List all Processes & Threads under processes from Linux core dump using gdb

I am developing a scripting tool for gdb/linux core dump, where if I point script to core bump , it lists all stack traces of all threads under process i.e, what I am trying to achieve is pretty much gdb equivalent of windbg's !process 0 which dumps all the processes and threads with stack from dump.I am developing a scripting tool for gdb/linux