So, as soon as I hit a breakpoint in some thread, is it possible to halt other threads until I continue?
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So, as soon as I hit a breakpoint in some thread, is it possible to halt other threads until I continue?
In all-stop mode (the only mode supported by currently released versions) GDB will stop all threads as soon as any thread stops (due to a breakpoint or a signal).
When you continue the stopped thread, all other threads will also continue, unless you do
set scheduler-locking on. Note that any ofstep,next, etc. continues current (and thus all other) thread (after setting a temporary breakpoint in appropriate place, e.g. on the next line fornextcommand).Perhaps you want to be able to single-step stopped thread without resuming all the other threads? In that case,
set scheduler-locking onis the answer.Beware: if another thread is holding a lock, you turn scheduler-locking on, and your current thread also requires the same lock, your program will wait indefinitely. This often comes up if one of the threads is inside malloc/realloc, and your current statement tries to allocate some memory.
Also don’t forget to
set scheduler-locking offbeforecontinue, otherwise only the current thread will make any forward progress.