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/*------------------------------------------------------------------------
* Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader 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 Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with the ZBar Bar Code Reader; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* http://sourceforge.net/projects/zbar
*------------------------------------------------------------------------*/
#ifndef _ZBAR_TIMER_H_
#define _ZBAR_TIMER_H_
#include <time.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h> /* gettimeofday */
#endif
/* platform timer abstraction
*
* zbar_timer_t stores the absolute expiration of a delay from
* when the timer was initialized.
*
* _zbar_timer_init() initialized timer with specified ms delay.
* returns timer or NULL if timeout < 0 (no/infinite timeout)
* _zbar_timer_check() returns ms remaining until expiration.
* will be <= 0 if timer has expired
*/
#if _POSIX_TIMERS > 0
typedef struct timespec zbar_timer_t;
static inline int _zbar_timer_now()
{
struct timespec now;
clock_gettime(CLOCK_REALTIME, &now);
return (now.tv_sec * 1000 + now.tv_nsec / 1000000);
}
static inline zbar_timer_t *_zbar_timer_init(zbar_timer_t *timer, int delay)
{
if (delay < 0)
return (NULL);
clock_gettime(CLOCK_REALTIME, timer);
timer->tv_nsec += (delay % 1000) * 1000000;
timer->tv_sec += (delay / 1000) + (timer->tv_nsec / 1000000000);
timer->tv_nsec %= 1000000000;
return (timer);
}
static inline int _zbar_timer_check(zbar_timer_t *timer)
{
struct timespec now;
int delay;
if (!timer)
return (-1);
clock_gettime(CLOCK_REALTIME, &now);
delay = ((timer->tv_sec - now.tv_sec) * 1000 +
(timer->tv_nsec - now.tv_nsec) / 1000000);
return ((delay >= 0) ? delay : 0);
}
#elif defined(_WIN32)
#include <windows.h>
typedef DWORD zbar_timer_t;
static inline int _zbar_timer_now()
{
return (timeGetTime());
}
static inline zbar_timer_t *_zbar_timer_init(zbar_timer_t *timer, int delay)
{
if (delay < 0)
return (NULL);
*timer = timeGetTime() + delay;
return (timer);
}
static inline int _zbar_timer_check(zbar_timer_t *timer)
{
int delay;
if (!timer)
return (INFINITE);
delay = *timer - timeGetTime();
return ((delay >= 0) ? delay : 0);
}
#elif defined(HAVE_SYS_TIME_H)
typedef struct timeval zbar_timer_t;
static inline int _zbar_timer_now()
{
struct timeval now;
gettimeofday(&now, NULL);
return (now.tv_sec * 1000 + now.tv_usec / 1000);
}
static inline zbar_timer_t *_zbar_timer_init(zbar_timer_t *timer, int delay)
{
if (delay < 0)
return (NULL);
gettimeofday(timer, NULL);
timer->tv_usec += (delay % 1000) * 1000;
timer->tv_sec += (delay / 1000) + (timer->tv_usec / 1000000);
timer->tv_usec %= 1000000;
return (timer);
}
static inline int _zbar_timer_check(zbar_timer_t *timer)
{
struct timeval now;
if (!timer)
return (-1);
gettimeofday(&now, NULL);
return ((timer->tv_sec - now.tv_sec) * 1000 +
(timer->tv_usec - now.tv_usec) / 1000);
}
#else
#error "unable to find a timer interface"
#endif
#endif
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