source: rtems/cpukit/score/src/threadqdequeue.c @ 25f5730f

4.11
Last change on this file since 25f5730f was c499856, checked in by Chris Johns <chrisj@…>, on Mar 20, 2014 at 9:10:47 PM

Change all references of rtems.com to rtems.org.

  • Property mode set to 100644
File size: 1.3 KB
Line 
1/**
2 * @file
3 *
4 * @brief Thread Queue Dequeue
5 *
6 * @ingroup ScoreThreadQ
7 */
8
9/*
10 *  COPYRIGHT (c) 1989-2008.
11 *  On-Line Applications Research Corporation (OAR).
12 *
13 *  The license and distribution terms for this file may be
14 *  found in the file LICENSE in this distribution or at
15 *  http://www.rtems.org/license/LICENSE.
16 */
17
18#if HAVE_CONFIG_H
19#include "config.h"
20#endif
21
22#include <rtems/score/threadqimpl.h>
23#include <rtems/score/isrlevel.h>
24
25Thread_Control *_Thread_queue_Dequeue(
26  Thread_queue_Control *the_thread_queue
27)
28{
29  Thread_Control *(*dequeue_p)( Thread_queue_Control * );
30  Thread_Control *the_thread;
31  ISR_Level       level;
32  Thread_blocking_operation_States  sync_state;
33
34  if ( the_thread_queue->discipline == THREAD_QUEUE_DISCIPLINE_PRIORITY )
35    dequeue_p = _Thread_queue_Dequeue_priority;
36  else /* must be THREAD_QUEUE_DISCIPLINE_FIFO */
37    dequeue_p = _Thread_queue_Dequeue_fifo;
38
39  the_thread = (*dequeue_p)( the_thread_queue );
40  _ISR_Disable( level );
41    if ( !the_thread ) {
42      sync_state = the_thread_queue->sync_state;
43      if ( (sync_state == THREAD_BLOCKING_OPERATION_TIMEOUT) ||
44           (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) ) {
45        the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SATISFIED;
46        the_thread = _Thread_Executing;
47      }
48    }
49  _ISR_Enable( level );
50  return the_thread;
51}
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