JavaScript how to call ajax function untill already run ajax not give a response? call ajax function from html,call ajax function on button

I want to call my ajax function untill already run ajax not give a response

Page is load on every sec and every sec ajax function call but i want to call ajax untill already run ajax function is not responde .

can i store ajax function refresh rate so that after this my function load ?

any solution ? please help me.

below are my code which i am using.

function realtime_content() {

var xmlhttp=false;
if (!xmlhttp && typeof XMLHttpRequest!='undefined')
    {
    xmlhttp = new XMLHttpRequest();
    }
if (xmlhttp) 
    {
    RTupdate_query = "RTajax=1&DB=" + DB + "" + groupQS + usergroupQS + "&adastats=" + adastats + "&SIPmonitorLINK=" + SIPmonitorLINK + "&IAXmonitorLINK=" + IAXmonitorLINK + "&usergroup=" + usergroup + "";

    xmlhttp.open('POST', 'demophp'); 
    xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8');
    xmlhttp.send(RTupdate_query); 
    xmlhttp.onreadystatechange = function() 
        { 
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) 
            {
            document.getElementById("realtime_content").innerHTML = xmlhttp.responseText;
            }
        }
    delete xmlhttp;
    }
}

This is page load function

function refresh_display()
{
if ($start_count < 1)
    {
    realtime_content();
    }
$start_count++;
if (ar_seconds > 0)
    {
    document.getElementById("refresh_countdown").innerHTML = "" + ar_seconds + "";
    ar_seconds = (ar_seconds - 1);
    setTimeout("refresh_display()",1000);
    }
else
    {
    document.getElementById("refresh_countdown").innerHTML = "0"
    realtime_content();
    setTimeout("refresh_display()",1000);
    }
}

I added an Image In this image page AST_timeonVDADall_final.php calling many times at page load and going in pending time.

So i want to resolve this pending time, if page is in pending no request go to on this page AST_timeonVDADall_final.php.

when pending resolved then this page AST_timeonVDADall_final.php call again.

enter image description here

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