source: rtems/cpukit/score/src/threadqdequeuefifo.c @ 3168deaa

4.104.114.9
Last change on this file since 3168deaa was 3168deaa, checked in by Joel Sherrill <joel.sherrill@…>, on Jan 22, 2008 at 6:28:53 PM

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

  • rtems/include/rtems/rtems/event.h, rtems/inline/rtems/rtems/eventset.inl, rtems/src/event.c, rtems/src/eventseize.c, rtems/src/eventsurrender.c, rtems/src/eventtimeout.c, score/Makefile.am, score/preinstall.am, score/include/rtems/score/interr.h, score/include/rtems/score/thread.h, score/include/rtems/score/threadq.h, score/include/rtems/score/tqdata.h, score/inline/rtems/score/threadq.inl, score/inline/rtems/score/tqdata.inl, score/src/threadq.c, score/src/threadqdequeue.c, score/src/threadqdequeuefifo.c, score/src/threadqdequeuepriority.c, score/src/threadqenqueue.c, score/src/threadqenqueuefifo.c, score/src/threadqenqueuepriority.c, score/src/threadqextract.c, score/src/threadqextractfifo.c, score/src/threadqextractpriority.c, score/src/threadqextractwithproxy.c, score/src/threadqfirst.c, score/src/threadqfirstfifo.c, score/src/threadqfirstpriority.c, score/src/threadqflush.c, score/src/threadqrequeue.c, score/src/threadqtimeout.c: Refactor thread queue enqueue and event blocking synchronization critical sections. This resulted in three copies of essentially the same hard to test critical section code becoming the one shared routine _Thread_blocking_operation_Cancel. In addition, the thread queue and event code now share a common synchronization enumerated type. Along the way, switches were reworked to eliminate dead code generated by gcc and comments and copyrights were updated.
  • score/include/rtems/score/threadsync.h, score/src/threadblockingoperationcancel.c: New files.
  • Property mode set to 100644
File size: 2.2 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_fifo
31 *
32 *  This routine removes a thread from the specified threadq.
33 *
34 *  Input parameters:
35 *    the_thread_queue - pointer to threadq
36 *
37 *  Output parameters:
38 *    returns - thread dequeued or NULL
39 *
40 *  INTERRUPT LATENCY:
41 *    check sync
42 *    FIFO
43 */
44
45Thread_Control *_Thread_queue_Dequeue_fifo(
46  Thread_queue_Control *the_thread_queue
47)
48{
49  ISR_Level              level;
50  Thread_Control *the_thread;
51
52  _ISR_Disable( level );
53  if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) {
54
55    the_thread = (Thread_Control *)
56       _Chain_Get_first_unprotected( &the_thread_queue->Queues.Fifo );
57
58    the_thread->Wait.queue = NULL;
59    if ( !_Watchdog_Is_active( &the_thread->Timer ) ) {
60      _ISR_Enable( level );
61      _Thread_Unblock( the_thread );
62    } else {
63      _Watchdog_Deactivate( &the_thread->Timer );
64      _ISR_Enable( level );
65      (void) _Watchdog_Remove( &the_thread->Timer );
66      _Thread_Unblock( the_thread );
67    }
68
69#if defined(RTEMS_MULTIPROCESSING)
70    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
71      _Thread_MP_Free_proxy( the_thread );
72#endif
73
74    return the_thread;
75  }
76
77  switch ( the_thread_queue->sync_state ) {
78    case THREAD_BLOCKING_OPERATION_SYNCHRONIZED:
79    case THREAD_BLOCKING_OPERATION_SATISFIED:
80      _ISR_Enable( level );
81      return NULL;
82
83    case THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED:
84    case THREAD_BLOCKING_OPERATION_TIMEOUT:
85      the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SATISFIED;
86      _ISR_Enable( level );
87      return _Thread_Executing;
88  }
89  return NULL;                /* this is only to prevent warnings */
90}
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