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/**
* @file
*
* @brief RTEMS Create Barrier
* @ingroup ClassicBarrier Barriers
*/
/*
* COPYRIGHT (c) 1989-2006.
* 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.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#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/barrier.h>
/*
* rtems_barrier_create
*
* This directive creates a barrier. A barrier id is returned.
*
* Input parameters:
* name - user defined barrier name
* attribute_set - barrier attributes
* maximum_waiters - number of threads before automatic release
* priority_ceiling - barrier's ceiling priority
* id - pointer to barrier id
*
* Output parameters:
* id - barrier id
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_barrier_create(
rtems_name name,
rtems_attribute attribute_set,
uint32_t maximum_waiters,
rtems_id *id
)
{
Barrier_Control *the_barrier;
CORE_barrier_Attributes the_attributes;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
/* Initialize core barrier attributes */
if ( _Attributes_Is_barrier_automatic( attribute_set ) ) {
the_attributes.discipline = CORE_BARRIER_AUTOMATIC_RELEASE;
if ( maximum_waiters == 0 )
return RTEMS_INVALID_NUMBER;
} else
the_attributes.discipline = CORE_BARRIER_MANUAL_RELEASE;
the_attributes.maximum_count = maximum_waiters;
_Thread_Disable_dispatch(); /* prevents deletion */
the_barrier = _Barrier_Allocate();
if ( !the_barrier ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
the_barrier->attribute_set = attribute_set;
_CORE_barrier_Initialize( &the_barrier->Barrier, &the_attributes );
_Objects_Open(
&_Barrier_Information,
&the_barrier->Object,
(Objects_Name) name
);
*id = the_barrier->Object.id;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
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