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/**
* @file
*
* @brief Release a Spinlock
* @ingroup ScoreSpinlock
*/
/*
* 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/score/corespinlockimpl.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/watchdog.h>
CORE_spinlock_Status _CORE_spinlock_Release(
CORE_spinlock_Control *the_spinlock
)
{
ISR_Level level;
_ISR_Disable( level );
/*
* It must locked before it can be unlocked.
*/
if ( the_spinlock->lock == CORE_SPINLOCK_UNLOCKED ) {
_ISR_Enable( level );
return CORE_SPINLOCK_NOT_LOCKED;
}
/*
* It must locked by the current thread before it can be unlocked.
*/
if ( the_spinlock->holder != _Thread_Executing->Object.id ) {
_ISR_Enable( level );
return CORE_SPINLOCK_NOT_HOLDER;
}
/*
* Let it be unlocked.
*/
the_spinlock->users -= 1;
the_spinlock->lock = CORE_SPINLOCK_UNLOCKED;
the_spinlock->holder = 0;
_ISR_Enable( level );
return CORE_SPINLOCK_SUCCESSFUL;
}
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