From: qydysky <qydysky@foxmail.com>
Date: Sat, 26 Sep 2020 03:36:37 +0000 (+0800)
Subject: 82
X-Git-Tag: v0.0.2~4
X-Git-Url: http://127.0.0.1:8081/?a=commitdiff_plain;h=76a93d21bf41b4575fcc781c4b2765c999b98549;p=part%2F.git

82
---

diff --git a/Signal.go b/Signal.go
new file mode 100644
index 0000000..0dd25b3
--- /dev/null
+++ b/Signal.go
@@ -0,0 +1,27 @@
+package part
+
+type signal struct{
+	v chan struct{}
+}
+
+func Signal() (o *signal) {
+	return &signal{v:make(chan struct{})}
+}
+
+func (i *signal) Wait() {
+	<-i.v
+}
+
+func (i *signal) Done() {
+	if i.Islive() {close(i.v)}
+}
+
+func (i *signal) Islive() (islive bool) {
+	select {
+	case <-i.v:;
+	default:
+		if i.v == nil {break}
+		islive = true
+	}
+	return
+}
\ No newline at end of file