Mercurial > cpython-lru_cache-weakref

annotate Python/pytime.c @ 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 0e46e0cd368f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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20
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21 static void
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22 pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info)
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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 if (info) {
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39 DWORD timeAdjustment, timeIncrement;
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40 BOOL isTimeAdjustmentDisabled;
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41
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42 info->implementation = "GetSystemTimeAsFileTime()";
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43 info->monotonic = 0;
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44 (void) GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
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45 &isTimeAdjustmentDisabled);
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46 info->resolution = timeIncrement * 1e-7;
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47 info->adjustable = 1;
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48 }
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49 #else
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50 /* There are three ways to get the time:
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51 (1) gettimeofday() -- resolution in microseconds
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52 (2) ftime() -- resolution in milliseconds
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53 (3) time() -- resolution in seconds
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54 In all cases the return value in a timeval struct.
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55 Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
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56 fail, so we fall back on ftime() or time().
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57 Note: clock resolution does not imply clock accuracy! */
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58
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59 #ifdef HAVE_GETTIMEOFDAY
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60 int err;
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61 #ifdef GETTIMEOFDAY_NO_TZ
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62 err = gettimeofday(tp);
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63 #else
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64 err = gettimeofday(tp, (struct timezone *)NULL);
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65 #endif
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66 if (err == 0) {
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67 if (info) {
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68 info->implementation = "gettimeofday()";
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69 info->resolution = 1e-6;
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70 info->monotonic = 0;
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71 info->adjustable = 1;
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72 }
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73 return;
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74 }
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75 #endif /* HAVE_GETTIMEOFDAY */
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76
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77 #if defined(HAVE_FTIME)
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78 {
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79 struct timeb t;
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80 ftime(&t);
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81 tp->tv_sec = t.time;
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82 tp->tv_usec = t.millitm * 1000;
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83 if (info) {
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84 info->implementation = "ftime()";
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85 info->resolution = 1e-3;
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86 info->monotonic = 0;
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87 info->adjustable = 1;
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88 }
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89 }
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90 #else /* !HAVE_FTIME */
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91 tp->tv_sec = time(NULL);
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92 tp->tv_usec = 0;
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93 if (info) {
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94 info->implementation = "time()";
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95 info->resolution = 1.0;
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96 info->monotonic = 0;
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97 info->adjustable = 1;
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98 }
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99 #endif /* !HAVE_FTIME */
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100
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101 #endif /* MS_WINDOWS */
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102 }
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103
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104 void
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105 _PyTime_gettimeofday(_PyTime_timeval *tp)
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106 {
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107 pygettimeofday(tp, NULL);
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108 }
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109
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110 void
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111 _PyTime_gettimeofday_info(_PyTime_timeval *tp, _Py_clock_info_t *info)
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112 {
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113 pygettimeofday(tp, info);
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114 }
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115
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116 static void
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117 error_time_t_overflow(void)
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118 {
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119 PyErr_SetString(PyExc_OverflowError,
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120 "timestamp out of range for platform time_t");
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121 }
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122
76725
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123 time_t
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124 _PyLong_AsTime_t(PyObject *obj)
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125 {
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126 #if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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127 PY_LONG_LONG val;
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128 val = PyLong_AsLongLong(obj);
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129 #else
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130 long val;
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131 assert(sizeof(time_t) <= sizeof(long));
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132 val = PyLong_AsLong(obj);
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133 #endif
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134 if (val == -1 && PyErr_Occurred()) {
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135 if (PyErr_ExceptionMatches(PyExc_OverflowError))
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136 error_time_t_overflow();
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137 return -1;
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138 }
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139 return (time_t)val;
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140 }
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141
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142 PyObject *
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143 _PyLong_FromTime_t(time_t t)
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144 {
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145 #if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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146 return PyLong_FromLongLong((PY_LONG_LONG)t);
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147 #else
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148 assert(sizeof(time_t) <= sizeof(long));
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149 return PyLong_FromLong((long)t);
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150 #endif
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151 }
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152
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153 static int
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154 _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
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155 double denominator)
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156 {
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157 assert(denominator <= LONG_MAX);
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158 if (PyFloat_Check(obj)) {
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159 double d, intpart, err;
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160 /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
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161 volatile double floatpart;
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162
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163 d = PyFloat_AsDouble(obj);
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164 floatpart = modf(d, &intpart);
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165 if (floatpart < 0) {
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166 floatpart = 1.0 + floatpart;
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167 intpart -= 1.0;
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168 }
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169
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170 *sec = (time_t)intpart;
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171 err = intpart - (double)*sec;
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172 if (err <= -1.0 || err >= 1.0) {
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173 error_time_t_overflow();
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174 return -1;
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175 }
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176
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177 floatpart *= denominator;
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178 *numerator = (long)floatpart;
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179 return 0;
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180 }
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181 else {
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182 *sec = _PyLong_AsTime_t(obj);
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183 if (*sec == (time_t)-1 && PyErr_Occurred())
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184 return -1;
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185 *numerator = 0;
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186 return 0;
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187 }
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188 }
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189
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190 int
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191 _PyTime_ObjectToTime_t(PyObject *obj, time_t *sec)
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192 {
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193 if (PyFloat_Check(obj)) {
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194 double d, intpart, err;
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195
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196 d = PyFloat_AsDouble(obj);
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197 (void)modf(d, &intpart);
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198
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199 *sec = (time_t)intpart;
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200 err = intpart - (double)*sec;
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201 if (err <= -1.0 || err >= 1.0) {
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202 error_time_t_overflow();
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203 return -1;
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204 }
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205 return 0;
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206 }
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207 else {
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208 *sec = _PyLong_AsTime_t(obj);
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209 if (*sec == (time_t)-1 && PyErr_Occurred())
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210 return -1;
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211 return 0;
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212 }
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213 }
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214
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215 int
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216 _PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec)
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217 {
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218 return _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9);
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219 }
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diff changeset
220
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221 int
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222 _PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec)
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223 {
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224 return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6);
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225 }
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226
63757
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
227 void
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parents:
diff changeset
228 _PyTime_Init()
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parents:
diff changeset
229 {
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
230 /* Do nothing. Needed to force linking. */
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
231 }