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 SIMPLE_PERF_WORKLOAD_H_ 18 #define SIMPLE_PERF_WORKLOAD_H_ 19 20 #include <sys/types.h> 21 #include <chrono> 22 #include <string> 23 #include <vector> 24 25 #include <base/macros.h> 26 27 class Workload { 28 private: 29 enum WorkState { 30 NotYetCreateNewProcess, 31 NotYetStartNewProcess, 32 Started, 33 Finished, 34 }; 35 36 public: 37 static std::unique_ptr<Workload> CreateWorkload(const std::vector<std::string>& args); 38 39 ~Workload() { 40 if (start_signal_fd_ != -1) { 41 close(start_signal_fd_); 42 } 43 if (exec_child_fd_ != -1) { 44 close(exec_child_fd_); 45 } 46 } 47 48 bool Start(); 49 bool IsFinished(); 50 void WaitFinish(); 51 pid_t GetPid() { 52 return work_pid_; 53 } 54 55 private: 56 Workload(const std::vector<std::string>& args) 57 : work_state_(NotYetCreateNewProcess), 58 args_(args), 59 work_pid_(-1), 60 start_signal_fd_(-1), 61 exec_child_fd_(-1) { 62 } 63 64 bool CreateNewProcess(); 65 void WaitChildProcess(bool no_hang); 66 67 WorkState work_state_; 68 std::vector<std::string> args_; 69 pid_t work_pid_; 70 int start_signal_fd_; // The parent process writes 1 to start workload in the child process. 71 int exec_child_fd_; // The child process writes 1 to notify that execvp() failed. 72 73 DISALLOW_COPY_AND_ASSIGN(Workload); 74 }; 75 76 #endif // SIMPLE_PERF_WORKLOAD_H_ 77
