Re: CVS commit: pkgsrc/lang/python26

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

David Laight <david%l8s.co.uk@localhost> wrote:
>On Wed, Aug 15, 2012 at 09:02:58PM +0200, Matthias Drochner wrote:
>> 
>> On Wed, 15 Aug 2012 13:54:54 -0400
>> Greg Troxel <gdt%ir.bbn.com@localhost> wrote:
>> >   Log Message:
>> >   as with python27: avoid POSIX semaphores on NetBSD, this is broken
>> >   at least on -current
>> > 
>> > We've seen some flakiness that may be related to this (python26,
>> > netbsd-6 from late March, i386).  Does anyone understand what's wrong,
>> > and if any of the atf tests show it, and whether it's likely to be
>> > wrong on netbsd-6?
>> 
>> I've seen problems with ipython. It seems that there is something
>> in Python which closes all file descriptors >2 in a "for" loop,
>> probably in the course of an "exec"...
>
>That is quite common - even though the correct upper bound cannot
>be determined (the rlimit value can be lower than an open fd).
>It isn't clear that closeall() should affect them either.
>
>If semaphores are using fds I'd worry about:
>- use of low numbered fd, especially 0, 1 and 2 which can be closed.
>- programs can allocate a lot of semaphores, using 1 fd for each
>  will cause RLIMIT_NOFILE to be hit unexpectedly.
>- one fd per semaphore seems like a lot of kernel resource.
>
>Implementing them through a 'hidden' fd - I assume that is a separate
>number space - doesn't have these issues.

I have been playing with a Lisp system recently, it has a test suite
that is run after building that is failing on the semaphore tests with
a "Too many open files" error.

Robert Swindells