mirror of
https://github.com/openharmony/communication_t2stack.git
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Agrant
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/*
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* Copyright (C) 2021 Huawei Device Co., Ltd.
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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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#ifndef SPINLOCK_H
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#define SPINLOCK_H
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typedef struct {
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volatile int lock;
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} Spinlock;
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#if defined(__x86_64__)
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#include <emmintrin.h>
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inline static void Pause(void)
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{
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_mm_pause();
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}
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#elif defined(RTP_ARCH_ARM)
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static inline void Pause(void)
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{
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asm volatile("yield" ::: "memory");
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}
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#else
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static inline void Pause(void)
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{
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}
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#endif
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static inline void SpinLockInit(Spinlock *spinlock)
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{
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spinlock->lock = 0;
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}
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static inline int SpinLockTryLock(Spinlock *spinlock)
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{
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if (__sync_bool_compare_and_swap(&spinlock->lock, 0, 1) == 0) {
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return 0;
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}
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return 1;
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}
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static inline void SpinLock(Spinlock *spinlock)
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{
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while (!SpinLockTryLock(spinlock)) {
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do {
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Pause();
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} while (!!spinlock->lock);
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}
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}
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static inline void SpinUnlock(Spinlock *spinlock)
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{
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__sync_lock_release(&spinlock->lock);
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}
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#endif /* SPINLOCK_H */
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