1 /* 2 * Copyright (C) 2015 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 <pthread.h> 21 #include <stdint.h> 22 #include <string> 23 24 namespace android { 25 26 class Worker { 27 public: 28 int Lock(); 29 int Unlock(); 30 31 // Must be called with the lock acquired 32 int SignalLocked(); 33 int ExitLocked(); 34 35 // Convenience versions of above, acquires the lock 36 int Signal(); 37 int Exit(); 38 39 protected: 40 Worker(const char *name, int priority); 41 virtual ~Worker(); 42 43 int InitWorker(); 44 45 bool initialized() const; 46 47 virtual void Routine() = 0; 48 49 /* 50 * Must be called with the lock acquired. max_nanoseconds may be negative to 51 * indicate infinite timeout, otherwise it indicates the maximum time span to 52 * wait for a signal before returning. 53 * Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out 54 */ 55 int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1); 56 57 private: 58 static void *InternalRoutine(void *worker); 59 60 // Must be called with the lock acquired 61 int SignalThreadLocked(bool exit); 62 63 std::string name_; 64 int priority_; 65 66 pthread_t thread_; 67 pthread_mutex_t lock_; 68 pthread_cond_t cond_; 69 70 bool exit_; 71 bool initialized_; 72 }; 73 } 74 75 #endif 76