Mercurial > cpython-lru_cache-weakref

annotate Python/pytime.c @ 76451:ea46ebba8a0f

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Issue #13959: Re-implement imp.source_from_cache() in Lib/imp.py.
author Brett Cannon <brett@python.org>
date Sat, 21 Apr 2012 18:52:52 -0400
parents f554043badec
children 76d2e0761d18
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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2 #ifdef MS_WINDOWS
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3 #include <windows.h>
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4 #endif
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5
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6 #if defined(__APPLE__) && defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
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7 /*
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8 * _PyTime_gettimeofday falls back to ftime when getttimeofday fails because the latter
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9 * might fail on some platforms. This fallback is unwanted on MacOSX because
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10 * that makes it impossible to use a binary build on OSX 10.4 on earlier
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11 * releases of the OS. Therefore claim we don't support ftime.
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12 */
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13 # undef HAVE_FTIME
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14 #endif
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15
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16 #if defined(HAVE_FTIME) && !defined(MS_WINDOWS)
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17 #include <sys/timeb.h>
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18 extern int ftime(struct timeb *);
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19 #endif
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21 void
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22 _PyTime_gettimeofday(_PyTime_timeval *tp)
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23 {
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24 #ifdef MS_WINDOWS
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25 FILETIME system_time;
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26 ULARGE_INTEGER large;
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27 ULONGLONG microseconds;
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28
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29 GetSystemTimeAsFileTime(&system_time);
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30 large.u.LowPart = system_time.dwLowDateTime;
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31 large.u.HighPart = system_time.dwHighDateTime;
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32 /* 11,644,473,600,000,000: number of microseconds between
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33 the 1st january 1601 and the 1st january 1970 (369 years + 89 leap
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34 days). */
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35 microseconds = large.QuadPart / 10 - 11644473600000000;
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36 tp->tv_sec = microseconds / 1000000;
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37 tp->tv_usec = microseconds % 1000000;
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38 #else
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39 /* There are three ways to get the time:
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40 (1) gettimeofday() -- resolution in microseconds
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41 (2) ftime() -- resolution in milliseconds
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42 (3) time() -- resolution in seconds
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43 In all cases the return value in a timeval struct.
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44 Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
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45 fail, so we fall back on ftime() or time().
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46 Note: clock resolution does not imply clock accuracy! */
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47
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48 #ifdef HAVE_GETTIMEOFDAY
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49 #ifdef GETTIMEOFDAY_NO_TZ
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50 if (gettimeofday(tp) == 0)
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51 return;
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52 #else /* !GETTIMEOFDAY_NO_TZ */
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53 if (gettimeofday(tp, (struct timezone *)NULL) == 0)
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54 return;
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55 #endif /* !GETTIMEOFDAY_NO_TZ */
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56 #endif /* !HAVE_GETTIMEOFDAY */
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57
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58 #if defined(HAVE_FTIME)
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59 {
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60 struct timeb t;
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61 ftime(&t);
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62 tp->tv_sec = t.time;
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63 tp->tv_usec = t.millitm * 1000;
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64 }
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65 #else /* !HAVE_FTIME */
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66 tp->tv_sec = time(NULL);
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67 tp->tv_usec = 0;
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68 #endif /* !HAVE_FTIME */
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69
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70 #endif /* MS_WINDOWS */
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71 }
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72
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73 static void
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74 error_time_t_overflow(void)
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75 {
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76 PyErr_SetString(PyExc_OverflowError,
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77 "timestamp out of range for platform time_t");
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78 }
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79
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80 static time_t
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81 _PyLong_AsTime_t(PyObject *obj)
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82 {
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83 #if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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84 PY_LONG_LONG val;
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85 val = PyLong_AsLongLong(obj);
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86 #else
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87 long val;
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88 assert(sizeof(time_t) <= sizeof(long));
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89 val = PyLong_AsLong(obj);
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90 #endif
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91 if (val == -1 && PyErr_Occurred()) {
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92 if (PyErr_ExceptionMatches(PyExc_OverflowError))
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93 error_time_t_overflow();
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94 return -1;
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95 }
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96 return (time_t)val;
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97 }
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98
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99 PyObject *
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100 _PyLong_FromTime_t(time_t t)
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101 {
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102 #if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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103 return PyLong_FromLongLong((PY_LONG_LONG)t);
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104 #else
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105 assert(sizeof(time_t) <= sizeof(long));
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106 return PyLong_FromLong((long)t);
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107 #endif
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108 }
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109
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110 static int
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111 _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
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112 double denominator)
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113 {
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114 assert(denominator <= LONG_MAX);
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115 if (PyFloat_Check(obj)) {
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116 double d, intpart, err;
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117 /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
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118 volatile double floatpart;
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119
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120 d = PyFloat_AsDouble(obj);
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121 floatpart = modf(d, &intpart);
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122 if (floatpart < 0) {
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123 floatpart = 1.0 + floatpart;
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124 intpart -= 1.0;
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125 }
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126
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127 *sec = (time_t)intpart;
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128 err = intpart - (double)*sec;
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129 if (err <= -1.0 || err >= 1.0) {
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130 error_time_t_overflow();
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131 return -1;
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132 }
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133
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134 floatpart *= denominator;
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135 *numerator = (long)floatpart;
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136 return 0;
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137 }
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138 else {
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139 *sec = _PyLong_AsTime_t(obj);
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140 if (*sec == (time_t)-1 && PyErr_Occurred())
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141 return -1;
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142 *numerator = 0;
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143 return 0;
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144 }
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145 }
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146
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147 int
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148 _PyTime_ObjectToTime_t(PyObject *obj, time_t *sec)
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149 {
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150 if (PyFloat_Check(obj)) {
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151 double d, intpart, err;
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152
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153 d = PyFloat_AsDouble(obj);
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154 (void)modf(d, &intpart);
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155
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156 *sec = (time_t)intpart;
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157 err = intpart - (double)*sec;
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158 if (err <= -1.0 || err >= 1.0) {
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159 error_time_t_overflow();
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160 return -1;
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161 }
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162 return 0;
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163 }
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164 else {
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165 *sec = _PyLong_AsTime_t(obj);
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166 if (*sec == (time_t)-1 && PyErr_Occurred())
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167 return -1;
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168 return 0;
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169 }
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170 }
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171
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172 int
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173 _PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec)
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174 {
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175 return _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9);
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176 }
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177
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178 int
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179 _PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec)
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180 {
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181 return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6);
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182 }
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183
63757
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
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184 void
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185 _PyTime_Init()
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186 {
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parents:
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187 /* Do nothing. Needed to force linking. */
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Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
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188 }