2025-05-10 21:49:39 +08:00

47 lines
1.1 KiB
C++

/*
* 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);
}