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/*

 *  $Id: nanosleep.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#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;

}