Is there a Callback feature in LSL?

Trying to work with the Loops system in LSL ins't exactly returning the desired effect im looking for.
Is there a callback type function one could use that executes a script once per frame?

Take for insance, in Flash Actionscript 2, we have:

var entryPoint = function() {
// this gets executed every single frame
}
this.onEnterFrame = entryPoint;


i also knwo the C++ equivalent but its not coming to mind right now.
If there doesn't exist one, how can i setup that loop function to run pretty much the same way?

Like for instance, say i wanted to make a disco ball continue rotating on its own and keeps going for forever. Using the looping method all i get is quick snaps of rotation executed every half second

Have you tried llTargetOmega to set a permanent rotation?

http://www.lslwiki.net/lslwiki/wakka.php?wakka=llTargetOmega
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well for the disco ball i would use llTargetOmega, it doesn't actually rotate the object as far as the sim/server is concerned, it just appears to rotate on the client's screen. actual continuous rotation, especially to make it look smooth would cause alot of lag

Oh, and no, there is no general callback function. However, LSL is event-driven, and if you can set up either a timer or other recurring event ... for example, a collision, or receipt of an IM or email ... you can get similar functionality. However, buyer beware: scheduling precision is not LSL's strong point.
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Alright thanks guys! this helps quite a bit actually