User:ANSI Soderstrom/Threading with LSL
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All About : Threating with LSL (Creating Low-Lag-Items)
Some functions in SL creating a lot of lag on the server-side. But the greatest lag is not coming from llSetRot() or something like that, but from loops !!! Do->while and for->to->next loops are the greatest lagproducers at the beginners level in SL. Furthermore its impossible to trigger a Event while a loop is running.
Some people say, timers are the godlike-laggers, but now we learn how to use timers for the opposite :)
We try to rotate the Prim around a angle of 360 degrees and producing no lag, because we wait at every loop for free server-power and can handle events while the loop is running.
Timer Example <lsl> integer LOOP_COUNT; float THREATING_SPEED = 0.001; // 0.25 is nearby a NULL-Lag item !
default {
state_entry()
{
// use the timer event instead of a loop and make sure we can handle events while the loop is running...
LOOP_COUNT = 360;
llSetTimerEvent(THREATING_SPEED);
}
timer() {
// save serverPower
llSetTimerEvent(0);
// Do a loop (if possible)
if(LOOP_COUNT) {
// Rotate the Prim around his axis
llSetRot(llGetRot()*llEuler2Rot(<0,0,LOOP_COUNT>*DEG_TO_RAD));
// increment the loop
--LOOP_COUNT;
// look for events and do again the loop
llSetTimerEvent(THREATING_SPEED);
}
}
} </lsl>
Sensor Example <lsl> default {
state_entry()
{
llSensor("",NULL_KEY,AGENT,96,PI);
}
sensor(integer i) {
// do something...
// and AFTER that repeat the Sensor ! (DONT use SensorRepeat)
llSensor("",NULL_KEY,AGENT,96,PI);
}
} </lsl>
Multiple Timers in a single Script <lsl> // use more than one timer in a script // by ANSI Soderstrom
// holds the timers list timers = [];
// the timer itself, call it with his name and the order to stop or not after reaching the timer time(string name, integer stopafter) {
integer pos = llListFindList(timers,[name]);
if(~pos) {
if(!((integer)llGetTime()%llList2Integer(timers, pos+1))) {
llMessageLinked(llGetLinkNumber(),1,llList2String(timers,pos),"");
if(stopafter) {
timers = llDeleteSubList(timers, pos, pos+1);
}
}
}
}
// set a timer, give it a name and a time set_timer(string name, integer time) {
integer pos = llListFindList(timers,[name]);
if(~pos) {
timers = llListReplaceList(timers,[name, time],pos,pos+1);
} else {
timers += [name, time];
}
}
// start the timers start_timers() {
llResetTime(); llSetTimerEvent(1);
}
default {
state_entry()
{
set_timer("timer1",10);
set_timer("timer2",20);
start_timers();
}
timer() {
time("timer1",TRUE);
time("timer2",FALSE);
}
link_message(integer link_num, integer num, string str, key id) {
if(num == 1) {
if(str == "timer1") {
llOwnerSay("Doing this");
}
if(str == "timer2") {
set_timer("timer1",10);
llOwnerSay("and this");
}
}
}
} </lsl>