gistfile1.txt

#include <nonius/main.h++>

#include <mutex>
#include <thread>
#include <condition_variable>

std::mutex m0;
std::condition_variable c0;

std::unique_lock<std::mutex> l0(m0);

NONIUS_BENCHMARK("no one waiting", []{ c0.notify_all(); })

std::mutex m1;
std::condition_variable c1;

std::unique_lock<std::mutex> l1(m1);

std::thread waiter([]{ while(true) { c1.wait(l1); } }); // Not entirely guaranteed to be always waiting :(

NONIUS_BENCHMARK("someone waiting", []{ c1.notify_all(); })