1 files changed, 68 insertions, 0 deletions
diff --git a/store/works/life/operating-system-challenge/3/main.cpp b/store/works/life/operating-system-challenge/3/main.cpp
new file mode 100644
index 0000000..461c775
--- /dev/null
+++ b/store/works/life/operating-system-challenge/3/main.cpp
@@ -0,0 +1,68 @@
+#include <iostream>
+#include <mutex>
+#include <thread>
+
+int main() {
+  int turn = 1;
+  int count = 0;
+  std::mutex mutex;
+
+  auto thread_proc1 = [&] {
+    while (true) {
+      {
+        std::lock_guard<std::mutex> guard(mutex);
+        if (count >= 10)
+          break;
+        if (turn == 1) {
+          std::cout << "A" << std::endl;
+          turn = 2;
+        }
+      }
+
+      std::this_thread::yield();
+    }
+  };
+
+  auto thread_proc2 = [&] {
+    while (true) {
+      {
+        std::lock_guard<std::mutex> guard(mutex);
+        if (count >= 10)
+          break;
+        if (turn == 2) {
+          std::cout << "B" << std::endl;
+          turn = 3;
+        }
+      }
+
+      std::this_thread::yield();
+    }
+  };
+
+  auto thread_proc3 = [&] {
+    while (true) {
+      {
+        std::lock_guard<std::mutex> guard(mutex);
+        if (count >= 10)
+          break;
+        if (turn == 3) {
+          std::cout << "C" << std::endl;
+          turn = 1;
+          count++;
+        }
+      }
+
+      std::this_thread::yield();
+    }
+  };
+
+  std::thread thread1(thread_proc1);
+  std::thread thread2(thread_proc2);
+  std::thread thread3(thread_proc3);
+
+  thread1.join();
+  thread2.join();
+  thread3.join();
+
+  return 0;
+}