Re: gcore and nptl threads on linux

[Daniel Jacobowitz <drow@mvista.com>]

On Tue, Mar 04, 2003 at 06:40:51PM -0500, J. Johnston wrote:
> There is a problem with implementing gcore on linux with nptl thread
> support.  Under the linux nptl model, each thread is mapped to an
> lwpid which is distinct from the pid of the process that created the
> thread.
> 
> The current linux gcore code is merging the pid with the tid into an 
> unsigned
> long value.  This works ok in the old model because the tid and pids are 
> only
> 16-bits in length.  This no longer can work because tids in the nptl model 
> are actually
> addresses and are not restricted to 16-bits.

I think this used to cause problems, too - it really should be just the
lwpid, I'd think.  For these cases at least.

> This change would allow linux-proc.c to get the lwp where possible in a 
> cleaner
> fashion.
> 
> If nobody has any major objections to this proposal, I can post a patch 
> shortly.

What do you plan to do when there is not a mapping, i.e. in an M:N
environment?  This interface assumes 1:1.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer