wifi(implementation): Add global lock
Add a global lock to address synchronization issues between the main
HIDL method servicing thread and the legacy HAL's event loop thread.
Also, added some documentation for the threading model used.
Bug: 34261034
Test: Compiles
Change-Id: I881111814ff5ebd601d6a4c85cf284b30ae47ed3
diff --git a/wifi/1.0/default/hidl_sync_util.h b/wifi/1.0/default/hidl_sync_util.h
new file mode 100644
index 0000000..6631e55
--- /dev/null
+++ b/wifi/1.0/default/hidl_sync_util.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef HIDL_SYNC_UTIL_H_
+#define HIDL_SYNC_UTIL_H_
+
+#include <mutex>
+
+// Utility that provides a global lock to synchronize access between
+// the HIDL thread and the legacy HAL's event loop.
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_0 {
+namespace implementation {
+namespace hidl_sync_util {
+std::unique_lock<std::recursive_mutex> acquireGlobalLock();
+} // namespace hidl_sync_util
+} // namespace implementation
+} // namespace V1_0
+} // namespace wifi
+} // namespace hardware
+} // namespace android
+#endif // HIDL_SYNC_UTIL_H_