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diff --git a/src/type3_AndroidCloud/anbox-master/src/anbox/common/wait_handle.cpp b/src/type3_AndroidCloud/anbox-master/src/anbox/common/wait_handle.cpp
new file mode 100644
index 0000000..0159816
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+++ b/src/type3_AndroidCloud/anbox-master/src/anbox/common/wait_handle.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright © 2012-2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authored by: Kevin DuBois <kevin.dubois@canonical.com>
+ *              Daniel van Vugt <daniel.van.vugt@canonical.com>
+ */
+
+#include "anbox/common/wait_handle.h"
+
+namespace anbox {
+namespace common {
+WaitHandle::WaitHandle()
+    : guard(), wait_condition(), expecting(0), received(0) {}
+
+WaitHandle::~WaitHandle() {}
+
+void WaitHandle::expect_result() {
+  std::lock_guard<std::mutex> lock(guard);
+
+  expecting++;
+}
+
+void WaitHandle::result_received() {
+  std::lock_guard<std::mutex> lock(guard);
+
+  received++;
+  wait_condition.notify_all();
+}
+
+void WaitHandle::wait_for_all()  // wait for all results you expect
+{
+  std::unique_lock<std::mutex> lock(guard);
+
+  wait_condition.wait(lock, [&] { return received == expecting; });
+
+  received = 0;
+  expecting = 0;
+}
+
+void WaitHandle::wait_for_pending(std::chrono::milliseconds limit) {
+  std::unique_lock<std::mutex> lock(guard);
+
+  wait_condition.wait_for(lock, limit, [&] { return received == expecting; });
+}
+
+void WaitHandle::wait_for_one()  // wait for any single result
+{
+  std::unique_lock<std::mutex> lock(guard);
+
+  wait_condition.wait(lock, [&] { return received != 0; });
+
+  --received;
+  --expecting;
+}
+
+bool WaitHandle::has_result() {
+  std::lock_guard<std::mutex> lock(guard);
+
+  return received > 0;
+}
+
+bool WaitHandle::is_pending() {
+  std::unique_lock<std::mutex> lock(guard);
+  return expecting > 0 && received != expecting;
+}
+}  // namespace common
+}  // namespace anbox