[ANNOUNCEMENT] Uploads for 12 August

[Ken Brown]

On 8/13/2013 2:26 PM, Corinna Vinschen wrote:
> On Aug 13 13:09, Yaakov (Cygwin/X) wrote:
>> On 2013-08-13 09:13, Ken Brown wrote:
>>> Yes.  The fix was to add the following for the Cygwin build, very early
>>> in main():
>>>
>>>    setenv ("G_SLICE", "always-malloc", 1);
>>>
>>> I don't know why this no longer works.  Maybe Glib now does its memory
>>> management initialization before emacs's main() is entered.
>>
>> Exactly; in glib-2.36, g_type_init has been moved to a ctor, which
>> is automatically called before main(); hence, this setenv is too
>> late now.  Mozilla software is also affected by this, see:
>>
>> https://bugzilla.gnome.org/show_bug.cgi?id=687763
>> https://bugzilla.mozilla.org/show_bug.cgi?id=833117
>>
>> and many others.  Firefox et al already use launcher scripts, so
>> adding one more line won't be a big deal for them.
>>
>>> Yaakov, is there any chance that you could patch Glib to do the
>>> equivalent of G_SLICE=always-malloc on Cygwin?  This isn't really an
>>> emacs issue.  It would affect any GTK application that provides its own
>>> malloc rather than using Cygwin's malloc.  (But emacs is probably the
>>> only such application in the distro.)
>>
>> Given that the only programs which seem to be *practically* affected
>> by this is our Emacs, and Firefox/Thunderbird/etc. (which we don't
>> have yet), and using G_SLICE=always-malloc apparently affects
>> performance, I don't think that would be an appropriate solution.
>>
>> For now, I think you'll have to add a wrapper script.
>
> Can anybody of you explain to me what the actual underlying problem is?
> I mean, why this error message:
>
>     ***MEMORY-ERROR***: [3044]: GSlice: failed to allocate 504 bytes
>     (alignment: 512): Function not implemented
>
> What function is not implemented?  Is that something we can fix,
> perhaps in the Cygwin DLL?

It's memalign, or at least that's what it was in 2007.  See

   http://cygwin.com/ml/cygwin/2007-02/msg00678.html

Ken


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