Fix foll-fork.exp foll-vfork.exp fork-child-threads.exp

[Daniel Jacobowitz]

On Mon, Dec 01, 2008 at 10:58:31AM -0800, Michael Snyder wrote:
> I'm not sure if this change goes far enough.
> If a multi-threaded program forks, only the currently
> executing thread survives in the child.  All others are
> left behind (and its not unlikely that the thread library
> is left in an inconsistant state, possibly leading to
> deadlocks).

If you use fork () rather than syscall (SYS_fork), the thread library
ought to clean up first; this is a POSIX supported functionality, I
believe.  I know it works with glibc and on Solaris.  Of course,
Solaris has rfork too which copies threads...

-- 
Daniel Jacobowitz
CodeSourcery