XEngine

The XEngine Script Engine

This is a fully functional, full featured script engine which supports persistent script states and script state serialization.

This engine is not enaled by default. To enable it, add the following line to your OpenSim.ini [Startup] section:

script_engine = "OpenSim.Region.ScriptEngine.XEngine.dll"

At this time, you can delete the compiled scripts from your ScriptEngines directory, because the XEngine uses a different binary format.

The XEngine will create up to 4 files for each script, these are:

.dll, the actual executable file
.mdb, the debug info, if requested
.state, the saved state
.cs, the converted source file, if requested

The XEngine has a number of configuration options in OpenSim.ini, which are listed below, with an explanation and the default values:

[XEngine]

; How many threads to keep alive even if nothing is happening
MinThreads = 2
   XEngine will keep at least this many threads waiting

; How many threads to start at maximum load
MaxThreads = 100
   XEngine will not start more than this many scripts, even if that means blocking script execution

; Time a thread must be idle (in seconds) before it dies
IdleTimeout = 60
   Threads will die when they are not used for a while. This is the amount of time they must be'
   idle for that to happen

; Thread priority ("Lowest", "BelowNormal", "Normal", "AboveNormal", "Highest")
Priority = "BelowNormal"
   Script threads will run at this priority

; Maximum number of events to queue for a script (excluding timers)
MaxScriptEventQueue = 300
   Each script has a queue for events. This is the length of the queue, determining the number of
   events that will be queued up before events are dropped

; Stack size per thread created
ThreadStackSize = 262144
   The stack size each script thread runs with. The default also represents the minimum

; Rate to poll for asynchronous command replies (ms)
AsyncLLCommandLoopms = 50
   Interval between polls for asynchronous command results. Smaller values mean better response, but
   also more burned CPU cycles

; Save the source of all compiled scripts
WriteScriptSourceToDebugFile = false
   Create a source file (.cs) on ScriptEngines, containing the preprocessed script

; Default language for scripts
DefaultCompileLanguage = lsl
   The default language to compile

; List of allowed languages (lsl,vb,js,cs)
AllowedCompilers = lsl,vb,js,cs
   The languages to allow for compiling

; Compile debug info (line numbers) into the script assemblies
CompileWithDebugInformation = true
   Create the .mdb debug file, which allows reporting of line numbers in runtime errors

; Allow the use of os* functions (some are dangerous)
AllowOSFunctions = false
   Allow the use if functions in the os* namespace

; Interval (s) between background save of script states
SaveInterval = 120
   Interval for script state persistence save.

; Interval (s) between maintenance runs (0 = disable)
MaintenanceInterval = 10
   Interval in seconds between maintenance runs. The maintenance run checks for long
   running script events and terminates the scripts

; Time a script can spend in an event handler before it is interrupted
EventLimit = 30
   If a script spends more time in a single event handler, it will be interrupted.
   This includes delays produced by llSleep() calls

; If a script overruns it's event limit, kill the script?
KillTimedOutScripts = false
   If a script gets terminated by the above timeout, suspend it pending a recompile?

; Allow OS console command functionality (VERY DANGEROUS!!)
AllowosConsoleCommand = false
   Allow the use of the os console command function, which allows running any opensim
   command from within a script

The LSL implementations of the XEngine differ from those of the standard engine. the XEngine is more LSL compliant in it's event handling.