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/*
* $Id$
*/
#include <assert.h>
#include <time.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/tod.h>
#include <rtems/posix/seterr.h>
#include <rtems/posix/time.h>
/*PAGE
*
* 14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269
*/
int nanosleep(
const struct timespec *rqtp,
struct timespec *rmtp
)
{
Watchdog_Interval ticks;
struct timespec *the_rqtp;
if ( !rqtp )
set_errno_and_return_minus_one( EINVAL );
the_rqtp = (struct timespec *)rqtp;
/*
* Return EAGAIN if the delay interval is negative.
*
* NOTE: This behavior is beyond the POSIX specification.
* FSU pthreads shares this behavior.
*/
if ( the_rqtp->tv_sec < 0 )
the_rqtp->tv_sec = 0;
if ( /* the_rqtp->tv_sec < 0 || */ the_rqtp->tv_nsec < 0 )
set_errno_and_return_minus_one( EAGAIN );
if ( the_rqtp->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
set_errno_and_return_minus_one( EINVAL );
ticks = _POSIX_Timespec_to_interval( the_rqtp );
/*
* This behavior is also beyond the POSIX specification but is
* consistent with the RTEMS api and yields desirable behavior.
*/
if ( !ticks ) {
_Thread_Disable_dispatch();
_Thread_Yield_processor();
_Thread_Enable_dispatch();
if ( rmtp ) {
rmtp->tv_sec = 0;
rmtp->tv_nsec = 0;
}
return 0;
}
_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;
_POSIX_Interval_to_timespec( ticks, rmtp );
/*
* If there is time remaining, then we were interrupted by a signal.
*/
if ( ticks )
set_errno_and_return_minus_one( EINTR );
}
return 0;
}
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