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/*
* Copyright (c) 2013-2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _KERN_MUTEX_I_H
#define _KERN_MUTEX_I_H
#ifndef X15_MUTEX_PI
#include <kern/assert.h>
#include <kern/atomic.h>
#include <kern/mutex_types.h>
#define MUTEX_UNLOCKED 0
#define MUTEX_LOCKED 1
#define MUTEX_CONTENDED 2
static inline unsigned int
mutex_lock_fast(struct mutex *mutex)
{
return atomic_cas_acquire(&mutex->state, MUTEX_UNLOCKED, MUTEX_LOCKED);
}
static inline unsigned int
mutex_unlock_fast(struct mutex *mutex)
{
unsigned int state;
state = atomic_swap_release(&mutex->state, MUTEX_UNLOCKED);
assert((state == MUTEX_LOCKED) || (state == MUTEX_CONTENDED));
return state;
}
void mutex_lock_slow(struct mutex *mutex);
void mutex_unlock_slow(struct mutex *mutex);
#endif /* X15_MUTEX_PI */
#endif /* _KERN_MUTEX_I_H */
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