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 <functional>
23#include <string>
24#include <vector>
25
26#include <android-base/macros.h>
27
28class Workload {
29 private:
30  enum WorkState {
31    NotYetCreateNewProcess,
32    NotYetStartNewProcess,
33    Started,
34    Finished,
35  };
36
37 public:
38  static std::unique_ptr<Workload> CreateWorkload(const std::vector<std::string>& args);
39  static std::unique_ptr<Workload> CreateWorkload(const std::function<void ()>& function);
40  static bool RunCmd(const std::vector<std::string>& args, bool report_error = true);
41
42  ~Workload();
43
44  bool Start();
45  bool IsStarted() {
46    return work_state_ == Started;
47  }
48  pid_t GetPid() {
49    return work_pid_;
50  }
51
52  bool WaitChildProcess(int* exit_code);
53
54  // Set the function used to kill the workload process in ~Workload().
55  void SetKillFunction(const std::function<void (pid_t)>& kill_function) {
56    kill_function_ = kill_function;
57  }
58
59 private:
60  explicit Workload(const std::vector<std::string>& args, const std::function<void ()>& function);
61
62  bool CreateNewProcess();
63  void ChildProcessFn(int start_signal_fd, int exec_child_fd);
64  bool WaitChildProcess(bool wait_forever, bool is_child_killed, int* exit_code);
65
66  WorkState work_state_;
67  // The child process either executes child_proc_args or run child_proc_function.
68  std::vector<std::string> child_proc_args_;
69  std::function<void ()> child_proc_function_;
70  pid_t work_pid_;
71  int start_signal_fd_;  // The parent process writes 1 to start workload in the child process.
72  int exec_child_fd_;    // The child process writes 1 to notify that execvp() failed.
73  std::function<void (pid_t)> kill_function_;
74
75  DISALLOW_COPY_AND_ASSIGN(Workload);
76};
77
78#endif  // SIMPLE_PERF_WORKLOAD_H_
79