1 #ifndef BENCHMARK_TIMERS_H
2 #define BENCHMARK_TIMERS_H
3 
4 #include <chrono>
5 #include <string>
6 
7 namespace benchmark {
8 
9 // Return the CPU usage of the current process
10 double ProcessCPUUsage();
11 
12 // Return the CPU usage of the children of the current process
13 double ChildrenCPUUsage();
14 
15 // Return the CPU usage of the current thread
16 double ThreadCPUUsage();
17 
18 #if defined(HAVE_STEADY_CLOCK)
19 template <bool HighResIsSteady = std::chrono::high_resolution_clock::is_steady>
20 struct ChooseSteadyClock {
21   typedef std::chrono::high_resolution_clock type;
22 };
23 
24 template <>
25 struct ChooseSteadyClock<false> {
26   typedef std::chrono::steady_clock type;
27 };
28 #endif
29 
30 struct ChooseClockType {
31 #if defined(HAVE_STEADY_CLOCK)
32   typedef ChooseSteadyClock<>::type type;
33 #else
34   typedef std::chrono::high_resolution_clock type;
35 #endif
36 };
37 
38 inline double ChronoClockNow() {
39   typedef ChooseClockType::type ClockType;
40   using FpSeconds = std::chrono::duration<double, std::chrono::seconds::period>;
41   return FpSeconds(ClockType::now().time_since_epoch()).count();
42 }
43 
44 std::string LocalDateTimeString();
45 
46 }  // end namespace benchmark
47 
48 #endif  // BENCHMARK_TIMERS_H
49