| /* |
| * 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 LOCK_WATCH_H |
| #define LOCK_WATCH_H |
| |
| #include <utils/String8.h> |
| #include <utils/Thread.h> |
| |
| namespace android { |
| |
| // periodically checks if a mutex can be acquired and kill process otherwise |
| class LockWatch : public Thread { |
| |
| public: |
| static const uint32_t DEFAULT_PERIOD_MS = 10000; // 10 seconds default check period |
| static const uint32_t DEFAULT_TIMEOUT_MS = 3000; // 3 seconds default lock timeout |
| |
| LockWatch(Mutex& lock, const String8& tag = String8(""), |
| uint32_t periodMs = DEFAULT_PERIOD_MS, uint32_t timeoutMs = DEFAULT_TIMEOUT_MS) |
| : Thread(false /*canCallJava*/), |
| mLock(lock), mTag(tag), mPeriodMs(periodMs), mTimeOutMs(timeoutMs) {} |
| |
| virtual ~LockWatch() { } |
| |
| // RefBase |
| virtual void onFirstRef(); |
| |
| private: |
| // Thread |
| virtual bool threadLoop(); |
| |
| Mutex& mLock; // monitored mutex |
| String8 mTag; // tag |
| uint32_t mPeriodMs; // check period in milliseconds |
| uint32_t mTimeOutMs; // mutex lock timeout in milliseconds |
| }; |
| |
| } // namespace android |
| |
| #endif // LOCK_WATCH_H |