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30 lines
792 B
30 lines
792 B
package sync
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// Waker is used to wake up a sleeper when some event occurs. It debounces
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// multiple wakeup calls occurring between each sleep, and wakeups are
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// non-blocking to avoid having to coordinate goroutines.
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type Waker struct {
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wakeCh chan struct{}
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}
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// NewWaker creates a new Waker.
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func NewWaker() *Waker {
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return &Waker{
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wakeCh: make(chan struct{}, 1), // buffer used for debouncing
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}
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}
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// Sleep returns a channel that blocks until Wake() is called.
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func (w *Waker) Sleep() <-chan struct{} {
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return w.wakeCh
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}
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// Wake wakes up the sleeper.
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func (w *Waker) Wake() {
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// A non-blocking send with a size 1 buffer ensures that we never block, and
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// that we queue up at most a single wakeup call between each Sleep().
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select {
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case w.wakeCh <- struct{}{}:
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default:
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}
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}
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