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I have created two threads, one each for addition and subtraction. I want them to run simultaneously, what are the possible ways for achieving concurrency?

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function onScriptLoad()
{
local coro1 = newthread(add);
local coro2 = newthread(sub);
local addition=coro1.call(0);
local subtraction=coro2.call(50);
local i=1;
do
 {
 print("suspend passed ("+addition+")\n");
 print("suspend passed ("+subtraction+")\n");
 if(coro1.getstatus()=="suspended")
 addition= coro1.wakeup("Addition started "+i);
 if(coro2.getstatus()=="suspended")
 subtraction= coro2.wakeup("Subtraction started "+i);
 ++i;
 }while(coro1.getstatus()=="suspended"||coro2.getstatus()=="suspended");
}
x <- 0;
y <- 50;
function add(x)
{
 while(x<50)
 {
 x=x+5;
 print(x);
 if(x==25)
 local ret = suspend("addition suspended");
 }
}

function sub(y)
{
while(y>0)
 {
 y=y-5;
 print(y);
 if(y==25)
 local ret = suspend("subtraction suspended");
 }
}


Help me to figure out how to generate a number or a vector every few seconds.  For example

1
// 2 sec delay
2
// 2 sec delay
3
// 2 sec delay

or

Vector( x, y, z) from database row 1
// 2 sec delay
Vector( x, y, z) from row 2
// 2 sec delay
Vector( x, y, z) from row 3
// so on


And how to create a delay function where after the time given by user the rest of the lines should execute. For Example

delay(time)
{

}

player.Health = 100;
delay(1000) // it should wait for 1 sec and then execute the next lines
print( Healed );
...

I am just learning from other scripts and snippets so please make sure to give me some example so that i can understand properly.