I have a server, after accept it is being created thread for a client, and i have problem here, when second client connects are happening strange things, packets which are send via server they are distorted, same with receiving, earlier i getting clear packets, and after connecting second client receiving packets they began to have strange characters.

Code:

..sock etc.

//bind
if(bind(server, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
	perror("Fail bind");
	exit(1);
}

std::cout << "=> Looking for clients..." << std::endl << std::endl;

std::vector <int> connection;
int clients = 0;

while( rc >= 0 )
{
	rc = listen( server, 50);
	if(  rc < 0)
	{
		perror("listen");
		close( server );
	}
	else
	{
		size = sizeof(client_addr);
		client = accept( server, ( struct sockaddr * ) & client_addr, & size );

		connection.push_back( client );
		std::thread th(show, connection, clients);

		threads.push_back(std::move(th));
		clients++;
	}
}

show(); - is a function that supports the game client, receives and sends packets all the time, works until the client disconnects.

Any idea how i can fix it?

When the player disconnects, his thread is closed via join();

I discovered that first and second client each other change their variables which, they use the same variables, How i can fix it?