add 02 main IPC

main-02.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <queue>
+#include <mutex>
+#include <thread>
+#include <optional>
+
+using namespace std;
+
+std::mutex QUEUE_MUTEX;
+std::queue<int> INT_QUEUE;
+
+static uint32_t SENT_INTS = 0;
+
+void intSender() {
+    using namespace std::chrono_literals;
+    while(true) {
+        QUEUE_MUTEX.lock();
+        INT_QUEUE.push(++SENT_INTS);
+        QUEUE_MUTEX.unlock();
+        cout << "intSender: Sent value " << SENT_INTS << endl;
+        this_thread::sleep_for(1000ms);
+    }
+}
+
+void intReceiver() {
+    using namespace std::chrono_literals;
+    while(true) {
+        std::optional<int> optInt;
+        QUEUE_MUTEX.lock();
+        if(not INT_QUEUE.empty()) {
+            optInt = INT_QUEUE.back();
+            INT_QUEUE.pop();
+        }
+        QUEUE_MUTEX.unlock();
+        if (optInt.has_value()) {
+            cout << "intReceiver: Received integer value " <<
+                optInt.value() << endl;
+        }
+        this_thread::sleep_for(800ms);
+    }
+}
+int main() {
+    cout << "Hello World" << endl;
+    std::thread t0(intSender);
+    std::thread t1(intReceiver);
+    t0.join();
+    t1.join();
+}

ws-ipc/README.md

@@ -29,3 +29,5 @@ if you are completely new to concurrency in C++.
 C++ does not really have an built-in message queue implementation.
 We are going to use a `std::queue` in conjunction with a `std::mutex` to
 have something similar to a message queue API.
+
+##