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Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in use
From: |
Daniel Jacobowitz |
Subject: |
Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2 |
Date: |
Tue, 2 Jun 2009 16:46:09 -0400 |
User-agent: |
Mutt/1.5.17 (2008-05-11) |
On Tue, Jun 02, 2009 at 09:08:14PM +0100, Paul Brook wrote:
> On Tuesday 02 June 2009, Nathan Froyd wrote:
> > When debugging multi-threaded programs, QEMU's gdb stub would report the
> > correct number of threads (the qfThreadInfo and qsThreadInfo packets).
> > However, the stub was unable to actually switch between threads (the T
> > packet), since it would report every thread except the first as being
> > dead. Furthermore, the stub relied upon cpu_index as a reliable means
> > of assigning IDs to the threads. This was a bad idea; if you have this
> > sequence of events:
> >
> > initial thread created
> > new thread #1
> > new thread #2
> > thread #1 exits
> > new thread #3
> >
> > thread #3 will have the same cpu_index as thread #1, which would confuse
> > GDB.
>
> Really? Why doesn't GDB get confused on real machines when the PID wraps?
It would, if using gdbserver and no one had done 'info threads' in between.
> Is the real bug that we're missing some sort of thread creation/destruction
> event reporting?
The remote protocol doesn't have creation/destruction events (yet;
it's a known limitation).
--
Daniel Jacobowitz
CodeSourcery
- [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2, Nathan Froyd, 2009/06/02
- Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2, Paul Brook, 2009/06/02
- Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2,
Daniel Jacobowitz <=
- Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2, Nathan Froyd, 2009/06/02
- Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2, Paul Brook, 2009/06/02
- Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2, Nathan Froyd, 2009/06/02
- Re: [Qemu-devel] [PATCH] fix gdbstub support for multiple threads in usermode, v2, Paul Brook, 2009/06/02
- [Qemu-devel] Re: [PATCH] fix gdbstub support for multiple threads in usermode, v2, Antti P Miettinen, 2009/06/16
- Re: [Qemu-devel] Re: [PATCH] fix gdbstub support for multiple threads in usermode, v2, Paul Brook, 2009/06/16
- [Qemu-devel] Re: [PATCH] fix gdbstub support for multiple threads in usermode, v2, Antti P Miettinen, 2009/06/16
- [Qemu-devel] Re: [PATCH] fix gdbstub support for multiple threads in usermode, v2, Jan Kiszka, 2009/06/17
- [Qemu-devel] Re: [PATCH] fix gdbstub support for multiple threads in usermode, v2, Jan Kiszka, 2009/06/02