1 files changed, 34 insertions, 0 deletions
diff --git a/chromium/mojo/shell/keep_alive.cc b/chromium/mojo/shell/keep_alive.cc
new file mode 100644
index 00000000000..387c6a790c3
--- /dev/null
+++ b/chromium/mojo/shell/keep_alive.cc
@@ -0,0 +1,34 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/shell/keep_alive.h"
+
+#include "base/bind.h"
+#include "mojo/shell/context.h"
+
+namespace mojo {
+namespace shell {
+
+KeepAlive::KeepAlive(Context* context) : context_(context) {
+  DCHECK(context_->task_runners()->ui_runner()->RunsTasksOnCurrentThread());
+  ++context_->keep_alive_counter()->count_;
+}
+
+KeepAlive::~KeepAlive() {
+  DCHECK(context_->task_runners()->ui_runner()->RunsTasksOnCurrentThread());
+  if (--context_->keep_alive_counter()->count_ == 0) {
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&KeepAlive::MaybeQuit, context_));
+  }
+}
+
+// static
+void KeepAlive::MaybeQuit(Context* context) {
+  if (context->keep_alive_counter()->count_ == 0)
+    base::MessageLoop::current()->Quit();
+}
+
+}  // namespace shell
+}  // namespace mojo