Re: [Valgrind-users] Re: [uml-devel] Re: UML and valgrind

[Jeff Dike <jdike@addtoit.com>]

On Wed, Aug 04, 2004 at 08:52:19AM +0100, Tom Hughes wrote:
> I don't see how a patch that small can have made clone work for you in
> any version - at the very least you would need a change to vg_syscall.c
> to stop it trapping the clone and complaining about it or you would
> never actually reach VG_(do_syscall).

There may have been more - this was the only bit that I spotted in my old
email.  In any case, that patch was the guts of the clone support.

> But how did you cope with the fact that valgrind doesn't protect it's
> internal data structures in any way? You would have all sorts of
> problems with two threads trying to access the same data.

Despite its use of clone, UML is essentially single-threaded.  The child
thread goes and does something, and the parent waits for it.  There is a 
window between the clone and wait where both could be executing at the
same time, and trashing valgrind data, but I never saw that happen.

				Jeff


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