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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: threadqfirst.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_First

 *

 *  This routines returns a pointer to the first thread on the

 *  specified threadq.

 *

 *  Input parameters:

 *    the_thread_queue - pointer to thread queue

 *

 *  Output parameters:

 *    returns - first thread or NULL

 */

Thread_Control *_Thread_queue_First(

  Thread_queue_Control *the_thread_queue

)

{

  Thread_Control *the_thread;

  switch ( the_thread_queue->discipline ) {

    case THREAD_QUEUE_DISCIPLINE_FIFO:

      the_thread = _Thread_queue_First_fifo( the_thread_queue );

      break;

    case THREAD_QUEUE_DISCIPLINE_PRIORITY:

      the_thread = _Thread_queue_First_priority( the_thread_queue );

      break;

    default:              /* this is only to prevent warnings */

      the_thread = NULL;

      break;

  }

  return the_thread;

}