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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 <time.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/scheduler.h>
#include <rtems/score/thread.h>
#include <rtems/score/tod.h>
#include <rtems/seterr.h>
#include <rtems/score/timespec.h>
/*
* 14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269
*/
int nanosleep(
const struct timespec *rqtp,
struct timespec *rmtp
)
{
Watchdog_Interval ticks;
/*
* Return EINVAL if the delay interval is negative.
*
* NOTE: This behavior is beyond the POSIX specification.
* FSU and GNU/Linux pthreads shares this behavior.
*/
if ( !_Timespec_Is_valid( rqtp ) )
rtems_set_errno_and_return_minus_one( EINVAL );
ticks = _Timespec_To_ticks( rqtp );
/*
* A nanosleep for zero time is implemented as a yield.
* This behavior is also beyond the POSIX specification but is
* consistent with the RTEMS API and yields desirable behavior.
*/
if ( !ticks ) {
_Thread_Disable_dispatch();
_Scheduler_Yield();
_Thread_Enable_dispatch();
if ( rmtp ) {
rmtp->tv_sec = 0;
rmtp->tv_nsec = 0;
}
return 0;
}
/*
* Block for the desired amount of time
*/
_Thread_Disable_dispatch();
_Thread_Set_state(
_Thread_Executing,
STATES_DELAYING | STATES_INTERRUPTIBLE_BY_SIGNAL
);
_Watchdog_Initialize(
&_Thread_Executing->Timer,
_Thread_Delay_ended,
_Thread_Executing->Object.id,
NULL
);
_Watchdog_Insert_ticks( &_Thread_Executing->Timer, ticks );
_Thread_Enable_dispatch();
/* calculate time remaining */
if ( rmtp ) {
ticks -=
_Thread_Executing->Timer.stop_time - _Thread_Executing->Timer.start_time;
_Timespec_From_ticks( ticks, rmtp );
/*
* Only when POSIX is enabled, can a sleep be interrupted.
*/
#if defined(RTEMS_POSIX_API)
/*
* If there is time remaining, then we were interrupted by a signal.
*/
if ( ticks )
rtems_set_errno_and_return_minus_one( EINTR );
#endif
}
return 0;
}
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