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#include <iostream> | |
#include <chrono> | |
#include <atomic> | |
#include <cassert> | |
#include <mutex> | |
const int ITERATIONS = 10'000'000; | |
std::mutex mtx; | |
int state = 2; | |
std::atomic<int> atomic_state{2}; | |
void do_something(); | |
void mutex_bench() { | |
for (int i=0; i<ITERATIONS; i++) { | |
{ | |
std::lock_guard<std::mutex> guard(mtx); | |
assert(state == 2); | |
state = 1; | |
} | |
do_something(); | |
{ | |
std::lock_guard<std::mutex> guard(mtx); | |
assert(state == 1); | |
state = 2; | |
} | |
} | |
} | |
void atomic_bench() { | |
for (int i=0; i<ITERATIONS; i++) { | |
{ | |
int expected = 2; | |
atomic_state.compare_exchange_weak(expected, 1, std::memory_order_relaxed, std::memory_order_relaxed); | |
assert(expected == 2); | |
} | |
do_something(); | |
{ | |
int expected = 1; | |
atomic_state.compare_exchange_weak(expected, 2, std::memory_order_relaxed, std::memory_order_relaxed); | |
assert(expected == 1); | |
} | |
} | |
} | |
int main() { | |
auto start = std::chrono::steady_clock::now(); | |
mutex_bench(); | |
auto middle = std::chrono::steady_clock::now(); | |
atomic_bench(); | |
auto end = std::chrono::steady_clock::now(); | |
std::cout << "mutex: " << std::chrono::duration_cast<std::chrono::milliseconds>(middle - start).count() << "[ms]" << std::endl; | |
std::cout << "atomic: " << std::chrono::duration_cast<std::chrono::milliseconds> (end - middle).count() << "[ms]" << std::endl; | |
return 0; | |
} |
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