[Twisted-Python] linux kernel 2.6.11-rc broke twisted process pipes

[Andrea Arcangeli]

On Mon, Feb 28, 2005 at 10:49:17PM -0500, James Y Knight wrote:
> 
> On Feb 28, 2005, at 10:40 PM, James Y Knight wrote:
> 
> >I'm glad we all agree as to what the new behavior should be, but 
> >you're incorrect about the extent of the old brokenness. Simple tests 
> >prove that POLLIN was not forced to be true always:
> 
> Which makes sense given that the following says "=" not "|=".
> -	mask = POLLIN | POLLRDNORM;
> -	if (PIPE_EMPTY(*inode))
> -		mask = POLLOUT | POLLWRNORM;

Ok that explains why you didn't get "r and w" set at the same time,
so it wasn't working by luck. It was only the 2.6.11-rc changes that
broke it and that could return "r and w" set at the same time.  And now
they're fixed again.