Extracting thread information from core dump using gdb/anytool

I have a coredump of my simple application crash. I am using gdb to analyze crash.

I am trying to find out all information like signal which cause crash, thread information of system . Can any one tell me how to get thread information from the coredump using gdb or any other recommended tool.

It will be of great help...
Thanks

Start with:

(gdb) info threads

and read throughly the section 4.10 "Debugging Programs with Multiple Threads" in the gdb's manual.