From 81a1fd47447714ed4cb28d0b47644866c40754d7 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sat, 19 May 2018 21:10:34 +0900
Subject: [PATCH] testflock: Use just sync.Mutex on browsers (#615)

---
 internal/testflock/flock_js.go                | 31 +++++++++++++++++++
 .../testflock/{flock.go => flock_notjs.go}    |  2 ++
 2 files changed, 33 insertions(+)
 create mode 100644 internal/testflock/flock_js.go
 rename internal/testflock/{flock.go => flock_notjs.go} (98%)

diff --git a/internal/testflock/flock_js.go b/internal/testflock/flock_js.go
new file mode 100644
index 000000000..78e77285b
--- /dev/null
+++ b/internal/testflock/flock_js.go
@@ -0,0 +1,31 @@
+// Copyright 2018 The Ebiten Authors
+//
+// 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.
+
+// +build js
+
+package testflock
+
+import (
+	"sync"
+)
+
+var theLock sync.Mutex
+
+func Lock() {
+	theLock.Lock()
+}
+
+func Unlock() {
+	theLock.Unlock()
+}
diff --git a/internal/testflock/flock.go b/internal/testflock/flock_notjs.go
similarity index 98%
rename from internal/testflock/flock.go
rename to internal/testflock/flock_notjs.go
index 6b0c18aa6..b7a4c0617 100644
--- a/internal/testflock/flock.go
+++ b/internal/testflock/flock_notjs.go
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// +build !js
+
 // Package testflock provides a lock for testing.
 //
 // There is a CI service like TravisCI where multiple OpenGL processes