source: rtems/cpukit/score/src/threadqfirstpriority.c @ 08311cc3

4.104.114.84.95
Last change on this file since 08311cc3 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*
2 *  Thread Queue Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include <rtems/system.h>
16#include <rtems/score/chain.h>
17#include <rtems/score/isr.h>
18#include <rtems/score/object.h>
19#include <rtems/score/states.h>
20#include <rtems/score/thread.h>
21#include <rtems/score/threadq.h>
22#include <rtems/score/tqdata.h>
23
24/*PAGE
25 *
26 *  _Thread_queue_First_priority
27 *
28 *  This routines returns a pointer to the first thread on the
29 *  specified threadq.
30 *
31 *  Input parameters:
32 *    the_thread_queue - pointer to thread queue
33 *
34 *  Output parameters:
35 *    returns - first thread or NULL
36 */
37
38Thread_Control *_Thread_queue_First_priority (
39  Thread_queue_Control *the_thread_queue
40)
41{
42  unsigned32 index;
43
44  for( index=0 ;
45       index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ;
46       index++ ) {
47    if ( !_Chain_Is_empty( &the_thread_queue->Queues.Priority[ index ] ) )
48      return (Thread_Control *)
49        the_thread_queue->Queues.Priority[ index ].first;
50  }
51  return NULL;
52}
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