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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [posix/] [src/] [nanosleep.c] - Blame information for rev 173

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1 30 unneback
/*
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 *  $Id: nanosleep.c,v 1.2 2001-09-27 11:59:17 chris Exp $
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 */
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#include <assert.h>
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#include <time.h>
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#include <errno.h>
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#include <rtems/system.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/tod.h>
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#include <rtems/posix/seterr.h>
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#include <rtems/posix/time.h>
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/*PAGE
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 *
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 *  14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269
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 */
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int nanosleep(
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  const struct timespec  *rqtp,
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  struct timespec        *rmtp
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)
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{
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  Watchdog_Interval  ticks;
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  struct timespec   *the_rqtp;
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  if ( !rqtp )
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    set_errno_and_return_minus_one( EINVAL );
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  the_rqtp = (struct timespec *)rqtp;
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  /*
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   *  Return EAGAIN if the delay interval is negative.
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   *
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   *  NOTE:  This behavior is beyond the POSIX specification.
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   *         FSU pthreads shares this behavior.
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   */
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  if ( the_rqtp->tv_sec < 0 )
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    the_rqtp->tv_sec = 0;
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  if ( /* the_rqtp->tv_sec < 0 || */ the_rqtp->tv_nsec < 0 )
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    set_errno_and_return_minus_one( EAGAIN );
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  if ( the_rqtp->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
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    set_errno_and_return_minus_one( EINVAL );
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  ticks = _POSIX_Timespec_to_interval( the_rqtp );
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  /*
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   *  This behavior is also beyond the POSIX specification but is
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   *  consistent with the RTEMS api and yields desirable behavior.
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   */
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  if ( !ticks ) {
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    _Thread_Disable_dispatch();
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      _Thread_Yield_processor();
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    _Thread_Enable_dispatch();
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    if ( rmtp ) {
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       rmtp->tv_sec = 0;
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       rmtp->tv_nsec = 0;
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    }
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    return 0;
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  }
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  _Thread_Disable_dispatch();
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    _Thread_Set_state(
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      _Thread_Executing,
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      STATES_DELAYING | STATES_INTERRUPTIBLE_BY_SIGNAL
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    );
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    _Watchdog_Initialize(
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      &_Thread_Executing->Timer,
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      _Thread_Delay_ended,
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      _Thread_Executing->Object.id,
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      NULL
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    );
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    _Watchdog_Insert_ticks( &_Thread_Executing->Timer, ticks );
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  _Thread_Enable_dispatch();
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  /* calculate time remaining */
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  if ( rmtp ) {
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    ticks -=
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      _Thread_Executing->Timer.stop_time - _Thread_Executing->Timer.start_time;
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    _POSIX_Interval_to_timespec( ticks, rmtp );
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    /*
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     *  If there is time remaining, then we were interrupted by a signal.
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     */
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    if ( ticks )
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      set_errno_and_return_minus_one( EINTR );
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  }
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  return 0;
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}

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