147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*------------------------------------------------------------------------
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* Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
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*
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* This file is part of the ZBar Bar Code Reader.
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*
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* The ZBar Bar Code Reader is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* The ZBar Bar Code Reader is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser Public License for more details.
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*
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* You should have received a copy of the GNU Lesser Public License
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* along with the ZBar Bar Code Reader; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*
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* http://sourceforge.net/projects/zbar
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*------------------------------------------------------------------------*/
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#ifndef _ZBAR_TIMER_H_
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#define _ZBAR_TIMER_H_
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#include <time.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h> /* gettimeofday */
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#endif
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/* platform timer abstraction
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*
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* zbar_timer_t stores the absolute expiration of a delay from
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* when the timer was initialized.
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*
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* _zbar_timer_init() initialized timer with specified ms delay.
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* returns timer or NULL if timeout < 0 (no/infinite timeout)
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* _zbar_timer_check() returns ms remaining until expiration.
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* will be <= 0 if timer has expired
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*/
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#if _POSIX_TIMERS > 0
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typedef struct timespec zbar_timer_t;
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static inline int _zbar_timer_now()
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{
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struct timespec now;
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clock_gettime(CLOCK_REALTIME, &now);
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return (now.tv_sec * 1000 + now.tv_nsec / 1000000);
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}
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static inline zbar_timer_t *_zbar_timer_init(zbar_timer_t *timer, int delay)
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{
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if (delay < 0)
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return (NULL);
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clock_gettime(CLOCK_REALTIME, timer);
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timer->tv_nsec += (delay % 1000) * 1000000;
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timer->tv_sec += (delay / 1000) + (timer->tv_nsec / 1000000000);
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timer->tv_nsec %= 1000000000;
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return (timer);
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}
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static inline int _zbar_timer_check(zbar_timer_t *timer)
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{
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struct timespec now;
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int delay;
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if (!timer)
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return (-1);
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clock_gettime(CLOCK_REALTIME, &now);
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delay = ((timer->tv_sec - now.tv_sec) * 1000 +
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(timer->tv_nsec - now.tv_nsec) / 1000000);
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return ((delay >= 0) ? delay : 0);
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}
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#elif defined(_WIN32)
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#include <windows.h>
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typedef DWORD zbar_timer_t;
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static inline int _zbar_timer_now()
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{
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return (timeGetTime());
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}
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static inline zbar_timer_t *_zbar_timer_init(zbar_timer_t *timer, int delay)
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{
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if (delay < 0)
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return (NULL);
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*timer = timeGetTime() + delay;
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return (timer);
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}
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static inline int _zbar_timer_check(zbar_timer_t *timer)
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{
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int delay;
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if (!timer)
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return (INFINITE);
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delay = *timer - timeGetTime();
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return ((delay >= 0) ? delay : 0);
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}
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#elif defined(HAVE_SYS_TIME_H)
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typedef struct timeval zbar_timer_t;
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static inline int _zbar_timer_now()
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{
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struct timeval now;
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gettimeofday(&now, NULL);
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return (now.tv_sec * 1000 + now.tv_usec / 1000);
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}
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static inline zbar_timer_t *_zbar_timer_init(zbar_timer_t *timer, int delay)
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{
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if (delay < 0)
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return (NULL);
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gettimeofday(timer, NULL);
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timer->tv_usec += (delay % 1000) * 1000;
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timer->tv_sec += (delay / 1000) + (timer->tv_usec / 1000000);
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timer->tv_usec %= 1000000;
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return (timer);
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}
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static inline int _zbar_timer_check(zbar_timer_t *timer)
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{
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struct timeval now;
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if (!timer)
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return (-1);
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gettimeofday(&now, NULL);
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return ((timer->tv_sec - now.tv_sec) * 1000 +
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(timer->tv_usec - now.tv_usec) / 1000);
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}
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#else
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#error "unable to find a timer interface"
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#endif
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#endif
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