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Message-ID: <01fc01c17f74$0d774a20$0200a8c0@lifelesswks>
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Charles Wilson" <cwilson AT ece DOT gatech DOT edu>,
   "Jason Tishler" <jason AT tishler DOT net>
Cc: "Michael Hudson" <mwh AT python DOT net>, <david_abrahams AT users DOT sourceforge DOT net>,
   "Cygwin" <cygwin AT sources DOT redhat DOT com>
References: <20011206124426 DOT B1448 AT dothill DOT com> <3C0FB399 DOT 2020300 AT ece DOT gatech DOT edu>
Subject: Re: dll_list::load_after_fork() blues (was Re: [ python-Bugs-489709 ] Building Fails ...)
Date: Sat, 8 Dec 2001 10:08:14 +1100
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----- Original Message -----
From: "Charles Wilson" <cwilson AT ece DOT gatech DOT edu>
> > The above occurs during Cygwin's fork() when the Cygwin DLL cannot
> > load a DLL to the same address in the child that it had in the
parent.
> > I have seen this during Python 2.1.1 regression tests with threads
> > enabled.
>
>
> Part of the problem may be that cyggdbm.dll was built with
> --auto-image-base.  It was later demonstrated that this can cause
> problems with fork; you're better off just letting ld assign the
default
> dllbase, which means that EVERY process will remap the dll at runtime.
> Thus, no hardcoded conflicts.  Downside: *very* slightly delay in
> loading DLLs -- probably unnoticeable.
>
> (Did I get that right, robert?)

Yes. There is actually a longer term solution... which is to 'rebase'
every cygwin linked .dll on a particular system to not conflict with
each other - which has to be done by setup.exe.

Rob

> Anyway, I plan to redo cyggdbm "eventually" without the
> --auto-image-base.  Doing so *may* fix this problem, but I'm not
sure...
>
> --Chuck
>
>
>
>
>
>
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