Exercise 16

submission/exercise-16/minjiJun/exercise-16.cpp

@@ -0,0 +1,76 @@
+#include <iostream>
+#include <thread>
+#include <atomic>
+#include <chrono>
+#include <mutex>
+
+int main() {
+
+    std::atomic<int> x1 = {0};
+
+    // Use std::atomic
+    auto time1 = std::chrono::steady_clock::now();
+
+    // 시간 측정
+    std::thread th1 = std::thread([&]() {
+        for (int i = 0; i < 100'000'000; i++) {
+            x1 += 1;
+        }
+    });
+    std::thread th2 = std::thread([&]() {
+        for (int i = 0; i < 100'000'000; i++) {
+            x1.fetch_add(1);
+        }
+    });
+
+    if (th1.joinable())
+        th1.join();
+
+    if (th2.joinable())
+        th2.join();
+
+    auto time2 = std::chrono::steady_clock::now();
+
+    auto interval1 = std::chrono::duration_cast<std::chrono::milliseconds>(time2 - time1);
+
+
+    std::cout << x1 << '\n';
+    std::cout << "걸린 시간: " << interval1.count() << "ms\n";
+
+    std::mutex mtx;
+    int x2 = 0;
+
+    auto time3 = std::chrono::steady_clock::now();
+
+    std::thread th3 = std::thread([&]() {
+        for (int i = 0; i < 100'000'000; i++) {
+            mtx.lock();
+            x2 += 1;
+            mtx.unlock();
+        }
+    });
+
+    std::thread th4 = std::thread([&]() {
+        for (int i = 0; i < 100'000'000; i++) {
+            mtx.lock();
+            x2 += 1;
+            mtx.unlock();
+        }
+    });
+
+    if (th3.joinable())
+        th3.join();
+
+    if (th4.joinable())
+        th4.join();
+
+    auto time4 = std::chrono::steady_clock::now();
+    auto interval2 = std::chrono::duration_cast<std::chrono::milliseconds>(time4 - time3);
+
+    // // do something
+
+    std::cout << x2 << '\n';
+    std::cout << "걸린 시간: " << interval2.count() << "ms\n";
+
+    return 0;
+}