use plain pkg module

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

pkg/sync/mutex_test.go

@@ -0,0 +1,33 @@
+package sync
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+)
+
+func HammerMutex(m *NamedRWMutex, loops int, c chan bool) {
+	for i := 0; i < loops; i++ {
+		id := fmt.Sprintf("%v", i)
+		m.Lock(id)
+		m.Unlock(id)
+	}
+	c <- true
+}
+
+func TestNamedRWMutex(t *testing.T) {
+	if n := runtime.SetMutexProfileFraction(1); n != 0 {
+		t.Logf("got mutexrate %d expected 0", n)
+	}
+	defer runtime.SetMutexProfileFraction(0)
+	m := NewNamedRWMutex()
+	c := make(chan bool)
+	r := 10
+
+	for i := 0; i < r; i++ {
+		go HammerMutex(&m, 2000, c)
+	}
+	for i := 0; i < r; i++ {
+		<-c
+	}
+}