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/*
* 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.
*
* $Id$
*/
#include <itron.h>
#include <rtems/itron/semaphore.h>
#include <rtems/itron/task.h>
#include <rtems/score/tod.h>
/*
* cre_sem - Create Semaphore
*
* This function implements the ITRON 3.0 cre_sem() service.
*/
ER cre_sem(
ID semid,
T_CSEM *pk_csem
)
{
CORE_semaphore_Attributes the_semaphore_attributes;
ITRON_Semaphore_Control *the_semaphore;
/*
* Bad pointer to the attributes structure
*/
if ( !pk_csem )
return E_PAR;
/*
* Bits were set that were note defined.
*/
if ( pk_csem->sematr & _ITRON_SEMAPHORE_UNUSED_ATTRIBUTES )
return E_RSATR;
/*
* Initial semaphore count exceeds the maximum.
*/
if ( pk_csem->isemcnt > pk_csem->maxsem )
return E_PAR;
/*
* This error is not in the specification but this condition
* does not make sense.
*/
if ( pk_csem->maxsem == 0 )
return E_PAR;
_Thread_Disable_dispatch(); /* prevents deletion */
the_semaphore = _ITRON_Semaphore_Allocate( semid );
if ( !the_semaphore ) {
_Thread_Enable_dispatch();
return _ITRON_Semaphore_Clarify_allocation_id_error( semid );
}
if ( pk_csem->sematr & TA_TPRI )
the_semaphore_attributes.discipline = CORE_SEMAPHORE_DISCIPLINES_PRIORITY;
else
the_semaphore_attributes.discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO;
the_semaphore_attributes.maximum_count = pk_csem->maxsem;
_CORE_semaphore_Initialize(
&the_semaphore->semaphore,
OBJECTS_ITRON_SEMAPHORES,
&the_semaphore_attributes,
pk_csem->isemcnt,
NULL /* Multiprocessing not supported */
);
_ITRON_Objects_Open( &_ITRON_Semaphore_Information, &the_semaphore->Object );
/*
* If multiprocessing were supported, this is where we would announce
* the existence of the semaphore to the rest of the system.
*/
#if defined(RTEMS_MULTIPROCESSING)
#endif
_Thread_Enable_dispatch();
return E_OK;
}
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