1#ifndef BENCHMARK_THREAD_MANAGER_H
2#define BENCHMARK_THREAD_MANAGER_H
3
4#include <atomic>
5
6#include "benchmark/benchmark.h"
7#include "mutex.h"
8
9namespace benchmark {
10namespace internal {
11
12class ThreadManager {
13 public:
14  explicit ThreadManager(int num_threads)
15      : alive_threads_(num_threads), start_stop_barrier_(num_threads) {}
16
17  Mutex& GetBenchmarkMutex() const RETURN_CAPABILITY(benchmark_mutex_) {
18    return benchmark_mutex_;
19  }
20
21  bool StartStopBarrier() EXCLUDES(end_cond_mutex_) {
22    return start_stop_barrier_.wait();
23  }
24
25  void NotifyThreadComplete() EXCLUDES(end_cond_mutex_) {
26    start_stop_barrier_.removeThread();
27    if (--alive_threads_ == 0) {
28      MutexLock lock(end_cond_mutex_);
29      end_condition_.notify_all();
30    }
31  }
32
33  void WaitForAllThreads() EXCLUDES(end_cond_mutex_) {
34    MutexLock lock(end_cond_mutex_);
35    end_condition_.wait(lock.native_handle(),
36                        [this]() { return alive_threads_ == 0; });
37  }
38
39  struct Result {
40    IterationCount iterations = 0;
41    double real_time_used = 0;
42    double cpu_time_used = 0;
43    double manual_time_used = 0;
44    int64_t complexity_n = 0;
45    std::string report_label_;
46    std::string skip_message_;
47    internal::Skipped skipped_ = internal::NotSkipped;
48    UserCounters counters;
49  };
50  GUARDED_BY(GetBenchmarkMutex()) Result results;
51
52 private:
53  mutable Mutex benchmark_mutex_;
54  std::atomic<int> alive_threads_;
55  Barrier start_stop_barrier_;
56  Mutex end_cond_mutex_;
57  Condition end_condition_;
58};
59
60}  // namespace internal
61}  // namespace benchmark
62
63#endif  // BENCHMARK_THREAD_MANAGER_H
64