try sync.Mutex

Author: mattn

dep_test.go

@@ -21,7 +21,7 @@ import (
 
 var (
 	exeSuffix string // ".exe" on Windows
-	mu        sync.RWMutex
+	mu        sync.Mutex
 )
 
 func init() {
@@ -200,8 +200,8 @@ func (tg *testgoData) doRun(args []string) error {
 // run runs the test go command, and expects it to succeed.
 func (tg *testgoData) run(args ...string) {
 	if runtime.GOOS == "windows" {
-		mu.RLock()
-		defer mu.RUnlock()
+		mu.Lock()
+		defer mu.Unlock()
 	}
 	if status := tg.doRun(args); status != nil {
 		tg.t.Logf("go %v failed unexpectedly: %v", args, status)