Fix segfault from missing mutex lock

modernize/sockets.cpp

@@ -7,11 +7,15 @@
 constexpr auto max_buffer = 1024;
 decltype(net::message_queue) net::message_queue{};
 
+auto inline mutex() -> std::recursive_mutex&
+{
+    static std::recursive_mutex mutex{}; //allows for multiple thread access to our recv.
+    return mutex;
+}
 
 auto net::recv(const SOCKET socket) noexcept -> std::string
 {
-	static std::recursive_mutex mutex{}; //allows for multiple thread access to our recv.
-	std::unique_lock<std::recursive_mutex> lock(mutex);
+	std::unique_lock<std::recursive_mutex> lock(mutex());
 	try
 	{
 		auto& my_queue = message_queue[socket];
@@ -102,6 +106,7 @@ auto net::epilogue() noexcept -> void { WSACleanup(); }
 #else
 auto net::closesocket(const SOCKET socket) noexcept -> unsigned
 {
+    std::unique_lock<std::recursive_mutex> lock(mutex());
 	message_queue.erase(socket);
 	return close(socket);
 }

project/server.h

@@ -12,7 +12,7 @@ class server : networked
         {
             auto client = networked(accept(socket, nullptr, nullptr));
             client_connected.execute(client);
-#ifdef THREADED
+#ifndef THREADED
             std::thread(&server::accept_client_message, this, client).detach();
 #else
             std::thread(&server::accept_client_message, this, client).join();