gdb-gud-control-all-threads

gdb-gud-control-all-threads is a variable defined in `gdb-mi.el'.
Its value is

t

Documentation:
When non-nil, GUD execution commands affect all threads when
in non-stop mode. Otherwise, only current thread is affected.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.2 of Emacs.