mirror of https://code.videolan.org/videolan/vlc
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/*****************************************************************************
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* clock_nanosleep.c: POSIX clock_nanosleep() replacement
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*****************************************************************************
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* Copyright © 2020 VLC authors and VideoLAN
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*
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* Author: Marvin Scholz <epirat07 at gmail dot com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef _WIN32
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <pthread.h>
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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# ifdef __APPLE__
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#include <mach/clock_types.h>
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# endif
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int clock_nanosleep(clockid_t clock_id, int flags,
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const struct timespec *rqtp, struct timespec *rmtp)
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{
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// Validate timespec
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if (rqtp == NULL || rqtp->tv_sec < 0 ||
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rqtp->tv_nsec < 0 || (unsigned long)rqtp->tv_nsec >= 1000*1000*1000) {
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errno = EINVAL;
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return -1;
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}
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// Validate clock
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switch (clock_id) {
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case CLOCK_MONOTONIC:
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case CLOCK_REALTIME:
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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if (flags == TIMER_ABSTIME) {
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struct timespec ts_rel;
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struct timespec ts_now;
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do {
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// Get current time with requested clock
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if (clock_gettime(clock_id, &ts_now) != 0)
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return -1;
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// Calculate relative timespec
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ts_rel.tv_sec = rqtp->tv_sec - ts_now.tv_sec;
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ts_rel.tv_nsec = rqtp->tv_nsec - ts_now.tv_nsec;
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if (ts_rel.tv_nsec < 0) {
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ts_rel.tv_sec -= 1;
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ts_rel.tv_nsec += 1000*1000*1000;
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}
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// Check if time already elapsed
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if (ts_rel.tv_sec < 0 || (ts_rel.tv_sec == 0 && ts_rel.tv_nsec == 0)) {
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pthread_testcancel();
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return 0;
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}
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// "The absolute clock_nanosleep() function has no effect on the
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// structure referenced by rmtp", so do not pass rmtp here
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} while (nanosleep(&ts_rel, NULL) == 0);
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// If nanosleep failed or was interrupted by a signal,
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// return so the caller can handle it appropriately
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return -1;
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} else if (flags == 0) {
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return nanosleep(rqtp, rmtp);
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} else {
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// Invalid flags
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errno = EINVAL;
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return -1;
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}
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}
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#endif
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