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/*

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

 */

#include <pthread.h>

#include <errno.h>

#include <rtems/system.h>

#include <rtems/score/object.h>

#include <rtems/score/states.h>

#include <rtems/score/watchdog.h>

#include <rtems/posix/cond.h>

#include <rtems/posix/time.h>

#include <rtems/posix/mutex.h>

/*PAGE

 *

 *  11.4.4 Waiting on a Condition, P1003.1c/Draft 10, p. 105

 */

int pthread_cond_timedwait(

  pthread_cond_t        *cond,

  pthread_mutex_t       *mutex,

  const struct timespec *abstime

)

{

  Watchdog_Interval timeout;

  struct timespec   current_time;

  struct timespec   difference;

  boolean           already_timedout = FALSE;

  if ( !abstime )

    return EINVAL;

  /*

   *  The abstime is a walltime.  We turn it into an interval.

   */

  (void) clock_gettime( CLOCK_REALTIME, &current_time );

  /* XXX probably some error checking should go here */

  _POSIX_Timespec_subtract( &current_time, abstime, &difference );

  if ( ( difference.tv_sec < 0 ) || ( ( difference.tv_sec == 0 ) &&

       ( difference.tv_nsec < 0 ) ) )

    already_timedout = TRUE;

  timeout = _POSIX_Timespec_to_interval( &difference );

  return _POSIX_Condition_variables_Wait_support(

    cond,

    mutex,

    timeout,

    already_timedout

  );

}