/*
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/*
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* Semaphore Manager
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* Semaphore Manager
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*
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*
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* DESCRIPTION:
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* DESCRIPTION:
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*
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*
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* This package is the implementation of the Semaphore Manager.
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* This package is the implementation of the Semaphore Manager.
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* This manager utilizes standard Dijkstra counting semaphores to provide
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* This manager utilizes standard Dijkstra counting semaphores to provide
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* synchronization and mutual exclusion capabilities.
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* synchronization and mutual exclusion capabilities.
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*
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*
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* Directives provided are:
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* Directives provided are:
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*
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*
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* + create a semaphore
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* + create a semaphore
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* + get an ID of a semaphore
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* + get an ID of a semaphore
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* + delete a semaphore
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* + delete a semaphore
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* + acquire a semaphore
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* + acquire a semaphore
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* + release a semaphore
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* + release a semaphore
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*
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*
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* COPYRIGHT (c) 1989-1999.
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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* On-Line Applications Research Corporation (OAR).
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*
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*
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* The license and distribution terms for this file may be
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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* http://www.OARcorp.com/rtems/license.html.
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*
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*
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* $Id: semobtain.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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* $Id: semobtain.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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*/
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*/
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#include <rtems/system.h>
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#include <rtems/system.h>
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/support.h>
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#include <rtems/rtems/support.h>
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#include <rtems/rtems/attr.h>
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#include <rtems/rtems/attr.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/object.h>
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#include <rtems/score/object.h>
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#include <rtems/rtems/options.h>
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#include <rtems/rtems/options.h>
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#include <rtems/rtems/sem.h>
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#include <rtems/rtems/sem.h>
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#include <rtems/score/coremutex.h>
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#include <rtems/score/coremutex.h>
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#include <rtems/score/coresem.h>
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#include <rtems/score/coresem.h>
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#include <rtems/score/states.h>
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#include <rtems/score/states.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/threadq.h>
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#include <rtems/score/threadq.h>
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#if defined(RTEMS_MULTIPROCESSING)
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#if defined(RTEMS_MULTIPROCESSING)
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#include <rtems/score/mpci.h>
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#include <rtems/score/mpci.h>
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#endif
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#endif
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#include <rtems/score/sysstate.h>
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#include <rtems/score/sysstate.h>
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#include <rtems/score/interr.h>
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#include <rtems/score/interr.h>
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|
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/*PAGE
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/*PAGE
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*
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*
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* rtems_semaphore_obtain
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* rtems_semaphore_obtain
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*
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*
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* This directive allows a thread to acquire a semaphore.
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* This directive allows a thread to acquire a semaphore.
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*
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*
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* Input parameters:
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* Input parameters:
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* id - semaphore id
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* id - semaphore id
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* option_set - wait option
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* option_set - wait option
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* timeout - number of ticks to wait (0 means wait forever)
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* timeout - number of ticks to wait (0 means wait forever)
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*
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*
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* Output parameters:
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* Output parameters:
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* RTEMS_SUCCESSFUL - if successful
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* RTEMS_SUCCESSFUL - if successful
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* error code - if unsuccessful
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* error code - if unsuccessful
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*/
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*/
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rtems_status_code rtems_semaphore_obtain(
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rtems_status_code rtems_semaphore_obtain(
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Objects_Id id,
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Objects_Id id,
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unsigned32 option_set,
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unsigned32 option_set,
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rtems_interval timeout
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rtems_interval timeout
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)
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)
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{
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{
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register Semaphore_Control *the_semaphore;
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register Semaphore_Control *the_semaphore;
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Objects_Locations location;
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Objects_Locations location;
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boolean wait;
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boolean wait;
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the_semaphore = _Semaphore_Get( id, &location );
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the_semaphore = _Semaphore_Get( id, &location );
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switch ( location ) {
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switch ( location ) {
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case OBJECTS_REMOTE:
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case OBJECTS_REMOTE:
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#if defined(RTEMS_MULTIPROCESSING)
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#if defined(RTEMS_MULTIPROCESSING)
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return _Semaphore_MP_Send_request_packet(
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return _Semaphore_MP_Send_request_packet(
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SEMAPHORE_MP_OBTAIN_REQUEST,
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SEMAPHORE_MP_OBTAIN_REQUEST,
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id,
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id,
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option_set,
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option_set,
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timeout
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timeout
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);
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);
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#endif
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#endif
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case OBJECTS_ERROR:
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case OBJECTS_ERROR:
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return RTEMS_INVALID_ID;
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return RTEMS_INVALID_ID;
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case OBJECTS_LOCAL:
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case OBJECTS_LOCAL:
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if ( _Options_Is_no_wait( option_set ) )
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if ( _Options_Is_no_wait( option_set ) )
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wait = FALSE;
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wait = FALSE;
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else
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else
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wait = TRUE;
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wait = TRUE;
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if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) {
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if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) {
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_CORE_mutex_Seize(
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_CORE_mutex_Seize(
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&the_semaphore->Core_control.mutex,
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&the_semaphore->Core_control.mutex,
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id,
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id,
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wait,
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wait,
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timeout
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timeout
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);
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);
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_Thread_Enable_dispatch();
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_Thread_Enable_dispatch();
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return _Semaphore_Translate_core_mutex_return_code(
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return _Semaphore_Translate_core_mutex_return_code(
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_Thread_Executing->Wait.return_code );
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_Thread_Executing->Wait.return_code );
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} else {
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} else {
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_CORE_semaphore_Seize(
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_CORE_semaphore_Seize(
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&the_semaphore->Core_control.semaphore,
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&the_semaphore->Core_control.semaphore,
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id,
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id,
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wait,
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wait,
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timeout
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timeout
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);
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);
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_Thread_Enable_dispatch();
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_Thread_Enable_dispatch();
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return _Semaphore_Translate_core_semaphore_return_code(
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return _Semaphore_Translate_core_semaphore_return_code(
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_Thread_Executing->Wait.return_code );
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_Thread_Executing->Wait.return_code );
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}
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}
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}
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}
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return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
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return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
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}
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}
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