Mercurial > cpython-lru_cache-weakref

annotate Python/condvar.h @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents c6af0b3de726
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Portable condition variable support for windows and pthreads.
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3 * Everything is inline, this header can be included where needed.
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4 *
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5 * APIs generally return 0 on success and non-zero on error,
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6 * and the caller needs to use its platform's error mechanism to
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7 * discover the error (errno, or GetLastError())
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8 *
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9 * Note that some implementations cannot distinguish between a
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10 * condition variable wait time-out and successful wait. Most often
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11 * the difference is moot anyway since the wait condition must be
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12 * re-checked.
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13 * PyCOND_TIMEDWAIT, in addition to returning negative on error,
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14 * thus returns 0 on regular success, 1 on timeout
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15 * or 2 if it can't tell.
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16 *
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17 * There are at least two caveats with using these condition variables,
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18 * due to the fact that they may be emulated with Semaphores on
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19 * Windows:
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20 * 1) While PyCOND_SIGNAL() will wake up at least one thread, we
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21 * cannot currently guarantee that it will be one of the threads
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22 * already waiting in a PyCOND_WAIT() call. It _could_ cause
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23 * the wakeup of a subsequent thread to try a PyCOND_WAIT(),
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24 * including the thread doing the PyCOND_SIGNAL() itself.
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25 * The same applies to PyCOND_BROADCAST(), if N threads are waiting
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26 * then at least N threads will be woken up, but not necessarily
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27 * those already waiting.
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28 * For this reason, don't make the scheduling assumption that a
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29 * specific other thread will get the wakeup signal
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30 * 2) The _mutex_ must be held when calling PyCOND_SIGNAL() and
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31 * PyCOND_BROADCAST().
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32 * While e.g. the posix standard strongly recommends that the mutex
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33 * associated with the condition variable is held when a
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34 * pthread_cond_signal() call is made, this is not a hard requirement,
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35 * although scheduling will not be "reliable" if it isn't. Here
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36 * the mutex is used for internal synchronization of the emulated
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37 * Condition Variable.
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38 */
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39
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40 #ifndef _CONDVAR_H_
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41 #define _CONDVAR_H_
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42
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43 #include "Python.h"
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44
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45 #ifndef _POSIX_THREADS
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46 /* This means pthreads are not implemented in libc headers, hence the macro
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47 not present in unistd.h. But they still can be implemented as an external
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48 library (e.g. gnu pth in pthread emulation) */
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49 # ifdef HAVE_PTHREAD_H
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50 # include <pthread.h> /* _POSIX_THREADS */
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51 # endif
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52 #endif
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53
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54 #ifdef _POSIX_THREADS
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55 /*
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56 * POSIX support
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57 */
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58 #define Py_HAVE_CONDVAR
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59
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60 #include <pthread.h>
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61
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62 #define PyCOND_ADD_MICROSECONDS(tv, interval) \
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63 do { \
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64 tv.tv_usec += (long) interval; \
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65 tv.tv_sec += tv.tv_usec / 1000000; \
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66 tv.tv_usec %= 1000000; \
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67 } while (0)
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68
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69 /* We assume all modern POSIX systems have gettimeofday() */
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70 #ifdef GETTIMEOFDAY_NO_TZ
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71 #define PyCOND_GETTIMEOFDAY(ptv) gettimeofday(ptv)
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72 #else
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73 #define PyCOND_GETTIMEOFDAY(ptv) gettimeofday(ptv, (struct timezone *)NULL)
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74 #endif
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75
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76 /* The following functions return 0 on success, nonzero on error */
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77 #define PyMUTEX_T pthread_mutex_t
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78 #define PyMUTEX_INIT(mut) pthread_mutex_init((mut), NULL)
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79 #define PyMUTEX_FINI(mut) pthread_mutex_destroy(mut)
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80 #define PyMUTEX_LOCK(mut) pthread_mutex_lock(mut)
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81 #define PyMUTEX_UNLOCK(mut) pthread_mutex_unlock(mut)
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82
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83 #define PyCOND_T pthread_cond_t
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84 #define PyCOND_INIT(cond) pthread_cond_init((cond), NULL)
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85 #define PyCOND_FINI(cond) pthread_cond_destroy(cond)
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86 #define PyCOND_SIGNAL(cond) pthread_cond_signal(cond)
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87 #define PyCOND_BROADCAST(cond) pthread_cond_broadcast(cond)
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88 #define PyCOND_WAIT(cond, mut) pthread_cond_wait((cond), (mut))
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89
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90 /* return 0 for success, 1 on timeout, -1 on error */
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91 Py_LOCAL_INLINE(int)
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92 PyCOND_TIMEDWAIT(PyCOND_T *cond, PyMUTEX_T *mut, long us)
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93 {
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94 int r;
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95 struct timespec ts;
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96 struct timeval deadline;
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97
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98 PyCOND_GETTIMEOFDAY(&deadline);
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99 PyCOND_ADD_MICROSECONDS(deadline, us);
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100 ts.tv_sec = deadline.tv_sec;
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101 ts.tv_nsec = deadline.tv_usec * 1000;
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102
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103 r = pthread_cond_timedwait((cond), (mut), &ts);
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104 if (r == ETIMEDOUT)
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105 return 1;
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106 else if (r)
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107 return -1;
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108 else
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109 return 0;
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110 }
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111
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112 #elif defined(NT_THREADS)
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113 /*
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114 * Windows (XP, 2003 server and later, as well as (hopefully) CE) support
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115 *
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116 * Emulated condition variables ones that work with XP and later, plus
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117 * example native support on VISTA and onwards.
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118 */
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119 #define Py_HAVE_CONDVAR
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120
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121
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122 /* include windows if it hasn't been done before */
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123 #define WIN32_LEAN_AND_MEAN
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124 #include <windows.h>
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125
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126 /* options */
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127 /* non-emulated condition variables are provided for those that want
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128 * to target Windows Vista. Modify this macro to enable them.
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129 */
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130 #ifndef _PY_EMULATED_WIN_CV
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131 #define _PY_EMULATED_WIN_CV 1 /* use emulated condition variables */
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132 #endif
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133
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134 /* fall back to emulation if not targeting Vista */
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135 #if !defined NTDDI_VISTA || NTDDI_VERSION < NTDDI_VISTA
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136 #undef _PY_EMULATED_WIN_CV
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137 #define _PY_EMULATED_WIN_CV 1
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138 #endif
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139
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140
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141 #if _PY_EMULATED_WIN_CV
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142
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143 /* The mutex is a CriticalSection object and
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144 The condition variables is emulated with the help of a semaphore.
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145 Semaphores are available on Windows XP (2003 server) and later.
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146 We use a Semaphore rather than an auto-reset event, because although
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147 an auto-resent event might appear to solve the lost-wakeup bug (race
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148 condition between releasing the outer lock and waiting) because it
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149 maintains state even though a wait hasn't happened, there is still
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150 a lost wakeup problem if more than one thread are interrupted in the
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151 critical place. A semaphore solves that, because its state is counted,
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152 not Boolean.
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153 Because it is ok to signal a condition variable with no one
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154 waiting, we need to keep track of the number of
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155 waiting threads. Otherwise, the semaphore's state could rise
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156 without bound. This also helps reduce the number of "spurious wakeups"
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157 that would otherwise happen.
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158
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159 This implementation still has the problem that the threads woken
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160 with a "signal" aren't necessarily those that are already
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161 waiting. It corresponds to listing 2 in:
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162 http://birrell.org/andrew/papers/ImplementingCVs.pdf
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163
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164 Generic emulations of the pthread_cond_* API using
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165 earlier Win32 functions can be found on the Web.
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166 The following read can be give background information to these issues,
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167 but the implementations are all broken in some way.
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168 http://www.cse.wustl.edu/~schmidt/win32-cv-1.html
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169 */
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170
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171 typedef CRITICAL_SECTION PyMUTEX_T;
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172
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173 Py_LOCAL_INLINE(int)
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174 PyMUTEX_INIT(PyMUTEX_T *cs)
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175 {
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176 InitializeCriticalSection(cs);
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177 return 0;
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178 }
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179
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180 Py_LOCAL_INLINE(int)
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181 PyMUTEX_FINI(PyMUTEX_T *cs)
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182 {
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183 DeleteCriticalSection(cs);
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184 return 0;
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185 }
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186
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187 Py_LOCAL_INLINE(int)
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188 PyMUTEX_LOCK(PyMUTEX_T *cs)
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189 {
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190 EnterCriticalSection(cs);
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191 return 0;
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192 }
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193
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194 Py_LOCAL_INLINE(int)
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195 PyMUTEX_UNLOCK(PyMUTEX_T *cs)
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196 {
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197 LeaveCriticalSection(cs);
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198 return 0;
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199 }
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200
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201 /* The ConditionVariable object. From XP onwards it is easily emulated with
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202 * a Semaphore
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203 */
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204
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205 typedef struct _PyCOND_T
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206 {
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207 HANDLE sem;
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208 int waiting; /* to allow PyCOND_SIGNAL to be a no-op */
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209 } PyCOND_T;
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210
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211 Py_LOCAL_INLINE(int)
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212 PyCOND_INIT(PyCOND_T *cv)
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213 {
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214 /* A semaphore with a "large" max value, The positive value
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215 * is only needed to catch those "lost wakeup" events and
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216 * race conditions when a timed wait elapses.
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217 */
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218 cv->sem = CreateSemaphore(NULL, 0, 100000, NULL);
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219 if (cv->sem==NULL)
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220 return -1;
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221 cv->waiting = 0;
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222 return 0;
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223 }
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224
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225 Py_LOCAL_INLINE(int)
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226 PyCOND_FINI(PyCOND_T *cv)
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227 {
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228 return CloseHandle(cv->sem) ? 0 : -1;
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229 }
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230
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231 /* this implementation can detect a timeout. Returns 1 on timeout,
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232 * 0 otherwise (and -1 on error)
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233 */
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234 Py_LOCAL_INLINE(int)
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235 _PyCOND_WAIT_MS(PyCOND_T *cv, PyMUTEX_T *cs, DWORD ms)
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236 {
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237 DWORD wait;
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238 cv->waiting++;
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239 PyMUTEX_UNLOCK(cs);
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240 /* "lost wakeup bug" would occur if the caller were interrupted here,
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241 * but we are safe because we are using a semaphore wich has an internal
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242 * count.
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243 */
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244 wait = WaitForSingleObjectEx(cv->sem, ms, FALSE);
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245 PyMUTEX_LOCK(cs);
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246 if (wait != WAIT_OBJECT_0)
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247 --cv->waiting;
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248 /* Here we have a benign race condition with PyCOND_SIGNAL.
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249 * When failure occurs or timeout, it is possible that
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250 * PyCOND_SIGNAL also decrements this value
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251 * and signals releases the mutex. This is benign because it
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252 * just means an extra spurious wakeup for a waiting thread.
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253 * ('waiting' corresponds to the semaphore's "negative" count and
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254 * we may end up with e.g. (waiting == -1 && sem.count == 1). When
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255 * a new thread comes along, it will pass right throuhgh, having
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256 * adjusted it to (waiting == 0 && sem.count == 0).
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257 */
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258
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259 if (wait == WAIT_FAILED)
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260 return -1;
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261 /* return 0 on success, 1 on timeout */
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262 return wait != WAIT_OBJECT_0;
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263 }
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264
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265 Py_LOCAL_INLINE(int)
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266 PyCOND_WAIT(PyCOND_T *cv, PyMUTEX_T *cs)
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267 {
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268 int result = _PyCOND_WAIT_MS(cv, cs, INFINITE);
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269 return result >= 0 ? 0 : result;
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270 }
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271
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272 Py_LOCAL_INLINE(int)
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273 PyCOND_TIMEDWAIT(PyCOND_T *cv, PyMUTEX_T *cs, long us)
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274 {
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275 return _PyCOND_WAIT_MS(cv, cs, us/1000);
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276 }
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277
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278 Py_LOCAL_INLINE(int)
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279 PyCOND_SIGNAL(PyCOND_T *cv)
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280 {
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281 /* this test allows PyCOND_SIGNAL to be a no-op unless required
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282 * to wake someone up, thus preventing an unbounded increase of
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283 * the semaphore's internal counter.
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284 */
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285 if (cv->waiting > 0) {
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286 /* notifying thread decreases the cv->waiting count so that
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287 * a delay between notify and actual wakeup of the target thread
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288 * doesn't cause a number of extra ReleaseSemaphore calls.
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289 */
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290 cv->waiting--;
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291 return ReleaseSemaphore(cv->sem, 1, NULL) ? 0 : -1;
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292 }
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293 return 0;
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294 }
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295
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296 Py_LOCAL_INLINE(int)
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297 PyCOND_BROADCAST(PyCOND_T *cv)
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298 {
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299 int waiting = cv->waiting;
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300 if (waiting > 0) {
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301 cv->waiting = 0;
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302 return ReleaseSemaphore(cv->sem, waiting, NULL) ? 0 : -1;
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303 }
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304 return 0;
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305 }
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306
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307 #else
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308
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309 /* Use native Win7 primitives if build target is Win7 or higher */
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310
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311 /* SRWLOCK is faster and better than CriticalSection */
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312 typedef SRWLOCK PyMUTEX_T;
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313
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314 Py_LOCAL_INLINE(int)
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315 PyMUTEX_INIT(PyMUTEX_T *cs)
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316 {
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317 InitializeSRWLock(cs);
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318 return 0;
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319 }
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320
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321 Py_LOCAL_INLINE(int)
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322 PyMUTEX_FINI(PyMUTEX_T *cs)
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323 {
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324 return 0;
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325 }
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326
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327 Py_LOCAL_INLINE(int)
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328 PyMUTEX_LOCK(PyMUTEX_T *cs)
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329 {
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330 AcquireSRWLockExclusive(cs);
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331 return 0;
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332 }
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333
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334 Py_LOCAL_INLINE(int)
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335 PyMUTEX_UNLOCK(PyMUTEX_T *cs)
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336 {
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337 ReleaseSRWLockExclusive(cs);
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338 return 0;
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339 }
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340
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341
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342 typedef CONDITION_VARIABLE PyCOND_T;
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343
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344 Py_LOCAL_INLINE(int)
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345 PyCOND_INIT(PyCOND_T *cv)
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346 {
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347 InitializeConditionVariable(cv);
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348 return 0;
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349 }
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350 Py_LOCAL_INLINE(int)
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351 PyCOND_FINI(PyCOND_T *cv)
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352 {
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353 return 0;
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354 }
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355
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356 Py_LOCAL_INLINE(int)
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357 PyCOND_WAIT(PyCOND_T *cv, PyMUTEX_T *cs)
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358 {
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359 return SleepConditionVariableSRW(cv, cs, INFINITE, 0) ? 0 : -1;
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360 }
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361
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362 /* This implementation makes no distinction about timeouts. Signal
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363 * 2 to indicate that we don't know.
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364 */
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365 Py_LOCAL_INLINE(int)
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366 PyCOND_TIMEDWAIT(PyCOND_T *cv, PyMUTEX_T *cs, long us)
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367 {
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368 return SleepConditionVariableSRW(cv, cs, us/1000, 0) ? 2 : -1;
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369 }
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370
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371 Py_LOCAL_INLINE(int)
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372 PyCOND_SIGNAL(PyCOND_T *cv)
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373 {
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374 WakeConditionVariable(cv);
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375 return 0;
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376 }
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377
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378 Py_LOCAL_INLINE(int)
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379 PyCOND_BROADCAST(PyCOND_T *cv)
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380 {
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381 WakeAllConditionVariable(cv);
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382 return 0;
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383 }
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384
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385
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386 #endif /* _PY_EMULATED_WIN_CV */
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387
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388 #endif /* _POSIX_THREADS, NT_THREADS */
978326f98316 Issue #15038: Optimize python Locks on Windows
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents:
diff changeset
389
978326f98316 Issue #15038: Optimize python Locks on Windows
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents:
diff changeset
390 #endif /* _CONDVAR_H_ */