Stop process simultaneously

zvivered · 10-15-2014, 10:51 AM

Hello,

My application contains 8 processes.
Using gdb I'm able to stop a specified process and debug it.

But because other processes continue running, the debugging does not give a clear picture of what happens without debugging.

Is it possible to stop all processes (in my application) simultaneously ?

Thank you in advance,
Zvika

linosaurusroot · 10-15-2014, 11:33 AM

If they are in a process group they could all be signalled with e.g. SIGTSTP at the same time. Then debug and SIGCONT the one you are interested in.
http://en.wikipedia.org/wiki/Process_group

I haven't tried ptrace() using a pid that means a process group.
http://linux.die.net/man/2/ptrace

Or there is other advice at http://www.delorie.com/gnu/docs/gdb/gdb_26.html

zvivered · 10-15-2014, 05:54 PM

Hello,

I manually launched 2 processes under the same group id.
Then using gdb I attached to one of the processes.

This stopped only one process.
I expected the other one to stop also.

Can you help ?

Thank you in advance,
Zvika