mirror of
https://github.com/gravitational/teleport
synced 2024-10-22 10:13:21 +00:00
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
/*
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Copyright 2015 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"sync"
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)
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// NewCloseBroadcaster returns new instance of close broadcaster
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func NewCloseBroadcaster() *CloseBroadcaster {
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return &CloseBroadcaster{
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C: make(chan struct{}),
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}
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}
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// CloseBroadcaster is a helper struct
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// that implements io.Closer and uses channel
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// to broadcast it's closed state once called
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type CloseBroadcaster struct {
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sync.Once
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C chan struct{}
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}
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// Close closes channel (once) to start broadcasting it's closed state
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func (b *CloseBroadcaster) Close() error {
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b.Do(func() {
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close(b.C)
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})
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return nil
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}
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