1 /* 2 * Copyright (C) 2015-2016 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_WORKER_H_ 18 #define ANDROID_WORKER_H_ 19 20 #include <condition_variable> 21 #include <cstdint> 22 #include <cstdlib> 23 #include <mutex> 24 #include <string> 25 #include <thread> 26 27 namespace android { 28 29 class Worker { 30 public: Lock()31 void Lock() { 32 mutex_.lock(); 33 } Unlock()34 void Unlock() { 35 mutex_.unlock(); 36 } 37 Signal()38 void Signal() { 39 cond_.notify_all(); 40 } 41 void Exit(); 42 initialized()43 bool initialized() const { 44 return initialized_; 45 } 46 47 virtual ~Worker(); 48 49 protected: 50 Worker(const char *name, int priority); 51 52 int InitWorker(); 53 virtual void Routine() = 0; 54 55 /* 56 * Must be called with the lock acquired. max_nanoseconds may be negative to 57 * indicate infinite timeout, otherwise it indicates the maximum time span to 58 * wait for a signal before returning. 59 * Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out 60 */ 61 int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1); 62 should_exit()63 bool should_exit() const { 64 return exit_; 65 } 66 67 std::mutex mutex_; 68 std::condition_variable cond_; 69 70 private: 71 void InternalRoutine(); 72 73 std::string name_; 74 int priority_; 75 76 std::unique_ptr<std::thread> thread_; 77 bool exit_; 78 bool initialized_; 79 }; 80 } // namespace android 81 #endif 82