66 lines
1.1 KiB
Go
66 lines
1.1 KiB
Go
package missinggo
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import "sync"
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// Events are boolean flags that provide a channel that's closed when true.
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// This could go in the sync package, but that's more of a debug wrapper on
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// the standard library sync.
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type Event struct {
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ch chan struct{}
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closed bool
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}
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func (me *Event) LockedChan(lock sync.Locker) <-chan struct{} {
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lock.Lock()
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ch := me.C()
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lock.Unlock()
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return ch
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}
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// Returns a chan that is closed when the event is true.
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func (me *Event) C() <-chan struct{} {
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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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// TODO: Merge into Set.
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func (me *Event) Clear() {
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if me.closed {
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me.ch = nil
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me.closed = false
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}
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}
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// Set the event to true/on.
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func (me *Event) Set() (first bool) {
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if me.closed {
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return false
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}
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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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close(me.ch)
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me.closed = true
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return true
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}
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// TODO: Change to Get.
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func (me *Event) IsSet() bool {
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return me.closed
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}
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func (me *Event) Wait() {
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<-me.C()
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}
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// TODO: Merge into Set.
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func (me *Event) SetBool(b bool) {
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if b {
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me.Set()
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} else {
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me.Clear()
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}
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}
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