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annotate Python/condvar.h @ 86301:500b4b62c19a

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Issue #19219 Remove a lot of "retval = NULL" statements, now that retval is pre-initialized to that value. Test show a 5% speedup as a bonus.
author Kristján Valur Jónsson <kristjan@ccpgames.com>
date Sun, 13 Oct 2013 13:41:59 +0000
parents c6af0b3de726
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_ */