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 <android-base/thread_annotations.h> 21 #include <stdint.h> 22 #include <stdlib.h> 23 #include <string> 24 25 #include <condition_variable> 26 #include <mutex> 27 #include <thread> 28 29 namespace android { 30 31 class Worker { 32 public: Lock()33 void Lock() ACQUIRE(mutex_) { 34 mutex_.lock(); 35 } Unlock()36 void Unlock() RELEASE(mutex_) { 37 mutex_.unlock(); 38 } 39 Signal()40 void Signal() { 41 cond_.notify_all(); 42 } 43 void Exit(); 44 initialized()45 bool initialized() const { 46 return initialized_; 47 } 48 49 int InitWorker(); 50 51 protected: 52 Worker(const char *name, int priority, bool is_rt = false); 53 virtual ~Worker(); 54 55 virtual void Routine() = 0; 56 57 /* 58 * Must be called with the lock acquired. max_nanoseconds may be negative to 59 * indicate infinite timeout, otherwise it indicates the maximum time span to 60 * wait for a signal before returning. 61 * Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out 62 */ 63 int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1); 64 should_exit()65 bool should_exit() const { 66 return exit_; 67 } 68 69 std::mutex mutex_; 70 std::condition_variable cond_; 71 72 private: 73 void InternalRoutine(); 74 75 std::string name_; 76 int priority_; 77 78 std::unique_ptr<std::thread> thread_; 79 bool is_rt_; 80 bool exit_; 81 bool initialized_; 82 }; 83 } // namespace android 84 #endif 85