source: rtems/c/src/exec/rtems/src/semrelease.c @ ab654be

4.104.114.84.95
Last change on this file since ab654be was ab654be, checked in by Joel Sherrill <joel.sherrill@…>, on Jul 6, 2000 at 7:35:44 PM

Cleaned up to avoid disruptive use of inline conditionals.

  • Property mode set to 100644
File size: 3.0 KB
Line 
1/*
2 *  Semaphore Manager
3 *
4 *  DESCRIPTION:
5 *
6 *  This package is the implementation of the Semaphore Manager.
7 *  This manager utilizes standard Dijkstra counting semaphores to provide
8 *  synchronization and mutual exclusion capabilities.
9 *
10 *  Directives provided are:
11 *
12 *     + create a semaphore
13 *     + get an ID of a semaphore
14 *     + delete a semaphore
15 *     + acquire a semaphore
16 *     + release a semaphore
17 *
18 *  COPYRIGHT (c) 1989-1999.
19 *  On-Line Applications Research Corporation (OAR).
20 *
21 *  The license and distribution terms for this file may be
22 *  found in the file LICENSE in this distribution or at
23 *  http://www.OARcorp.com/rtems/license.html.
24 *
25 *  $Id$
26 */
27
28#include <rtems/system.h>
29#include <rtems/rtems/status.h>
30#include <rtems/rtems/support.h>
31#include <rtems/rtems/attr.h>
32#include <rtems/score/isr.h>
33#include <rtems/score/object.h>
34#include <rtems/rtems/options.h>
35#include <rtems/rtems/sem.h>
36#include <rtems/score/coremutex.h>
37#include <rtems/score/coresem.h>
38#include <rtems/score/states.h>
39#include <rtems/score/thread.h>
40#include <rtems/score/threadq.h>
41#if defined(RTEMS_MULTIPROCESSING)
42#include <rtems/score/mpci.h>
43#endif
44#include <rtems/score/sysstate.h>
45
46#include <rtems/score/interr.h>
47
48/*PAGE
49 *
50 *  rtems_semaphore_release
51 *
52 *  This directive allows a thread to release a semaphore.
53 *
54 *  Input parameters:
55 *    id - semaphore id
56 *
57 *  Output parameters:
58 *    RTEMS_SUCCESSFUL - if successful
59 *    error code        - if unsuccessful
60 */
61
62#if defined(RTEMS_MULTIPROCESSING)
63#define MUTEX_MP_SUPPORT _Semaphore_Core_mutex_mp_support
64#else
65#define MUTEX_MP_SUPPORT NULL
66#endif
67
68rtems_status_code rtems_semaphore_release(
69  Objects_Id id
70)
71{
72  register Semaphore_Control *the_semaphore;
73  Objects_Locations           location;
74  CORE_mutex_Status           mutex_status;
75  CORE_semaphore_Status       semaphore_status;
76
77  the_semaphore = _Semaphore_Get( id, &location );
78  switch ( location ) {
79
80    case OBJECTS_REMOTE:
81#if defined(RTEMS_MULTIPROCESSING)
82      return _Semaphore_MP_Send_request_packet(
83        SEMAPHORE_MP_RELEASE_REQUEST,
84        id,
85        0,                               /* Not used */
86        MPCI_DEFAULT_TIMEOUT
87      );
88#endif
89
90    case OBJECTS_ERROR:
91      return RTEMS_INVALID_ID;
92
93    case OBJECTS_LOCAL:
94      if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) {
95        mutex_status = _CORE_mutex_Surrender(
96          &the_semaphore->Core_control.mutex,
97          id,
98          MUTEX_MP_SUPPORT
99        );
100        _Thread_Enable_dispatch();
101        return _Semaphore_Translate_core_mutex_return_code( mutex_status );
102      } else {
103        semaphore_status = _CORE_semaphore_Surrender(
104          &the_semaphore->Core_control.semaphore,
105          id,
106          MUTEX_MP_SUPPORT
107        );
108        _Thread_Enable_dispatch();
109        return
110          _Semaphore_Translate_core_semaphore_return_code( semaphore_status );
111      }
112  }
113
114  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
115}
Note: See TracBrowser for help on using the repository browser.