Adding upstream version 3.10.8.

Signed-off-by: Daniel Baumann <daniel@debian.org>

util/terminate.go

@@ -0,0 +1,42 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package util
+
+import (
+	"context"
+)
+
+// Terminated terminated
+type Terminated struct{}
+
+func (err Terminated) Error() string {
+	return "execution is terminated"
+}
+
+func MaybeTerminate(ctx context.Context) {
+	select {
+	case <-ctx.Done():
+		panic(Terminated{})
+	default:
+	}
+}
+
+func CatchTerminate(f func()) (status bool) {
+	status = false
+	defer func() {
+		if r := recover(); r != nil {
+			_, ok := r.(Terminated)
+			if ok {
+				status = true
+			} else {
+				panic(r)
+			}
+		}
+	}()
+
+	f()
+
+	return status
+}