[mapserver-users] Thread Safety

[kelly elton]

Ok so after trying this, I end up getting this error

msDrawMap(): Image handling error. Failed to draw layer named
'borders_lines10'.;msOGRFileNextShape(): OGR error. In GetNextRawFeature():
sqlite3_step() : database schema has changed;msOGRFileNextShape(): OGR
error. In GetNextRawFeature(): sqlite3_step() : database schema has
changed;msOGRFileNextShape(): OGR error. In GetNextRawFeature():
sqlite3_step() : database schema has changed;msOGRFileNextShape(): OGR
error. In GetNextRawFeature(): sqlite3_step() : database schema has
changed;msOGRFileNextShape(): OGR error. In GetNextRawFeature():
sqlite3_step() : database schema has changed

Thing is, we don't write to the database at all, not sure why it would
think the schema changed.

On Thu, Nov 5, 2015 at 5:43 PM kelly elton <its.the.doc at gmail.com> wrote:

> Yeah it's mapscript
>
> On Thu, Nov 5, 2015, 5:42 PM Lime, Steve D (MNIT) <Steve.Lime at state.mn.us>
> wrote:
>
>> Is this for MapScript? Should really let Tamas chime in. A single mapObj
>> instance is modified during the course of a request once ingested from the
>> mapfile. For example, it holds a populated label cache and other changes
>> made after it is loaded specific to a request. So I guess that means one
>> mapObj per thread.
>>
>>
>>
>> *From:* kelly elton [mailto:its.the.doc at gmail.com]
>> *Sent:* Thursday, November 05, 2015 4:35 PM
>> *To:* Lime, Steve D (MNIT) <Steve.Lime at state.mn.us>;
>> mapserver-users at lists.osgeo.org
>> *Subject:* Re: [mapserver-users] Thread Safety
>>
>>
>>
>> To be sure, are you saying I can use a single map object for multiple
>> threads, or will I need to have one map object per thread? What would you
>> suggest?
>>
>>
>>
>> On Thu, Nov 5, 2015 at 5:33 PM Lime, Steve D (MNIT) <
>> Steve.Lime at state.mn.us> wrote:
>>
>> You should be fine. I believe there are locks (mutex) around places where
>> this is known to be a problem. I’ve never heard user reports of issues in
>> this regard.
>>
>>
>>
>> Steve
>>
>>
>>
>> *From:* mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] *On
>> Behalf Of *kelly elton
>> *Sent:* Thursday, November 05, 2015 4:07 PM
>> *To:* mapserver-users at lists.osgeo.org
>> *Subject:* [mapserver-users] Thread Safety
>>
>>
>>
>> Say....if I have two processes using the mapserver dll, are they going to
>> conflict?
>>
>> I'm noticing on the website it says "OGR layers: use unsafe CPL
>> services"...In my map file I have 'CONNECTIONTYPE OGR'....what I do with
>> the map object is project, and then draw to png, and that's about
>> it....this isn't thread safe then? What about if I have multiple map
>> objects, one per thread....is that thread safe?
>>
>>
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