RE: [ZMapServer-Developers] mapserver/zmapserver - zope segfaults

[<Jea...@CC...>]

Michael,

The MapServer core is known not to be officially thread safe ... That =
is,
nobody has gone through the hole code base to make sure everything IS =
...
This issue also afflicts PHP/MapScript, which is why one needs to run =
PHP as
a cgi with mapserver right now ...

I've run into segfaults using python/mapscript even outside of zope =
myself,
running regular python scripts form the command line.  They are not =
easily
reproduced consistently however ... This was compiled on RH7.3 mind =
you,
don't know about windows.

I'm no good at debugging core dumps though ... Any one out there up to =
the
task ? Does windows produce an equivalent ?

My .02$ :)

J.F.

-----Original Message-----
From: Michael Schulz [mailto:ms...@we...]
Sent: Friday, September 05, 2003 3:44 AM
To: zmap-dev
Subject: [ZMapServer-Developers] mapserver/zmapserver - zope segfaults


Hi Sean,

when you are using zmapserver on your apple, do you experience =
segfaults=20
  of your zope server at all?

I am working on a windows based zmapserver application that with the=20
recent versions of mapscript/zmapserver (well, 4.0/0.7.4) keeps=20
segfaulting, but when i start the zope server with the option to only=20
use one thread (-t 1) then it is more stable.

Could it be that mapscript/zmapserver has problems with the threading=20
mechanisms of zope?

Another hint i am looking into, is that your demo application is =
working=20
without problems, so it also has to do with the application=20
implementation. And one difference could be different ways of calling=20
zmapserver instance calls, e.g. i used <dtml-with> tags rather =
frequent,=20
these seemed to cause problems, after removing them the application was =

more stable. Also, i am using full url's rather than relative one's.

I think this all has to do with the way new threads are being created,=20
and if that happens (perhaps in combination with the use of the=20
sessions) mapscript segfaults.

Cheers, Michael



--=20
-----------------------------------------------------------
Michael Schulz                                in medias res
Dipl.-Geologe                              Gesellschaft f=FCr
                                 Informationstechnologie mbH
                                      In den Weihermatten 66
		                             79108 Freiburg
                                      0761 55695-95 (Fax 96)
ms...@we...              www.webgis.de/www.zopecms.de



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