xref: /OK3568_Linux_fs/external/mpp/osal/mpp_lock.cpp (revision 4882a59341e53eb6f0b4789bf948001014eff981)

/*
 * Copyright 2021 Rockchip Electronics Co. LTD
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define MODULE_TAG "mpp_lock"

#include "mpp_log.h"
#include "mpp_lock.h"

#define LOCK_IDLE   0
#define LOCK_BUSY   1

void mpp_spinlock_init(spinlock_t *lock)
{
    MPP_SYNC_CLR(&lock->lock);
}

void mpp_spinlock_lock(spinlock_t *lock)
{
    while (!MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY)) {
        asm("NOP");
        asm("NOP");
    }
}

void mpp_spinlock_unlock(spinlock_t *lock)
{
    MPP_SYNC_CLR(&lock->lock);
}

bool mpp_spinlock_trylock(spinlock_t *lock)
{
    return MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY);
}