From ec72d12002c6d3b707a014645c0da1b397dc7ee4 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 17 Mar 2021 17:15:19 +0800
Subject: import(life): Add OS challenges.

---
 works/life/operating-system-challenge/1/main.cpp | 33 ++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 works/life/operating-system-challenge/1/main.cpp

(limited to 'works/life/operating-system-challenge/1/main.cpp')

diff --git a/works/life/operating-system-challenge/1/main.cpp b/works/life/operating-system-challenge/1/main.cpp
new file mode 100644
index 0000000..0f780ef
--- /dev/null
+++ b/works/life/operating-system-challenge/1/main.cpp
@@ -0,0 +1,33 @@
+// Remember not to use O2 optimization!
+
+#include <thread>
+#include <vector>
+
+int main() {
+  std::vector<std::thread> threads;
+
+  // Because my CPU has 4-core and 8-threads. I open 8 threads.
+  for (int i = 0; i < 8; i++) {
+    std::thread t([] {
+      int i;
+      int j;
+      int k;
+      double d;
+      while (true) {
+        i = i + i;
+        j = j - j;
+        k = k * k;
+        d = d + d;
+        i = i & i;
+        j = j | j;
+      }
+    });
+    threads.push_back(std::move(t));
+  }
+
+  for (auto &t : threads) {
+    t.join();
+  }
+
+  return 0;
+}
-- 
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