I am working on a network printer spooler project. How to queue print requests ?

I am implementing a network spooler printer in C linux.

1. I would want to know how to queue different print requests coming from different clients to a multi threaded server and passing them onto a printer?
   
   for example pseudo code:
   thread1 is interacting with client1
   client 1 sends a file
   server creates a file and copies it their at its end
   server then queues the file path in a queue for processing by the printer
   client1 sends file1,server stores file1
   client1 sends file2,server stores file2
   
   queue: file1,file2
   Printer retrieves file1 and then file2 and then goes into wait state until a new arrives.
   Does the above make sense?linu
   
   
   
   
2. How to address each client individually from a multi-threaded server?

For example client[1], client[2] etc., How to assign ID's for each client?
Someone told me that you should use threadid as clientid, is this a right approach?
3.How to simulate a document being printed ?
Any help would be highly appreciated!

What this have something to do with CUPS Programming?
https://www.cups.org/documentation.p...-overview.html
https://www.cups.org/index.php