add deadlock mutex package

write to deadlock stderr after closing gocui

more deadlock checking

vendor/github.com/petermattis/goid/goid.go

@@ -0,0 +1,35 @@
+// Copyright 2016 Peter Mattis.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// permissions and limitations under the License. See the AUTHORS file
+// for names of contributors.
+
+package goid
+
+import (
+	"bytes"
+	"runtime"
+	"strconv"
+)
+
+func ExtractGID(s []byte) int64 {
+	s = s[len("goroutine "):]
+	s = s[:bytes.IndexByte(s, ' ')]
+	gid, _ := strconv.ParseInt(string(s), 10, 64)
+	return gid
+}
+
+// Parse the goid from runtime.Stack() output. Slow, but it works.
+func getSlow() int64 {
+	var buf [64]byte
+	return ExtractGID(buf[:runtime.Stack(buf[:], false)])
+}