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/*
* Copyright (c) 2013-2014 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/>.
*/
#include <kern/mutex.h>
#include <kern/mutex_i.h>
#include <kern/spinlock.h>
#include <kern/thread.h>
#include <kern/types.h>
void
mutex_lock_slow(struct mutex *mutex)
{
struct mutex_waiter waiter;
unsigned int state;
spinlock_lock(&mutex->lock);
state = mutex_tryacquire_slow(mutex);
if (state != MUTEX_UNLOCKED) {
waiter.thread = thread_self();
mutex_queue(mutex, &waiter);
mutex_wait(mutex, &waiter);
}
mutex_trydowngrade(mutex);
spinlock_unlock(&mutex->lock);
}
void
mutex_unlock_slow(struct mutex *mutex)
{
spinlock_lock(&mutex->lock);
mutex_signal(mutex);
spinlock_unlock(&mutex->lock);
}
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