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  };
35
36 public:
37  static std::unique_ptr<Workload> CreateWorkload(const std::vector<std::string>& args);
38  static std::unique_ptr<Workload> CreateWorkload(const std::function<void ()>& function);
39
40  ~Workload();
41
42  bool Start();
43  bool IsStarted() {
44    return work_state_ == Started;
45  }
46  pid_t GetPid() {
47    return work_pid_;
48  }
49
50 private:
51  explicit Workload(const std::vector<std::string>& args,
52                    const std::function<void ()>& function)
53      : work_state_(NotYetCreateNewProcess),
54        child_proc_args_(args),
55        child_proc_function_(function),
56        work_pid_(-1),
57        start_signal_fd_(-1),
58        exec_child_fd_(-1) {
59  }
60
61  bool CreateNewProcess();
62  void ChildProcessFn(int start_signal_fd, int exec_child_fd);
63  bool WaitChildProcess(bool wait_forever, bool is_child_killed);
64
65  WorkState work_state_;
66  // The child process either executes child_proc_args or run child_proc_function.
67  std::vector<std::string> child_proc_args_;
68  std::function<void ()> child_proc_function_;
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