Breakpoints on a Specific Thread

You can have a breakpoint on a specific thread by filtering a regular breakpoint:

stop in foo -thread t@4

Where the t@4 refers to the thread with id 4.

When a thread hits a breakpoint, all threads stop. This is knows as "sympathetic stop," or "stop the world".

From the point of view of /proc and LWPs this is synchronous debugging.

To ease thread navigation, put this in your .dbxrc.

_cb_prompt() {
        if [ $mtfeatures = "true"]
        then
                PS1='[$thread $lwp]: '
        else
                PS1="(dbx-$proc) "
        fi
}