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annotate Python/pytime.c @ 76597:76d2e0761d18

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Issue #14428, #14397: Implement the PEP 418 * Rename time.steady() to time.monotonic() * On Windows, time.monotonic() uses GetTickCount/GetTickCount64() instead of QueryPerformanceCounter() * time.monotonic() uses CLOCK_HIGHRES if available * Add time.get_clock_info(), time.perf_counter() and time.process_time() functions
author Victor Stinner <victor.stinner@gmail.com>
date Sun, 29 Apr 2012 02:41:27 +0200
parents f554043badec
children 47c84e3f08ae
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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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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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->is_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 if (isTimeAdjustmentDisabled)
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48 info->is_adjusted = 0;
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49 else
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50 info->is_adjusted = 1;
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51 }
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52 #else
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53 /* There are three ways to get the time:
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54 (1) gettimeofday() -- resolution in microseconds
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55 (2) ftime() -- resolution in milliseconds
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56 (3) time() -- resolution in seconds
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57 In all cases the return value in a timeval struct.
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58 Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
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59 fail, so we fall back on ftime() or time().
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60 Note: clock resolution does not imply clock accuracy! */
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61
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62 #ifdef HAVE_GETTIMEOFDAY
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63 int err;
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64 #ifdef GETTIMEOFDAY_NO_TZ
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65 err = gettimeofday(tp);
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66 #else
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67 err = gettimeofday(tp, (struct timezone *)NULL);
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68 #endif
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69 if (err == 0) {
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70 if (info) {
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71 info->implementation = "gettimeofday()";
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72 info->resolution = 1e-6;
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73 info->is_monotonic = 0;
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74 info->is_adjusted = 1;
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75 }
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76 return;
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77 }
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78 #endif /* HAVE_GETTIMEOFDAY */
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79
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80 #if defined(HAVE_FTIME)
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81 {
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82 struct timeb t;
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83 ftime(&t);
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84 tp->tv_sec = t.time;
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85 tp->tv_usec = t.millitm * 1000;
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86 if (info) {
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87 info->implementation = "ftime()";
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88 info->resolution = 1e-3;
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89 info->is_monotonic = 0;
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90 info->is_adjusted = 1;
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91 }
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92 }
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93 #else /* !HAVE_FTIME */
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94 tp->tv_sec = time(NULL);
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95 tp->tv_usec = 0;
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96 if (info) {
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97 info->implementation = "time()";
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98 info->resolution = 1.0;
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99 info->is_monotonic = 0;
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100 info->is_adjusted = 1;
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101 }
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102 #endif /* !HAVE_FTIME */
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103
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104 #endif /* MS_WINDOWS */
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105 }
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106
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107 void
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108 _PyTime_gettimeofday(_PyTime_timeval *tp)
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109 {
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110 pygettimeofday(tp, NULL);
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111 }
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112
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113 void
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114 _PyTime_gettimeofday_info(_PyTime_timeval *tp, _Py_clock_info_t *info)
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115 {
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116 pygettimeofday(tp, info);
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117 }
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118
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119 static void
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120 error_time_t_overflow(void)
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121 {
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122 PyErr_SetString(PyExc_OverflowError,
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123 "timestamp out of range for platform time_t");
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124 }
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125
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126 static time_t
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127 _PyLong_AsTime_t(PyObject *obj)
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128 {
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129 #if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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130 PY_LONG_LONG val;
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131 val = PyLong_AsLongLong(obj);
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132 #else
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133 long val;
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134 assert(sizeof(time_t) <= sizeof(long));
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135 val = PyLong_AsLong(obj);
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136 #endif
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137 if (val == -1 && PyErr_Occurred()) {
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138 if (PyErr_ExceptionMatches(PyExc_OverflowError))
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139 error_time_t_overflow();
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140 return -1;
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141 }
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142 return (time_t)val;
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143 }
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144
76423
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Larry Hastings <larry@hastings.org>
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145 PyObject *
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146 _PyLong_FromTime_t(time_t t)
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147 {
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148 #if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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149 return PyLong_FromLongLong((PY_LONG_LONG)t);
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150 #else
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151 assert(sizeof(time_t) <= sizeof(long));
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152 return PyLong_FromLong((long)t);
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153 #endif
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154 }
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155
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156 static int
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157 _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
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158 double denominator)
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159 {
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160 assert(denominator <= LONG_MAX);
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161 if (PyFloat_Check(obj)) {
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162 double d, intpart, err;
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163 /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
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164 volatile double floatpart;
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165
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166 d = PyFloat_AsDouble(obj);
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167 floatpart = modf(d, &intpart);
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168 if (floatpart < 0) {
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169 floatpart = 1.0 + floatpart;
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170 intpart -= 1.0;
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171 }
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172
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173 *sec = (time_t)intpart;
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174 err = intpart - (double)*sec;
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175 if (err <= -1.0 || err >= 1.0) {
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176 error_time_t_overflow();
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177 return -1;
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178 }
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179
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180 floatpart *= denominator;
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181 *numerator = (long)floatpart;
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182 return 0;
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183 }
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184 else {
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185 *sec = _PyLong_AsTime_t(obj);
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186 if (*sec == (time_t)-1 && PyErr_Occurred())
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187 return -1;
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188 *numerator = 0;
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189 return 0;
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190 }
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191 }
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192
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193 int
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194 _PyTime_ObjectToTime_t(PyObject *obj, time_t *sec)
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195 {
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196 if (PyFloat_Check(obj)) {
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197 double d, intpart, err;
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198
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199 d = PyFloat_AsDouble(obj);
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200 (void)modf(d, &intpart);
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201
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202 *sec = (time_t)intpart;
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203 err = intpart - (double)*sec;
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204 if (err <= -1.0 || err >= 1.0) {
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205 error_time_t_overflow();
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206 return -1;
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207 }
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208 return 0;
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209 }
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210 else {
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211 *sec = _PyLong_AsTime_t(obj);
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212 if (*sec == (time_t)-1 && PyErr_Occurred())
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213 return -1;
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214 return 0;
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215 }
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216 }
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diff changeset
217
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218 int
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219 _PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec)
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220 {
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221 return _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9);
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222 }
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diff changeset
223
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diff changeset
224 int
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225 _PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec)
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226 {
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227 return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6);
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228 }
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229
63757
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
230 void
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
231 _PyTime_Init()
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
232 {
c16803bbd790 Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents:
diff changeset
233 /* 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
234 }