
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431 _Py_ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX(&lock->mut);
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432
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433 status = pthread_cond_init(&lock->lock_released,
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434 pthread_condattr_default);
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435 CHECK_STATUS("pthread_cond_init");
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436
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437 if (error) {
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438 free((void *)lock);
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439 lock = 0;
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440 }
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441 }
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442
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443 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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444 return (PyThread_type_lock) lock;
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445 }
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446
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447 void
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448 PyThread_free_lock(PyThread_type_lock lock)
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449 {
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450 pthread_lock *thelock = (pthread_lock *)lock;
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451 int status, error = 0;
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452
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453 dprintf(("PyThread_free_lock(%p) called\n", lock));
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454
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455 status = pthread_mutex_destroy( &thelock->mut );
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456 CHECK_STATUS("pthread_mutex_destroy");
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457
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458 status = pthread_cond_destroy( &thelock->lock_released );
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459 CHECK_STATUS("pthread_cond_destroy");
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460
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461 free((void *)thelock);
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462 }
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463
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464 PyLockStatus
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465 PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,
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466 int intr_flag)
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467 {
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468 PyLockStatus success;
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469 pthread_lock *thelock = (pthread_lock *)lock;
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470 int status, error = 0;
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471
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472 dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) called\n",
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473 lock, microseconds, intr_flag));
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474
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475 status = pthread_mutex_lock( &thelock->mut );
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476 CHECK_STATUS("pthread_mutex_lock[1]");
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477
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478 if (thelock->locked == 0) {
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479 success = PY_LOCK_ACQUIRED;
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480 } else if (microseconds == 0) {
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481 success = PY_LOCK_FAILURE;
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482 } else {
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483 struct timespec ts;
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484 if (microseconds > 0)
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485 MICROSECONDS_TO_TIMESPEC(microseconds, ts);
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486 /* continue trying until we get the lock */
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487
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488 /* mut must be locked by me -- part of the condition
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489 * protocol */
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490 success = PY_LOCK_FAILURE;
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491 while (success == PY_LOCK_FAILURE) {
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492 if (microseconds > 0) {
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493 status = pthread_cond_timedwait(
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494 &thelock->lock_released,
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495 &thelock->mut, &ts);
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496 if (status == ETIMEDOUT)
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497 break;
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498 CHECK_STATUS("pthread_cond_timed_wait");
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499 }
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500 else {
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501 status = pthread_cond_wait(
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502 &thelock->lock_released,
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503 &thelock->mut);
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504 CHECK_STATUS("pthread_cond_wait");
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505 }
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506
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507 if (intr_flag && status == 0 && thelock->locked) {
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508 /* We were woken up, but didn't get the lock. We probably received
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509 * a signal. Return PY_LOCK_INTR to allow the caller to handle
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510 * it and retry. */
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511 success = PY_LOCK_INTR;
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512 break;
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513 } else if (status == 0 && !thelock->locked) {
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514 success = PY_LOCK_ACQUIRED;
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515 } else {
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516 success = PY_LOCK_FAILURE;
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517 }
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518 }
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519 }
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520 if (success == PY_LOCK_ACQUIRED) thelock->locked = 1;
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521 status = pthread_mutex_unlock( &thelock->mut );
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522 CHECK_STATUS("pthread_mutex_unlock[1]");
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523
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524 if (error) success = PY_LOCK_FAILURE;
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525 dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) -> %d\n",
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526 lock, microseconds, intr_flag, success));
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527 return success;
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528 }
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529
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530 void
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531 PyThread_release_lock(PyThread_type_lock lock)
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532 {
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533 pthread_lock *thelock = (pthread_lock *)lock;
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534 int status, error = 0;
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535
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536 dprintf(("PyThread_release_lock(%p) called\n", lock));
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537
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538 status = pthread_mutex_lock( &thelock->mut );
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539 CHECK_STATUS("pthread_mutex_lock[3]");
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540
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541 thelock->locked = 0;
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542
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543 status = pthread_mutex_unlock( &thelock->mut );
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544 CHECK_STATUS("pthread_mutex_unlock[3]");
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diff changeset
545
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546 /* wake up someone (anyone, if any) waiting on the lock */
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547 status = pthread_cond_signal( &thelock->lock_released );
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548 CHECK_STATUS("pthread_cond_signal");
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diff changeset
549 }
22339
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Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
550
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parents: 21766
diff changeset
551 #endif /* USE_SEMAPHORES */
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552
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553 int
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554 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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555 {
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556 return PyThread_acquire_lock_timed(lock, waitflag ? -1 : 0, /*intr_flag=*/0);
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557 }
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558
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559 /* set the thread stack size.
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560 * Return 0 if size is valid, -1 if size is invalid,
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561 * -2 if setting stack size is not supported.
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562 */
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563 static int
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564 _pythread_pthread_set_stacksize(size_t size)
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565 {
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566 #if defined(THREAD_STACK_SIZE)
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567 pthread_attr_t attrs;
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568 size_t tss_min;
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569 int rc = 0;
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570 #endif
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571
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572 /* set to default */
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573 if (size == 0) {
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574 _pythread_stacksize = 0;
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575 return 0;
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576 }
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577
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578 #if defined(THREAD_STACK_SIZE)
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579 #if defined(PTHREAD_STACK_MIN)
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580 tss_min = PTHREAD_STACK_MIN > THREAD_STACK_MIN ? PTHREAD_STACK_MIN
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581 : THREAD_STACK_MIN;
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582 #else
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583 tss_min = THREAD_STACK_MIN;
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584 #endif
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585 if (size >= tss_min) {
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586 /* validate stack size by setting thread attribute */
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587 if (pthread_attr_init(&attrs) == 0) {
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588 rc = pthread_attr_setstacksize(&attrs, size);
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589 pthread_attr_destroy(&attrs);
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590 if (rc == 0) {
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591 _pythread_stacksize = size;
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592 return 0;
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593 }
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594 }
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595 }
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596 return -1;
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597 #else
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598 return -2;
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599 #endif
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600 }
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601
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602 #define THREAD_SET_STACKSIZE(x) _pythread_pthread_set_stacksize(x)
64844
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603
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604 #define Py_HAVE_NATIVE_TLS
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605
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606 int
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607 PyThread_create_key(void)
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608 {
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609 pthread_key_t key;
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610 int fail = pthread_key_create(&key, NULL);
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611 return fail ? -1 : key;
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612 }
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613
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614 void
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615 PyThread_delete_key(int key)
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616 {
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617 pthread_key_delete(key);
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618 }
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619
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620 void
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621 PyThread_delete_key_value(int key)
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622 {
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623 pthread_setspecific(key, NULL);
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624 }
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625
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626 int
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627 PyThread_set_key_value(int key, void *value)
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628 {
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629 int fail;
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630 void *oldValue = pthread_getspecific(key);
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631 if (oldValue != NULL)
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632 return 0;
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633 fail = pthread_setspecific(key, value);
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634 return fail ? -1 : 0;
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635 }
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636
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
637 void *
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
638 PyThread_get_key_value(int key)
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
639 {
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
640 return pthread_getspecific(key);
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
641 }
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
642
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
643 void
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
644 PyThread_ReInitTLS(void)
8e428b8e7d81 issue 9786 Native TLS support for pthreads
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 61466
diff changeset
645 {}