1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_HARDWARE_HIDL_HAL_DEATH_HANDLER_H 18 #define ANDROID_HARDWARE_HIDL_HAL_DEATH_HANDLER_H 19 20 #include <functional> 21 #include <mutex> 22 #include <unordered_map> 23 24 #include <hidl/HidlSupport.h> 25 #include <utils/Singleton.h> 26 27 using android::hardware::hidl_death_recipient; 28 using android::hidl::base::V1_0::IBase; 29 30 namespace android { 31 32 class HalDeathHandler : public hidl_death_recipient, private Singleton<HalDeathHandler> { 33 public: 34 typedef std::function<void()> AtExitHandler; 35 36 // Note that the exit handler gets called using a thread from 37 // RPC threadpool, thus it needs to be thread-safe. 38 void registerAtExitHandler(void* cookie, AtExitHandler handler); 39 void unregisterAtExitHandler(void* cookie); 40 41 // hidl_death_recipient 42 virtual void serviceDied(uint64_t cookie, const wp<IBase>& who); 43 44 // Used both for (un)registering handlers, and for passing to 45 // '(un)linkToDeath'. 46 static sp<HalDeathHandler> getInstance(); 47 48 private: 49 friend class Singleton<HalDeathHandler>; 50 typedef std::unordered_map<void*, AtExitHandler> Handlers; 51 52 HalDeathHandler(); 53 virtual ~HalDeathHandler(); 54 55 sp<HalDeathHandler> mSelf; // Allows the singleton instance to live forever. 56 std::mutex mHandlersLock; 57 Handlers mHandlers; 58 }; 59 60 } // namespace android 61 62 #endif // ANDROID_HARDWARE_HIDL_HAL_DEATH_HANDLER_H 63