forked from Imagelibrary/rtems
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/**
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* @file
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*
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* @brief Release a Spinlock
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* @ingroup ScoreSpinlock
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*/
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/*
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* COPYRIGHT (c) 1989-2006.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/system.h>
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#include <rtems/score/corespinlockimpl.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/watchdog.h>
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CORE_spinlock_Status _CORE_spinlock_Release(
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CORE_spinlock_Control *the_spinlock
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)
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{
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ISR_Level level;
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_ISR_Disable( level );
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/*
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* It must locked before it can be unlocked.
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*/
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if ( the_spinlock->lock == CORE_SPINLOCK_UNLOCKED ) {
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_ISR_Enable( level );
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return CORE_SPINLOCK_NOT_LOCKED;
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}
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/*
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* It must locked by the current thread before it can be unlocked.
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*/
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if ( the_spinlock->holder != _Thread_Executing->Object.id ) {
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_ISR_Enable( level );
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return CORE_SPINLOCK_NOT_HOLDER;
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}
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/*
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* Let it be unlocked.
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*/
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the_spinlock->users -= 1;
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the_spinlock->lock = CORE_SPINLOCK_UNLOCKED;
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the_spinlock->holder = 0;
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_ISR_Enable( level );
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return CORE_SPINLOCK_SUCCESSFUL;
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}
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