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27 lines
396 B
Go
27 lines
396 B
Go
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//go:build !go1.22
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package once
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import (
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"sync"
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"sync/atomic"
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"unsafe"
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)
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type Once struct {
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done uint32
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m sync.Mutex
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}
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func Done(once *sync.Once) bool {
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// atomic visit sync.Once.done
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return atomic.LoadUint32((*uint32)(unsafe.Pointer(once))) == 1
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}
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func Reset(once *sync.Once) {
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o := (*Once)(unsafe.Pointer(once))
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o.m.Lock()
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defer o.m.Unlock()
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atomic.StoreUint32(&o.done, 0)
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}
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