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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [rtems/] [src/] [semrelease.c] - Blame information for rev 1780

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/*
 *  Semaphore Manager
 *
 *  DESCRIPTION:
 *
 *  This package is the implementation of the Semaphore Manager.
 *  This manager utilizes standard Dijkstra counting semaphores to provide
 *  synchronization and mutual exclusion capabilities.
 *
 *  Directives provided are:
 *
 *     + create a semaphore
 *     + get an ID of a semaphore
 *     + delete a semaphore
 *     + acquire a semaphore
 *     + release a semaphore
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  semrelease.c,v 1.4 2000/07/06 19:35:44 joel Exp
 */
 
#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/rtems/attr.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/rtems/options.h>
#include <rtems/rtems/sem.h>
#include <rtems/score/coremutex.h>
#include <rtems/score/coresem.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/mpci.h>
#endif
#include <rtems/score/sysstate.h>
 
#include <rtems/score/interr.h>
 
/*PAGE
 *
 *  rtems_semaphore_release
 *
 *  This directive allows a thread to release a semaphore.
 *
 *  Input parameters:
 *    id - semaphore id
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */
 
#if defined(RTEMS_MULTIPROCESSING)
#define MUTEX_MP_SUPPORT _Semaphore_Core_mutex_mp_support
#else
#define MUTEX_MP_SUPPORT NULL
#endif
 
rtems_status_code rtems_semaphore_release(
  Objects_Id id
)
{
  register Semaphore_Control *the_semaphore;
  Objects_Locations           location;
  CORE_mutex_Status           mutex_status;
  CORE_semaphore_Status       semaphore_status;
 
  the_semaphore = _Semaphore_Get( id, &location );
  switch ( location ) {
 
    case OBJECTS_REMOTE:
#if defined(RTEMS_MULTIPROCESSING)
      return _Semaphore_MP_Send_request_packet(
        SEMAPHORE_MP_RELEASE_REQUEST,
        id,
        0,                               /* Not used */
        MPCI_DEFAULT_TIMEOUT
      );
#endif
 
    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;
 
    case OBJECTS_LOCAL:
      if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) {
        mutex_status = _CORE_mutex_Surrender(
          &the_semaphore->Core_control.mutex,
          id,
          MUTEX_MP_SUPPORT
        );
        _Thread_Enable_dispatch();
        return _Semaphore_Translate_core_mutex_return_code( mutex_status );
      } else {
        semaphore_status = _CORE_semaphore_Surrender(
          &the_semaphore->Core_control.semaphore,
          id,
          MUTEX_MP_SUPPORT
        );
        _Thread_Enable_dispatch();
        return
          _Semaphore_Translate_core_semaphore_return_code( semaphore_status );
      }
  }
 
  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
}

Line No.	Rev	Author	Line
1	1026	ivang	`/*`
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			`* semrelease.c,v 1.4 2000/07/06 19:35:44 joel Exp`
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
68			`rtems_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			`}`

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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [rtems/] [src/] [semrelease.c] - Blame information for rev 1780