/*
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* Copyright 2021 Rockchip Electronics Co. LTD
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define MODULE_TAG "mpp_lock"
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#include "mpp_log.h"
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#include "mpp_lock.h"
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#define LOCK_IDLE 0
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#define LOCK_BUSY 1
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void mpp_spinlock_init(spinlock_t *lock)
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{
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MPP_SYNC_CLR(&lock->lock);
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}
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void mpp_spinlock_lock(spinlock_t *lock)
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{
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while (!MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY)) {
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asm("NOP");
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asm("NOP");
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}
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}
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void mpp_spinlock_unlock(spinlock_t *lock)
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{
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MPP_SYNC_CLR(&lock->lock);
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}
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bool mpp_spinlock_trylock(spinlock_t *lock)
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{
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return MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY);
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}
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