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用golang实现一个自旋锁

admin 11月 13, 2020 0

In software engineering, a spinlock is a lock which causes a thread trying to acquire it to simply wait in a loop (“spin”) while repeatedly checking if the lock is available(摘自wikipedia)。

利用cpu提供的原子原语来实现。

直接上码

type spinLock uint32
func (sl *spinLock) () {
	for !atomic.CompareAndSwapUint32((*uint32)(sl), 0, 1) {
		runtime.Gosched()
	}
}
func (sl *spinLock) Unlock() {
	atomic.StoreUint32((*uint32)(sl), 0)
}
func NewSpinLock() sync.Locker {
	var lock spinLock
	return &lock
}