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package client
import (
"sync/atomic"
)
// TryLock implement the classic "try-lock" operation.
type TryLock struct {
n int32
}
// Lock tries to lock the try-lock. If successful, it returns true.
// Otherwise, it returns false immedidately.
func (c *TryLock) Lock() error {
if !atomic.CompareAndSwapInt32(&c.n, 0, 1) {
return errDoubleLock
}
return nil
}
// Unlock unlocks the try-lock.
func (c *TryLock) Unlock() {
atomic.StoreInt32(&c.n, 0)
}
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