Jon Lund Steffensen
8b0a67a253
usleep() cannot sleep for more than 1000000 microseconds on certain platforms. nanosleep() does not have this limitation.
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/* systemtime.c -- Portable system time source
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This file is part of Redshift.
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Redshift is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Redshift is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Redshift. If not, see <http://www.gnu.org/licenses/>.
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Copyright (c) 2010-2014 Jon Lund Steffensen <jonlst@gmail.com>
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*/
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#include <stdio.h>
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#include <unistd.h>
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#ifndef _WIN32
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# if _POSIX_TIMERS > 0
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# include <time.h>
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# else
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# include <time.h>
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# include <sys/time.h>
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# endif
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#else
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# include <windows.h>
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#endif
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#include "systemtime.h"
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/* Return current time in T as the number of seconds since the epoch. */
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int
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systemtime_get_time(double *t)
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{
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#if defined(_WIN32) /* Windows */
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FILETIME now;
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ULARGE_INTEGER i;
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GetSystemTimeAsFileTime(&now);
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i.LowPart = now.dwLowDateTime;
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i.HighPart = now.dwHighDateTime;
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/* FILETIME is tenths of microseconds since 1601-01-01 UTC */
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*t = (i.QuadPart / 10000000.0) - 11644473600.0;
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#elif _POSIX_TIMERS > 0 /* POSIX timers */
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struct timespec now;
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int r = clock_gettime(CLOCK_REALTIME, &now);
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if (r < 0) {
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perror("clock_gettime");
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return -1;
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}
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*t = now.tv_sec + (now.tv_nsec / 1000000000.0);
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#else /* other platforms */
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struct timeval now;
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int r = gettimeofday(&now, NULL);
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if (r < 0) {
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perror("gettimeofday");
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return -1;
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}
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*t = now.tv_sec + (now.tv_usec / 1000000.0);
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#endif
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return 0;
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}
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/* Sleep for a number of milliseconds. */
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void
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systemtime_msleep(unsigned int msecs)
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{
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#ifndef _WIN32
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struct timespec sleep;
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sleep.tv_sec = msecs / 1000;
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sleep.tv_nsec = (msecs % 1000)*1000000;
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nanosleep(&sleep, NULL);
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#else
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Sleep(msecs);
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#endif
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}
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