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/*
* COPYRIGHT (c) 1989-2011.
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/smplock.h>
void _SMP_lock_Spinlock_Initialize(
SMP_lock_Control *lock
)
{
*lock = 0;
}
ISR_Level _SMP_lock_Spinlock_Obtain(
SMP_lock_Control *lock
)
{
ISR_Level level;
uint32_t value = 1;
uint32_t previous;
/* Note: Disable provides an implicit memory barrier. */
_ISR_Disable( level );
do {
SMP_CPU_SWAP( lock, value, previous );
} while (previous == 1);
return level;
}
void _SMP_lock_Spinlock_Release(
SMP_lock_Control *lock,
ISR_Level level
)
{
*lock = 0;
_ISR_Enable( level );
}
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