Re: [PATCH] preventing resuming of threads in gdbserver

[Amit Kale <amitkale@linsyssoft.com>]

On Wednesday 11 Jan 2006 3:09 am, Daniel Jacobowitz wrote:
> On Tue, Jan 10, 2006 at 01:19:19PM -0800, Michael Snyder wrote:
> > Amit Kale wrote:
> > >Hi,
> > >
> > >gdb lets other threads continue execution during single stepping when
> > >doing a single step in remote mode. This behavior causes thread switches
> > >during step or next commands. Native mode behavior is opposite of it.
> > >Attached patch changes it and makes it similar to native mode.
> >
> > Actually, letting other threads continue during single stepping
> > is the norm.  It happens on almost all multi-thread gdb targets.
>
> Michael's right.  It sometimes does not obviously manifest on native
> targets, depending on the implementation of the native system's
> scheduler.

Yes I am convinced that it's just my setup that never shows a thread switch 
during a single step. It might occur in some setup.

> > On the other hand, there is a user-setable mode variable
> > called "scheduler-locking", which is meant to have the exact
> > effect you are looking for.  If you wanted to re-do your patch
> > so that it made this change conditionally, under the control of
> > that variable, it might be more acceptable.
>
> Take a look at the implementation of scheduler-locking; this should
> already work for gdbserver - and there's a testcase for it!

Right. schduler-locking works now.

Thanks.
-Amit