source: rtems/cpukit/score/src/coresemseize.c @ f5c9b89

Last change on this file since f5c9b89 was f5c9b89, checked in by Joel Sherrill <joel.sherrill@…>, on Oct 30, 2006 at 10:21:07 PM

2006-10-30 Joel Sherrill <joel@…>

PR 841/rtems

  • itron/inline/rtems/itron/semaphore.inl, itron/macros/rtems/itron/semaphore.inl, itron/src/twai_sem.c, posix/include/rtems/posix/semaphore.h, posix/inline/rtems/posix/semaphore.inl, posix/src/semaphorewaitsupp.c, posix/src/semtimedwait.c, posix/src/semwait.c, rtems/src/semobtain.c, rtems/src/semtranslatereturncode.c, score/include/rtems/score/coresem.h, score/src/coresemseize.c: Make sem_timedwait more conformant to Open Group specification.
  • Property mode set to 100644
File size: 2.4 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.rtems.com/license/LICENSE.
16 *
17 *  $Id$
18 */
19
20#if HAVE_CONFIG_H
21#include "config.h"
22#endif
23
24#include <rtems/system.h>
25#include <rtems/score/isr.h>
26#include <rtems/score/coresem.h>
27#include <rtems/score/states.h>
28#include <rtems/score/thread.h>
29#include <rtems/score/threadq.h>
30#if defined(RTEMS_MULTIPROCESSING)
31#include <rtems/score/mpci.h>
32#endif
33
34/*PAGE
35 *
36 *  _CORE_semaphore_Seize
37 *
38 *  This routine attempts to allocate a core semaphore to the calling thread.
39 *
40 *  Input parameters:
41 *    the_semaphore - pointer to semaphore control block
42 *    id            - id of object to wait on
43 *    wait          - TRUE if wait is allowed, FALSE otherwise
44 *    timeout       - number of ticks to wait (0 means forever)
45 *
46 *  Output parameters:  NONE
47 *
48 *  INTERRUPT LATENCY:
49 *    available
50 *    wait
51 */
52
53void _CORE_semaphore_Seize(
54  CORE_semaphore_Control         *the_semaphore,
55  Objects_Id                      id,
56  Core_semaphore_Blocking_option  wait,
57  Watchdog_Interval               timeout
58)
59{
60  Thread_Control *executing;
61  ISR_Level       level;
62
63  executing = _Thread_Executing;
64  executing->Wait.return_code = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
65  _ISR_Disable( level );
66  if ( the_semaphore->count != 0 ) {
67    the_semaphore->count -= 1;
68    _ISR_Enable( level );
69    return;
70  }
71
72  switch ( wait ) {
73    case CORE_SEMAPHORE_NO_WAIT:
74      _ISR_Enable( level );
75      executing->Wait.return_code = CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT;
76      return;
77    case CORE_SEMAPHORE_BAD_TIMEOUT:
78      executing->Wait.return_code = CORE_SEMAPHORE_BAD_TIMEOUT_VALUE;
79      return;
80    case CORE_SEMAPHORE_BLOCK_FOREVER:
81    case CORE_SEMAPHORE_BLOCK_WITH_TIMEOUT:
82      _Thread_queue_Enter_critical_section( &the_semaphore->Wait_queue );
83      executing->Wait.queue          = &the_semaphore->Wait_queue;
84      executing->Wait.id             = id;
85      _ISR_Enable( level );
86      _Thread_queue_Enqueue( &the_semaphore->Wait_queue, timeout );
87      break;
88  }
89
90}
Note: See TracBrowser for help on using the repository browser.