This occurred in b18c8c8 (Thu May 17 2012).
This was a cause of very occasional race conditions and likely memory leakage as clients came and went from the region.
null would only ever be returned if the item couldn't be located within inventory and this would happen immediately.
In this case, derezzing wouldn't work anyway since there is no item to derez.
This is to take account of situations where the user was intending to specify a script engine using colon using its default language.
This probably generates few false positive as scripts are less likely to end a first line colon with a comment for other purposes.
This works by only posting the "Selected engine unavailable" message if we're falling back on XEngine and the language is one handled by XEngine.
In cases where the language is not handled or not allowed, the user will still be notified by the later compiler error.
This avoids the overwhelming majority of false positives where the first line contains a : for other reasons (e.g. source control systems, vim settings, etc.)
Ultimately, I think it would be better to detect script language/engine with a mechanism that didn't just rely on : detection (e.g like #! in unix scripts).
This matches behaviour in fatpack crossing, where attachments are cloned before their properties are changed.
This only applies to crossings to simulators running code released before April 2011.
If delete doesn't occur first then the update thread can outrace the IsAttachment = false necessary to save attachments and send hud artifacts to other viewers.
Serialization of attachments requires IsAttachment = false so that correct positions are serialized instead of avatar position.
However, doing this when a hud is still attached allows race conditions with update threads, resulting in hud artifacts on other viewers.
This change sets SOG.IsDeleted before serialization changes take place (IsDeleted itself is not a serialized property).
LLClientView then screens out any deleted SOGs before sending updates to viewers.
This involves three steps
1) Return gracefully in UrlModule.HttpRequestHandler() instead of throwing an exception when the url cannot be found in its index
2) Return true instead of false in HasEvents() if no matching request is found in the map. This call will only happen in the first place for raced requests.
3) Return a 404 in GetEvents() if the request is not in the index, rather than a blank 200 OK.
Many thanks to Tom Haines in http://opensimulator.org/mantis/view.php?id=6051 for doing some of the work on this.
This is to provide an indication of what's happening now that the default isn't to report every single script start.
Changes XEngine logging level in OpenSim.exe.config from WARN to INFO.
Previously, setting IsAttachment to false then true was necessary to serialize the updated attachment object information.
However, UpdateAttachmentPosition no longer does this update.
Whilst IsAttachment is set to false there is a race condition where the update thread can wrongly send hud object updates to clients that do not own the hud, resulting in screen artifacts.
It's a valid configuration not to have these modules, but I think it's still worth logging the fact that certain permissions won't work (always return true)
This is to reduce log spam from script loading, which is especially spammy for avatar movements with scripted attachments.
All important messages are at warn or above.
If you still want/need to see these messages, set <level value="DEBUG"/> in the <logger name="OpenSim.Region.ScriptEngine.XEngine"> section of OpenSim.exe.config.
This affects no other package logs, which still output at the root configured level (currently DEBUG by default).
Justin Clark-Casey (justincc)