Re: Add pselect, ppoll system calls.

[Alan Cox]

On Gwe, 2005-06-10 at 23:58, David Woodhouse wrote:
> The idea of pselect is that if one wants to wait for an event, either a
> signal  or  something on a file descriptor, an atomic test is needed to
> prevent race conditions. (Suppose the signal handler sets a global flag
> and  returns.  Then  a  test  of this global flag followed by a call of
> select() could hang indefinitely if the signal arrived just  after  the
> test but just before the call. On the other hand, pselect allows one to

See sleep(), going back to oh V7 unix. It has this avoided nicely in
user space using setjmp (nowdays using sigsetjmp).

If glibc has a race why not just fix glibc ?

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