Run Tracking, Local Mapping, and Loop Closure on a single thread

Hi, I am wondering if anyone has any input on running the three modules on a single thread. I basically want to disable the wait/stop/interrupt sequences that occur due to a thread being busy. So, I want to test out the whole process running on a single thread sequentially. 
If anyone has tried anything like this, would love to get some input on issues to watch out for. Thanks! 