source: rtems/cpukit/score/src/threadqdequeuefifo.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: 2.1 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_Dequeue_fifo
28 *
29 *  This routine removes a thread from the specified threadq.
30 *
31 *  Input parameters:
32 *    the_thread_queue - pointer to threadq
33 *
34 *  Output parameters:
35 *    returns - thread dequeued or NULL
36 *
37 *  INTERRUPT LATENCY:
38 *    check sync
39 *    FIFO
40 */
41
42Thread_Control *_Thread_queue_Dequeue_fifo(
43  Thread_queue_Control *the_thread_queue
44)
45{
46  ISR_Level              level;
47  Thread_Control *the_thread;
48
49  _ISR_Disable( level );
50  if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) {
51
52    the_thread = (Thread_Control *)
53       _Chain_Get_first_unprotected( &the_thread_queue->Queues.Fifo );
54
55    if ( !_Watchdog_Is_active( &the_thread->Timer ) ) {
56      _ISR_Enable( level );
57      _Thread_Unblock( the_thread );
58    } else {
59      _Watchdog_Deactivate( &the_thread->Timer );
60      _ISR_Enable( level );
61      (void) _Watchdog_Remove( &the_thread->Timer );
62      _Thread_Unblock( the_thread );
63    }
64
65#if defined(RTEMS_MULTIPROCESSING)
66    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
67      _Thread_MP_Free_proxy( the_thread );
68#endif
69
70    return the_thread;
71  } 
72
73  switch ( the_thread_queue->sync_state ) {
74    case THREAD_QUEUE_SYNCHRONIZED:
75    case THREAD_QUEUE_SATISFIED:
76      _ISR_Enable( level );
77      return NULL;
78
79    case THREAD_QUEUE_NOTHING_HAPPENED:
80    case THREAD_QUEUE_TIMEOUT:
81      the_thread_queue->sync_state = THREAD_QUEUE_SATISFIED;
82      _ISR_Enable( level );
83      return _Thread_Executing;
84  }
85  return NULL;                /* this is only to prevent warnings */
86}
87
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