Recently while dealing with shutdown crashes related to plugins, I found a way to have individual threads process signals with their own signal handlers. After discussing with Alan, we agreed on that this might be too much freedom to open to people since signal handling is really tricky to do correctly, so we tuned it down to have only the ability to let threads listen to signals SIGTERM and SIGINT, and exit itself right there rather than having to make their own signal handler. The purpose of this is to let the threads created by plugins have the ability to just listen to the two signals mentioned above, and stop doing things and exit right away, this will speed up the shutdown process a lot.
I already have it working with the code here https://github.com/duke8253/trafficserver/pull/9.
