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/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#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 ( !_Timespec_Is_valid( abstime ) ) {
blocking = CORE_SEMAPHORE_BAD_TIMEOUT_VALUE;
} else {
_TOD_Get( ¤t_time );
/*
* Make sure the abstime is in the future
*/
if ( _Timespec_Less_than( abstime, ¤t_time ) ) {
blocking = CORE_SEMAPHORE_BAD_TIMEOUT;
} else {
_Timespec_Subtract( ¤t_time, abstime, &difference );
ticks = _Timespec_To_ticks( &difference );
blocking = CORE_SEMAPHORE_BLOCK_WITH_TIMEOUT;
}
}
return _POSIX_Semaphore_Wait_support( sem, blocking, ticks );
}
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