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/**
* @file
*
* @brief Surrenders a Unit to a Semaphore
*
* @ingroup ScoreSemaphore
*/
/*
* 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.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/coresemimpl.h>
CORE_semaphore_Status _CORE_semaphore_Surrender(
CORE_semaphore_Control *the_semaphore,
Objects_Id id,
CORE_semaphore_API_mp_support_callout api_semaphore_mp_support,
ISR_lock_Context *lock_context
)
{
Thread_Control *the_thread;
CORE_semaphore_Status status;
status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
_Thread_queue_Acquire_critical( &the_semaphore->Wait_queue, lock_context );
the_thread = _Thread_queue_First_locked( &the_semaphore->Wait_queue );
if ( the_thread != NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
_Thread_Dispatch_disable();
#endif
_Thread_queue_Extract_critical(
&the_semaphore->Wait_queue,
the_thread,
lock_context
);
#if defined(RTEMS_MULTIPROCESSING)
if ( !_Objects_Is_local_id( the_thread->Object.id ) )
(*api_semaphore_mp_support) ( the_thread, id );
_Thread_Dispatch_enable( _Per_CPU_Get() );
#endif
} else {
if ( the_semaphore->count < the_semaphore->Attributes.maximum_count )
the_semaphore->count += 1;
else
status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
_Thread_queue_Release( &the_semaphore->Wait_queue, lock_context );
}
return status;
}
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