source: rtems/cpukit/score/src/coresemsurrender.c @ 75063f00

Last change on this file since 75063f00 was 75063f00, checked in by Joel Sherrill <joel.sherrill@…>, on Jul 7, 2003 at 6:03:05 PM

2003-07-07 Joel Sherrill <joel@…>

PR 417/rtems

  • src/coresemsurrender.c: Correct incorrect check for maximum_count reported by Sergei Organov <osv@…>.
  • Property mode set to 100644
File size: 2.0 KB
Line 
1/*
2 *  CORE Semaphore Handler
3 *
4 *  DESCRIPTION:
5 *
6 *  This package is the implementation of the CORE Semaphore Handler.
7 *  This core object utilizes standard Dijkstra counting semaphores to provide
8 *  synchronization and mutual exclusion capabilities.
9 *
10 *  COPYRIGHT (c) 1989-1999.
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.OARcorp.com/rtems/license.html.
16 *
17 *  $Id$
18 */
19
20#include <rtems/system.h>
21#include <rtems/score/isr.h>
22#include <rtems/score/coresem.h>
23#include <rtems/score/states.h>
24#include <rtems/score/thread.h>
25#include <rtems/score/threadq.h>
26#if defined(RTEMS_MULTIPROCESSING)
27#include <rtems/score/mpci.h>
28#endif
29
30/*PAGE
31 *
32 *  _CORE_semaphore_Surrender
33 *
34 *  Input parameters:
35 *    the_semaphore            - the semaphore to be flushed
36 *    id                       - id of parent semaphore
37 *    api_semaphore_mp_support - api dependent MP support actions
38 *
39 *  Output parameters:
40 *    CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful
41 *    core error code                  - if unsuccessful
42 *
43 *  Output parameters:
44 */
45
46CORE_semaphore_Status _CORE_semaphore_Surrender(
47  CORE_semaphore_Control                *the_semaphore,
48  Objects_Id                             id,
49  CORE_semaphore_API_mp_support_callout  api_semaphore_mp_support
50)
51{
52  Thread_Control *the_thread;
53  ISR_Level       level;
54  CORE_semaphore_Status status;
55
56  status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
57
58  if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) {
59
60    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
61      (*api_semaphore_mp_support) ( the_thread, id );
62
63  } else {
64    _ISR_Disable( level );
65      if ( the_semaphore->count < the_semaphore->Attributes.maximum_count )
66        the_semaphore->count += 1;
67      else
68        status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
69    _ISR_Enable( level );
70  }
71
72  return status;
73}
74
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