Debugging Postgresql 9.3 with Eclipse CDT and GDB

Hi,
I need some help with attaching debugger to postgresql .

i am from java background and have used debugger in eclipse(java).

i have installed postgresql 9.3 as stated in this link:
https://wiki.postgresql.org/wiki/Working_with_Eclipse

The debugger works fine for the server(which waits and accepts incoming
client connections).

1. When i connect a client with: **$ psql test** .Does the server create a
new thread for the client?

2. Is it possible to attach debugger and set breakpoints in parser.c or
executor.c in postgresql source files so that i can analyse how postgresql
queries are executed?

I have tried attaching debugger and set breakpoints in parser.c and
executed some queries in the client.But it doesnt stop at the breakpoint.

Thanks in Advance

with regards,
Venkateshwaran S