source: rtems/cpukit/score/src/threadqfirstpriority.c @ dfbfa2b0

4.104.114.84.95
Last change on this file since dfbfa2b0 was dfbfa2b0, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 2, 1999 at 8:36:11 PM

Split threadq.c into multiple files.

  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*
2 *  Thread Queue Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-1998.
6 *  On-Line Applications Research Corporation (OAR).
7 *  Copyright assigned to U.S. Government, 1994.
8 *
9 *  The license and distribution terms for this file may be
10 *  found in the file LICENSE in this distribution or at
11 *  http://www.OARcorp.com/rtems/license.html.
12 *
13 *  $Id$
14 */
15
16#include <rtems/system.h>
17#include <rtems/score/chain.h>
18#include <rtems/score/isr.h>
19#include <rtems/score/object.h>
20#include <rtems/score/states.h>
21#include <rtems/score/thread.h>
22#include <rtems/score/threadq.h>
23#include <rtems/score/tqdata.h>
24
25/*PAGE
26 *
27 *  _Thread_queue_First_priority
28 *
29 *  This routines returns a pointer to the first thread on the
30 *  specified threadq.
31 *
32 *  Input parameters:
33 *    the_thread_queue - pointer to thread queue
34 *
35 *  Output parameters:
36 *    returns - first thread or NULL
37 */
38
39Thread_Control *_Thread_queue_First_priority (
40  Thread_queue_Control *the_thread_queue
41)
42{
43  unsigned32 index;
44
45  for( index=0 ;
46       index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ;
47       index++ ) {
48    if ( !_Chain_Is_empty( &the_thread_queue->Queues.Priority[ index ] ) )
49      return (Thread_Control *)
50        the_thread_queue->Queues.Priority[ index ].first;
51  }
52  return NULL;
53}
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