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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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/corespinlockimpl.h>
#include <rtems/score/percpu.h>
Status_Control _CORE_spinlock_Surrender(
CORE_spinlock_Control *the_spinlock,
ISR_lock_Context *lock_context
)
{
_CORE_spinlock_Acquire_critical( the_spinlock, lock_context );
/*
* It must locked by the current thread before it can be unlocked.
*/
if (
the_spinlock->lock != CORE_SPINLOCK_LOCKED
|| the_spinlock->holder != _Thread_Executing
) {
_CORE_spinlock_Release( the_spinlock, lock_context );
return STATUS_NOT_OWNER;
}
/*
* Let it be unlocked.
*/
the_spinlock->users -= 1;
the_spinlock->lock = CORE_SPINLOCK_UNLOCKED;
the_spinlock->holder = 0;
_CORE_spinlock_Release( the_spinlock, lock_context );
return STATUS_SUCCESSFUL;
}
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