spinlock.h

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/**
 *  spinlock.h - Define spinlock functions.
 *
 *  Copyright (C) 2008  ZhangHu
 *  All rights reserved.
 *  E-MAIL: [e-mail]
 *
 *  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 __SPINLOCK_H__
#define __SPINLOCK_H__

#include "include/types.h"


typedef struct spinlock {
    volatile uword_t slock;            // 0-busy, 1-free.
} spinlock_t;

// The following functions should be implemented with assemble language,
void spin_init(spinlock_t *lock);      // Initialize a spinlock.
void spin_lock(spinlock_t *lock);      // Lock a spinlock.
void spin_unlock(spinlock_t *lock);    // Unlock a spinlock.
bool_t spin_trylock(spinlock_t *lock); // Try to lock a spinlock.


#endif