*: adding a threaded worker example

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

account.h

@@ -1,4 +1,6 @@
 
+#ifndef ACCOUNT_H
+#define ACCOUNT_H
 /*
  * =====================================================================================
  *        Class:  Account
@@ -39,3 +41,4 @@ class Account
 
 }; /* -----  end of class Account  ----- */
 
+#endif

main.cpp

@@ -25,5 +25,9 @@ using namespace std;
 
 int main(int argc, char* argv[]) {
 	Account	account(0.0);
+	account.deposit(100.5); // Add some money
+	account.deposit(50.25); // Add more money
+	std::cout << "Current Balance: " << account.getBalance() << std::endl;
+
 	return EXIT_SUCCESS;
 }

meson.build

@@ -8,5 +8,9 @@ a = run_command('date', check: true)
 read_exe = executable('read', 'read.c', link_language : 'c',)
 readpp_exe = executable('read++', 'read++.cpp')
 
+worker_exe = executable('worker', 'worker.cpp')
+
 account_sources = ['main.cpp', 'account.cpp', 'account.h']
-account_exe = executable('account', account_sources)
+account_exe = executable('account', account_sources,
+  cpp_args: ['-std=c++23'],
+  )

worker.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <thread>
+#include <condition_variable>
+#include <mutex>
+
+// https://en.cppreference.com/w/cpp/thread/thread
+// https://en.cppreference.com/w/cpp/thread/mutex
+// https://en.cppreference.com/w/cpp/thread/condition_variable
+
+std::mutex mtx;
+std::condition_variable cv;
+bool ready = false;
+
+void worker() {
+    std::unique_lock<std::mutex> lock(mtx);
+    cv.wait(lock, [] { return ready; }); // Wait until 'ready' is set to true
+    std::cout << "Daemon process woke up!" << std::endl;
+}
+
+int main() {
+    std::thread daemon(worker);
+
+    std::this_thread::sleep_for(std::chrono::seconds(5));
+    {
+        std::lock_guard<std::mutex> lock(mtx);
+        ready = true;
+    }
+    cv.notify_one();
+
+    daemon.join();
+    return 0;
+}