I've made a long-polling like a request in a function using jQuery ajax, which will run all the time. There is another request made to send data to PHP back-end file and this second request is not long-polling, it just sends data to that PHP file.
Problem: I examined with Firebug that when the long-polling request is running, I'm not able to send another request as long as the long-polling is running. How do I send another request even if the long-polling is running?
Note: I've used async: true in both.
another question: how do I make sure that even the function which holds long-polling request code will be called multiple times, but the long-polling request will be made only and only one?
Does your php use session based authentication? Your problem might be session locking. This can occur in PHP that uses session_start() unconditionally at the top of each request, and is sometimes default behavior in an MVC framework even if the session is never modified. Other suspect use cases is if both scripts depend on being logged in as an admin user.
If you suspect this might be the case, try strategic placement of session_write_close() at the earliest possible point after you no longer need to modify session data for your two scripts.