1. atomic과 mutex 차이
#include <atomic>
#include <iostream>
#include <ppl.h>
#include <Windows.h>
#pragma comment(lib, "Winmm.lib")
std::atomic<int> bIsWrite = 0;
//int b = 1;
//lock
auto time = timeGetTime();
Concurrency::parallel_for(0, 100000, [&](int i) {
i;
int a = 0;
if (bIsWrite.compare_exchange_weak(a, 1))
{
std::cout << std::endl;
}
});
std::cout << timeGetTime() - time << std::endl;
//thread
std::recursive_mutex m_kMutex;
bool bRead = false;
time = timeGetTime();
Concurrency::parallel_for(0, 100000, [&](int i) {
i;
std::lock_guard<std::recursive_mutex>kLock(m_kMutex);
if (bRead == false)
{
bRead = true;
std::cout << std::endl;
}
});
std::cout << timeGetTime() - time << std::endl;
결과
15
50
