Question

I attached to my multithread application with gdb and after that type cont to continue execution.

• Is there any way to stop execution at any time on cont gdb state and check what every thread do?
• How to check state of every thread and get execution line number of each? (commands)

Answer 1

Here’s what I do, (taken from here )

Create a little gdb script stackdumper.gdb that dumps the stack trace of all threads:

thread apply all backtrace

Then repeatedly attach gdb and run the dumper:

for i in $(seq 1 10) ; do
  gdb -batch -x stackdumper.gdb ./a.out 123456 > stack.$i
  sleep 10
done

where ./a.out is the binary you are interested and 123456 is the PID.

Adjust the sleep to match your sampling needs.