source: rtems/c/src/exec/score/src/threadqdequeue.c @ df49c60

4.104.114.84.95
Last change on this file since df49c60 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: 1.5 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_Dequeue
27 *
28 *  This routine removes a thread from the specified threadq.  If the
29 *  threadq discipline is FIFO, it unblocks a thread, and cancels its
30 *  timeout timer.  Priority discipline is processed elsewhere.
31 *
32 *  Input parameters:
33 *    the_thread_queue - pointer to threadq
34 *
35 *  Output parameters:
36 *    returns - thread dequeued or NULL
37 *
38 *  INTERRUPT LATENCY:
39 *    check sync
40 */
41
42Thread_Control *_Thread_queue_Dequeue(
43  Thread_queue_Control *the_thread_queue
44)
45{
46  Thread_Control *the_thread;
47
48  switch ( the_thread_queue->discipline ) {
49    case THREAD_QUEUE_DISCIPLINE_FIFO:
50      the_thread = _Thread_queue_Dequeue_fifo( the_thread_queue );
51      break;
52    case THREAD_QUEUE_DISCIPLINE_PRIORITY:
53      the_thread = _Thread_queue_Dequeue_priority( the_thread_queue );
54      break;
55    default:              /* this is only to prevent warnings */
56      the_thread = NULL;
57      break;
58  }
59
60  return( the_thread );
61}
62
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