b2c5e2a7cc
The latency object is used to simplify calculating latencies. It uses a start and stop time_point so the latency can be queried multiple time. The start need to be done explicitely and not in the constructor to allow reuse of the object. Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>
56 lines
1.0 KiB
C++
56 lines
1.0 KiB
C++
/*
|
|
* Copyright 2015 Cloudius Systems
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <chrono>
|
|
/**
|
|
* A helper class to keep track of latencies
|
|
*/
|
|
namespace utils {
|
|
|
|
class latency_counter {
|
|
public:
|
|
using time_point = std::chrono::system_clock::time_point;
|
|
using duration = std::chrono::system_clock::duration;
|
|
private:
|
|
time_point _start;
|
|
time_point _stop;
|
|
public:
|
|
void start() {
|
|
_start = now();
|
|
}
|
|
|
|
latency_counter& stop() {
|
|
_stop = now();
|
|
return *this;
|
|
}
|
|
|
|
bool is_stopped() const {
|
|
// if stop was not set, it is still zero
|
|
return _stop.time_since_epoch().count();
|
|
}
|
|
|
|
duration latency() const {
|
|
return _stop - _start;
|
|
}
|
|
|
|
latency_counter& check_and_stop() {
|
|
if (!is_stopped()) {
|
|
return stop();
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
int64_t latency_in_nano() const {
|
|
return std::chrono::duration_cast<std::chrono::nanoseconds>(latency()).count();
|
|
}
|
|
|
|
static time_point now() {
|
|
return std::chrono::system_clock::now();
|
|
}
|
|
};
|
|
|
|
}
|