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/*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdarg.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <limits.h>
#include <rtems/system.h>
#include <rtems/score/object.h>
#include <rtems/posix/semaphore.h>
#include <rtems/posix/time.h>
#include <rtems/seterr.h>
/*PAGE
*
* 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226
*
* NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27
*/
int sem_timedwait(
sem_t *sem,
const struct timespec *abstime
)
{
/*
* The abstime is a walltime. We turn it into an interval.
*/
Watchdog_Interval ticks = 0;
struct timespec current_time;
struct timespec difference;
Core_semaphore_Blocking_option blocking = CORE_SEMAPHORE_BLOCK_WITH_TIMEOUT;
/*
* Error check the absolute time to timeout
*/
#if 0
if ( /* abstime->tv_sec < 0 || */ abstime->tv_nsec ) /* tv_sec is unsigned */
blocking = CORE_SEMAPHORE_BAD_TIMEOUT_VALUE;
else
#endif
if ( abstime->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
blocking = CORE_SEMAPHORE_BAD_TIMEOUT_VALUE;
else {
(void) clock_gettime( CLOCK_REALTIME, ¤t_time );
/*
* Make sure the abstime is in the future
*/
if ( abstime->tv_sec < current_time.tv_sec )
blocking = CORE_SEMAPHORE_BAD_TIMEOUT_VALUE;
else if ( (abstime->tv_sec == current_time.tv_sec) &&
(abstime->tv_nsec <= current_time.tv_nsec) )
blocking = CORE_SEMAPHORE_BAD_TIMEOUT_VALUE;
else {
_POSIX_Timespec_subtract( ¤t_time, abstime, &difference );
ticks = _POSIX_Timespec_to_interval( &difference );
blocking = CORE_SEMAPHORE_BLOCK_WITH_TIMEOUT;
}
}
return _POSIX_Semaphore_Wait_support( sem, blocking, ticks );
}
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