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/*
* libdivecomputer
*
* Copyright (C) 2018 Jef Driesen
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#ifdef _WIN32
#define NOGDI
#include <windows.h>
#else
#include <time.h>
#include <sys/time.h>
#ifdef HAVE_MACH_MACH_TIME_H
#include <mach/mach_time.h>
#endif
#endif
#include "timer.h"
struct dc_timer_t {
#if defined (_WIN32)
LARGE_INTEGER timestamp;
LARGE_INTEGER frequency;
#elif defined (HAVE_CLOCK_GETTIME)
struct timespec timestamp;
#elif defined (HAVE_MACH_ABSOLUTE_TIME)
uint64_t timestamp;
mach_timebase_info_data_t info;
#else
struct timeval timestamp;
#endif
};
dc_status_t
dc_timer_new (dc_timer_t **out)
{
dc_timer_t *timer = NULL;
if (out == NULL)
return DC_STATUS_INVALIDARGS;
timer = (dc_timer_t *) malloc (sizeof (dc_timer_t));
if (timer == NULL) {
return DC_STATUS_NOMEMORY;
}
#if defined (_WIN32)
if (!QueryPerformanceFrequency(&timer->frequency) ||
!QueryPerformanceCounter(&timer->timestamp)) {
free(timer);
return DC_STATUS_IO;
}
#elif defined (HAVE_CLOCK_GETTIME)
if (clock_gettime(CLOCK_MONOTONIC, &timer->timestamp) != 0) {
free(timer);
return DC_STATUS_IO;
}
#elif defined (HAVE_MACH_ABSOLUTE_TIME)
if (mach_timebase_info(&timer->info) != KERN_SUCCESS) {
free(timer);
return DC_STATUS_IO;
}
timer->timestamp = mach_absolute_time();
#else
if (gettimeofday (&timer->timestamp, NULL) != 0) {
free(timer);
return DC_STATUS_IO;
}
#endif
*out = timer;
return DC_STATUS_SUCCESS;
}
dc_status_t
dc_timer_now (dc_timer_t *timer, dc_usecs_t *usecs)
{
dc_status_t status = DC_STATUS_SUCCESS;
dc_usecs_t value = 0;
if (timer == NULL) {
status = DC_STATUS_INVALIDARGS;
goto out;
}
#if defined (_WIN32)
LARGE_INTEGER now;
if (!QueryPerformanceCounter(&now)) {
status = DC_STATUS_IO;
goto out;
}
value = (now.QuadPart - timer->timestamp.QuadPart) * 1000000 / timer->frequency.QuadPart;
#elif defined (HAVE_CLOCK_GETTIME)
struct timespec now, delta;
if (clock_gettime(CLOCK_MONOTONIC, &now) != 0) {
status = DC_STATUS_IO;
goto out;
}
if (now.tv_nsec < timer->timestamp.tv_nsec) {
delta.tv_nsec = 1000000000 + now.tv_nsec - timer->timestamp.tv_nsec;
delta.tv_sec = now.tv_sec - timer->timestamp.tv_sec - 1;
} else {
delta.tv_nsec = now.tv_nsec - timer->timestamp.tv_nsec;
delta.tv_sec = now.tv_sec - timer->timestamp.tv_sec;
}
value = (dc_usecs_t) delta.tv_sec * 1000000 + delta.tv_nsec / 1000;
#elif defined (HAVE_MACH_ABSOLUTE_TIME)
uint64_t now = mach_absolute_time();
value = (now - timer->timestamp) * timer->info.numer / (timer->info.denom * 1000);
#else
struct timeval now, delta;
if (gettimeofday (&now, NULL) != 0) {
status = DC_STATUS_IO;
goto out;
}
timersub (&now, &timer->timestamp, &delta);
value = (dc_usecs_t) delta.tv_sec * 1000000 + delta.tv_usec;
#endif
out:
if (usecs)
*usecs = value;
return status;
}
dc_status_t
dc_timer_free (dc_timer_t *timer)
{
free (timer);
return DC_STATUS_SUCCESS;
}
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