source: rtems/c/src/exec/score/src/threadqenqueuefifo.c @ 9b05600

4.104.114.84.95
Last change on this file since 9b05600 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: 2.4 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_Enqueue_fifo
27 *
28 *  This routine blocks a thread, places it on a thread, and optionally
29 *  starts a timeout timer.
30 *
31 *  Input parameters:
32 *    the_thread_queue - pointer to threadq
33 *    the_thread       - pointer to the thread to block
34 *    timeout          - interval to wait
35 *
36 *  Output parameters: NONE
37 *
38 *  INTERRUPT LATENCY:
39 *    only case
40 */
41
42void _Thread_queue_Enqueue_fifo (
43  Thread_queue_Control *the_thread_queue,
44  Thread_Control       *the_thread,
45  Watchdog_Interval    timeout
46)
47{
48  ISR_Level            level;
49  Thread_queue_States  sync_state;
50
51  _ISR_Disable( level );
52
53  sync_state = the_thread_queue->sync_state;
54  the_thread_queue->sync_state = THREAD_QUEUE_SYNCHRONIZED;
55
56  switch ( sync_state ) {
57    case THREAD_QUEUE_SYNCHRONIZED:
58      /*
59       *  This should never happen.  It indicates that someone did not
60       *  enter a thread queue critical section.
61       */
62      break;
63
64    case THREAD_QUEUE_NOTHING_HAPPENED:
65      _Chain_Append_unprotected(
66        &the_thread_queue->Queues.Fifo,
67        &the_thread->Object.Node
68      );
69      _ISR_Enable( level );
70      return;
71
72    case THREAD_QUEUE_TIMEOUT:
73      the_thread->Wait.return_code = the_thread->Wait.queue->timeout_status;
74      _ISR_Enable( level );
75      break;
76
77    case THREAD_QUEUE_SATISFIED:
78      if ( _Watchdog_Is_active( &the_thread->Timer ) ) {
79        _Watchdog_Deactivate( &the_thread->Timer );
80        _ISR_Enable( level );
81        (void) _Watchdog_Remove( &the_thread->Timer );
82      } else
83        _ISR_Enable( level );
84      break;
85  }
86
87  /*
88   *  Global objects with thread queue's should not be operated on from an
89   *  ISR.  But the sync code still must allow short timeouts to be processed
90   *  correctly.
91   */
92
93  _Thread_Unblock( the_thread );
94
95#if defined(RTEMS_MULTIPROCESSING)
96  if ( !_Objects_Is_local_id( the_thread->Object.id ) )
97    _Thread_MP_Free_proxy( the_thread );
98#endif
99
100}
101
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