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29 lines
714 B
Go
29 lines
714 B
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipnlocal
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import "sync"
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// LocalBackendFuture is a Future that returns a *LocalBackend.
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type LocalBackendFuture struct {
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getOnce sync.Once
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ch chan *LocalBackend
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v *LocalBackend
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}
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func (f *LocalBackendFuture) Get() *LocalBackend {
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f.getOnce.Do(f.get)
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return f.v
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}
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func (f *LocalBackendFuture) get() { f.v = <-f.ch }
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func (f *LocalBackendFuture) Set(v *LocalBackend) { f.ch <- v }
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func NewLocalBackendFuture() *LocalBackendFuture {
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return &LocalBackendFuture{
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ch: make(chan *LocalBackend, 1),
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}
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}
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