init: 1.0.0

pkg/syncx/donechan.go

@@ -0,0 +1,32 @@
+package syncx
+
+import (
+	"sync"
+
+	"github.com/perfect-panel/ppanel-server/pkg/lang"
+)
+
+// A DoneChan is used as a channel that can be closed multiple times and wait for done.
+type DoneChan struct {
+	done chan lang.PlaceholderType
+	once sync.Once
+}
+
+// NewDoneChan returns a DoneChan.
+func NewDoneChan() *DoneChan {
+	return &DoneChan{
+		done: make(chan lang.PlaceholderType),
+	}
+}
+
+// Close closes dc, it's safe to close more than once.
+func (dc *DoneChan) Close() {
+	dc.once.Do(func() {
+		close(dc.done)
+	})
+}
+
+// Done returns a channel that can be notified on dc closed.
+func (dc *DoneChan) Done() chan lang.PlaceholderType {
+	return dc.done
+}