How to run some code in Unity3D after every x seconds? -

i need execute code every x seconds till condition met in unity3d c#. code should run irrespective of other code long condition true , stop otherwise. condition turns false, should stop executing , run again if condition becomes true (counting no. of seconds 0 again if possible). how that?

something should work.

void start(){     startcoroutine("dostuff", 2.0f); }  ienumerator dostuff(float waittime) {     while(true){         //...do stuff here         if(somestopflag==true)yield break;         else yield return new waitforseconds(waittime);     } }