source: rtems/cpukit/score/src/threadqdequeue.c @ 11c16a64

4.104.114.9
Last change on this file since 11c16a64 was 11c16a64, checked in by Joel Sherrill <joel.sherrill@…>, on Jan 22, 2008 at 9:19:18 PM

2008-01-22 Joel Sherrill <joel.sherrill@…>

  • rtems/src/eventsurrender.c, rtems/src/ratemonperiod.c, score/src/threadqdequeue.c, score/src/threadqdequeuefifo.c, score/src/threadqdequeuepriority.c: Fix bugs encountered while testing and clean up more code.
  • Property mode set to 100644
File size: 1.9 KB
Line 
1/*
2 *  Thread Queue Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-2008.
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.rtems.com/license/LICENSE.
11 *
12 *  $Id$
13 */
14
15#if HAVE_CONFIG_H
16#include "config.h"
17#endif
18
19#include <rtems/system.h>
20#include <rtems/score/chain.h>
21#include <rtems/score/isr.h>
22#include <rtems/score/object.h>
23#include <rtems/score/states.h>
24#include <rtems/score/thread.h>
25#include <rtems/score/threadq.h>
26#include <rtems/score/tqdata.h>
27
28/*PAGE
29 *
30 *  _Thread_queue_Dequeue
31 *
32 *  This routine removes a thread from the specified threadq.  If the
33 *  threadq discipline is FIFO, it unblocks a thread, and cancels its
34 *  timeout timer.  Priority discipline is processed elsewhere.
35 *
36 *  Input parameters:
37 *    the_thread_queue - pointer to threadq
38 *
39 *  Output parameters:
40 *    returns - thread dequeued or NULL
41 *
42 *  INTERRUPT LATENCY:
43 *    check sync
44 */
45
46Thread_Control *_Thread_queue_Dequeue(
47  Thread_queue_Control *the_thread_queue
48)
49{
50  Thread_Control *(*dequeue_p)( Thread_queue_Control * );
51  Thread_Control *the_thread;
52  ISR_Level       level;
53  Thread_blocking_operation_States  sync_state;
54
55  if ( the_thread_queue->discipline == THREAD_QUEUE_DISCIPLINE_PRIORITY )
56    dequeue_p = _Thread_queue_Dequeue_priority;
57  else /* must be THREAD_QUEUE_DISCIPLINE_FIFO */
58    dequeue_p = _Thread_queue_Dequeue_fifo;
59
60  the_thread = (*dequeue_p)( the_thread_queue );
61  _ISR_Disable( level );
62    if ( !the_thread ) {
63      sync_state = the_thread_queue->sync_state;
64      if ( (sync_state == THREAD_BLOCKING_OPERATION_TIMEOUT) ||
65           (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) ) {
66        the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SATISFIED;
67        the_thread = _Thread_Executing;
68      }
69    }
70  _ISR_Enable( level );
71  return the_thread;
72}
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