35 lines
817 B
Go
35 lines
817 B
Go
package chansync
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import (
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"github.com/anacrolix/chansync/events"
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"github.com/anacrolix/sync"
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)
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// Can be used as zero-value. Due to the caller needing to bring their own synchronization, an
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// equivalent to "sync".Cond.Signal is not provided. BroadcastCond is intended to be selected on
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// with other channels.
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type BroadcastCond struct {
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mu sync.Mutex
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ch chan struct{}
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}
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func (me *BroadcastCond) Broadcast() {
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me.mu.Lock()
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defer me.mu.Unlock()
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if me.ch != nil {
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close(me.ch)
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me.ch = nil
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}
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}
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// Should be called before releasing locks on resources that might trigger subsequent Broadcasts.
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// The channel is closed when the condition changes.
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func (me *BroadcastCond) Signaled() events.Signaled {
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me.mu.Lock()
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defer me.mu.Unlock()
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if me.ch == nil {
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me.ch = make(chan struct{})
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}
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return me.ch
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}
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