mirror of
https://github.com/gravitational/teleport.git
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47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 its 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 its 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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