Move top level packages to internal.

internal/model/util.go

@@ -0,0 +1,34 @@
+// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
+// All rights reserved. Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package model
+
+import (
+	"sync"
+	"time"
+)
+
+func deadlockDetect(mut sync.Locker, timeout time.Duration) {
+	go func() {
+		for {
+			time.Sleep(timeout / 4)
+			ok := make(chan bool, 2)
+
+			go func() {
+				mut.Lock()
+				mut.Unlock()
+				ok <- true
+			}()
+
+			go func() {
+				time.Sleep(timeout)
+				ok <- false
+			}()
+
+			if r := <-ok; !r {
+				panic("deadlock detected")
+			}
+		}
+	}()
+}