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/*

 *  Thread Queue Handler

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: threadqtimeout.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/chain.h>

#include <rtems/score/isr.h>

#include <rtems/score/object.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/score/threadq.h>

#include <rtems/score/tqdata.h>

/*PAGE

 *

 *  _Thread_queue_Timeout

 *

 *  This routine processes a thread which timeouts while waiting on

 *  a thread queue. It is called by the watchdog handler.

 *

 *  Input parameters:

 *    id - thread id

 *

 *  Output parameters: NONE

 */

void _Thread_queue_Timeout(

  Objects_Id  id,

  void       *ignored

)

{

  Thread_Control       *the_thread;

  Thread_queue_Control *the_thread_queue;

  Objects_Locations     location;

  the_thread = _Thread_Get( id, &location );

  switch ( location ) {

    case OBJECTS_ERROR:

    case OBJECTS_REMOTE:  /* impossible */

      break;

    case OBJECTS_LOCAL:

      the_thread_queue = the_thread->Wait.queue;

      /*

       *  If the_thread_queue is not synchronized, then it is either

       *  "nothing happened", "timeout", or "satisfied".   If the_thread

       *  is the executing thread, then it is in the process of blocking

       *  and it is the thread which is responsible for the synchronization

       *  process.

       *

       *  If it is not satisfied, then it is "nothing happened" and

       *  this is the "timeout" transition.  After a request is satisfied,

       *  a timeout is not allowed to occur.

       */

      if ( the_thread_queue->sync_state != THREAD_QUEUE_SYNCHRONIZED &&

           _Thread_Is_executing( the_thread ) ) {

        if ( the_thread_queue->sync_state != THREAD_QUEUE_SATISFIED )

          the_thread_queue->sync_state = THREAD_QUEUE_TIMEOUT;

      } else {

        the_thread->Wait.return_code = the_thread->Wait.queue->timeout_status;

        _Thread_queue_Extract( the_thread->Wait.queue, the_thread );

      }

      _Thread_Unnest_dispatch();

      break;

  }

}