[Vm-dev] Stopping a Smalltalk process from lldb/gdb?

Ben Coman btc at openinworld.com
Tue Oct 4 12:43:30 UTC 2016

On Tue, Oct 4, 2016 at 3:38 PM, Holger Freyther <holger at freyther.de> wrote:
> with printCallStack() I can see it is running and activeProcess gives
> me the process. What I can't find is how to suspend/terminate that
> process. E.g. for the primtiveSuspend (or TerminateTo) I will need to
> prepare the call-stack.
> Is there a way I can terminate such a process from the debugger?

Interesting challenge.  I tried to replicate but in Linux Pharo 50760
doing "[[] repeat] fork"
doesn't even lock the UI.  So just some random guesses without being
able to test them...

Perhaps you don't need to kill it, just lower its priority so the UI
process takes precedence.
I see in VMMaker, StackInterpreter>>printProcessStack:
calls "self quickFetchInteger: PriorityIndex ofObject: proc"  (which
seems inlined)
which calls #integerValueOf:
for which the opposite seems to be #integerObjectOf: .

So maybe try tracing into printProcessStack() and once you have the
oop for the priority,
maybe push integerObjectOf(10) into it.

Or maybe try use #stObject:at:put
or #storeInteger:ofObject:withValue:

Another option may be putToSleepyieldingIf()

cheers -ben

More information about the Vm-dev mailing list