Add OS challenges.

1 files changed, 33 insertions, 0 deletions

diff --git a/operating-system-challenge/1/main.cpp b/operating-system-challenge/1/main.cpp
new file mode 100644
index 0000000..0f780ef
--- /dev/null
+++ b/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;

+}