I have a function that calls some service and returns the response. If the response is FALSE, it waits 1 second to ask the service again (which then probably returns TRUE).

How can I do to call my function checkService() once, and get the real value? (the first or second try, decided by the function) I set the RET value inside the function, but the functions always return the first RET, because the setTimeout is asynchronous.

In other words, I need some sleep trick, or any solution (may be jQuery too).

function checkService() {



  //this may return TRUE or FALSE

  var RET = someServiceResponse(); 



  // here waits 1 second, then ask the service again

  if( RET == true ) {

    return true;

  } else {



    setTimeout(

        function() {

            //it must return the second response of the service

            RET = someServiceResponse();  

        }, 

        1000

    );



    // I want the checkService() return the response after de timeout

    return RET;  

  }

}



function alertResponse() {

    alert( checkService() );

}