Re: gdb internal error SIGINT/SIGSTOP

[teawater <teawater@gmail.com>]

Sorry. I am not very clear your mean.

What I think is before you want send a sig to a inferior, you can use
a non-block wait or something like it to check if the inferior stop or
not.

If the inferior already stop by a breakpoint, this non-block wait will
success.  And then you don't need to send sig.

If the inferior is running, this wait will false, it will not affect
anything.  You can send sig after that.


Thanks,
Hui

On Tue, Feb 3, 2009 at 20:48, paawan oza <paawan1982@yahoo.com> wrote:
> Hello,
>
> your comments.
>> Why not check if this process is stop or not before send sig
>> to them
>> (use wait or something)?
>
> my anwser :
> It falls off in one situation.
>
> imagine :
> I send SIGINT/SIGSTOP to the process.
> and then just after I send the signal to the process to stop.
> gdb is scheeduled out.
> the inferior gets shceduled in.
> one of its threads already stopped because of breakpoint.
> and then we have no more control.
> now when gdb gets scheduled in, it ( linux-nat-wait) sees two signals. : )
> where it falls off.
>
> Regards,
> ..Paawan.
>
>
> --- On Tue, 2/3/09, teawater <teawater@gmail.com> wrote:
>
>> From: teawater <teawater@gmail.com>
>> Subject: Re: gdb internal error SIGINT/SIGSTOP
>> To: paawan1982@yahoo.com
>> Cc: gdb@sourceware.org
>> Date: Tuesday, February 3, 2009, 8:35 AM
>> Why not check if this process is stop or not before send sig
>> to them
>> (use wait or something)?
>>
>> On Mon, Feb 2, 2009 at 22:47, paawan oza
>> <paawan1982@yahoo.com> wrote:
>> >
>> > Hello,
>> >
>> > I have been modifying gdb for past couple of months.
>> > I am trying to keep process always running and user
>> should be able to type commands.
>> > It is similar to tracepoints but on host system.
>> >
>> > I am facing a problem as following when try to debug
>> multi-threaded applications.
>> >
>> > I am sending SIGINT/SIGSTOP (with no pass) to stop the
>> process.
>> > linux-nat-wait wll attempt to stop other threads and
>> it succeeds.
>> > and it works fine.
>> >
>> > but,
>> > when I have breakpoints on threads....
>> > and if main/CLONEs thread is stopped due to breakpoint
>> and if I send
>> > SIGINT/SIGSTOP to the main thread....
>> > eventually I end up getting interrnal gdb assertion
>> error.
>> > gdb_assert (pid == GET_LWP (lp->ptid));
>> >
>> > I would like to know !!
>> >
>> > 1) why is that happening ?
>> > in the scenerio where (thread is already stopped
>> because of breakpoint
>> > and I am internally sending SIGINT/SIGSTOP (with no
>> pass)
>> >
>> > note : I have modified gdb code to suite my
>> requirements. where process should always be running and
>> user should be able to type commands
>> >
>> > please do the needful.
>> >
>> >
>> > Regards,
>> > ..Paawan.
>> >
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