Re: [patch 7/8] fdmap v2 - implement sys_socket2

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

> > and there's absolutely nothing wrong with this kind of setup, even if you 
> > could obviously have done it other ways too (ie by using "dup2()" instead 
> > of "close + open"),
> > 
> 
> This kind of setup was OK 25 years ago, before multithreading era.
> You cannot reasonably expect it to work in a multithreaded program.

Why not.

When execution begins which is the normal point you do this then you've
got one thread. If you need to do this from a thread after that point
posix provides threaded applications with locking.

Not much else works in a threaded app if you get the locking wrong, and
that is considered the authors job. Why is fd allocation different ?
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