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/*
Copyright (C) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
Laboratory CNBI (Chair in Non-Invasive Brain-Machine Interface)
Nicolas Bourdaud <nicolas.bourdaud@epfl.ch>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stddef.h>
#include <errno.h>
#include <time.h>
#include <errno.h>
#include "portable-time.h"
#ifdef HAVE_NANOSLEEP
static int abs_nanosleep(const struct timespec* req)
{
struct timespec currts, delay;
// Get current time
clock_gettime(CLOCK_REALTIME, &currts);
// Compute the delay between req and currts
if (currts.tv_sec > req->tv_sec)
return 0;
delay.tv_sec = req->tv_sec - currts.tv_sec;
delay.tv_nsec = req->tv_nsec - currts.tv_nsec;
if (delay.tv_nsec < 0) {
delay.tv_nsec += 1000000000;
delay.tv_sec--;
}
// Wait for the relative time
// rerun wait if an interruption has been caught
if (nanosleep(&delay, NULL))
return errno;
return 0;
}
static int rel_nanosleep(const struct timespec* req, struct timespec* rem)
{
if (nanosleep(req, rem))
return errno;
return 0;
}
#elif defined(HAVE_USLEEP)
static int abs_nanosleep(const struct timespec* req)
{
struct timespec ts;
int64_t delay;
while (1) {
clock_gettime(CLOCK_REALTIME, &ts);
delay = (req.tv_sec - ts.tv_sec)*1000000
+(req.tv_nsec - ts.tv_nsec)/1000;
if (delay < 0)
return 0;
if (delay > 1000000)
delay = 1000000;
if (usleep(delay) == EINTR)
return EINTR;
}
}
static int rel_nanosleep(const struct timespec* req, struct timespec* rem)
{
struct timespec ats;
int ret;
clock_gettime(CLOCK_REALTIME, &ats);
ats.tv_sec += req->tv_sec;
ats.tv_nsec += req->tv_nsec;
if (ats.tv_nsec >= 1000000000) {
ats.tv_nsec -= 1000000000;
ats.tv_sec++;
}
ret = abs_nanosleep(&ats);
if ((ret != EINTR) || (rem == NULL))
return ret;
clock_gettime(CLOCK_REALTIME, rem);
rem->tv_sec -= ats.tv_sec;
rem->tv_nsec -= ats.tv_nsec;
if (rem->tv_nsec < 0) {
rem->tv_nsec += 1000000000;
rem->tv_sec++;
}
return EINTR;
}
#elif defined(HAVE_GETSYSTEMTIMEASFILETIME)
#include <windows.h>
/* timespec time are expressed since Epoch i.e. since January, 1, 1970
whereas windows FILETIME since January 1, 1601 (UTC)*/
#define FT_EPOCH (((LONGLONG)27111902 << 32) + (LONGLONG)3577643008)
static void convert_timespec_to_filetime(const struct timespec* ts,
FILETIME* ft, int reltime)
{
ULARGE_INTEGER bigint;
bigint.QuadPart = (LONGLONG)ts->tv_sec*10000000
+ ((LONGLONG)ts->tv_nsec + 50)/100;
if (reltime)
bigint.QuadPart *= -1;
else
bigint.QuadPart += FT_EPOCH;
ft->dwLowDateTime = bigint.LowPart;
ft->dwHighDateTime = bigint.HighPart;
}
static int ft_nanosleep(const struct timespec* req, int reltime)
{
HANDLE htimer;
FILETIME ft;
convert_timespec_to_filetime(req, &ft, reltime);
htimer = CreateWaitableTimer(NULL, TRUE, NULL);
SetWaitableTimer(htimer, (LARGE_INTEGER*)&ft, 0, NULL, NULL, FALSE);
WaitForSingleObject(htimer, INFINITE);
CloseHandle(htimer);
return 0;
}
static int rel_nanosleep(const struct timespec* req, struct timespec* rem)
{
(void)rem;
return ft_nanosleep(req, 1);
}
static int abs_nanosleep(const struct timespec* req)
{
return ft_nanosleep(req, 0);
}
#else
#error No replacement possible for clock_nanosleep
#endif
int clock_nanosleep(clockid_t clock_id, int flags,
const struct timespec *request,
struct timespec *remain)
{
if (request == NULL)
return EFAULT;
if ((request->tv_nsec < 0) || (request->tv_nsec >= 1000000000)
|| ((clock_id != CLOCK_REALTIME)&&(clock_id != CLOCK_MONOTONIC)))
return EINVAL;
if (flags == 0)
return rel_nanosleep(request, remain);
else
return abs_nanosleep(request);
}
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