Duplicate a ColdFusion session so that Live On After Sign Out streams

I need to run certain blocks of ColdFusion code in a regular user session (for example: the user clicks print and I create the PDF). This web page is interactive and the user immediately receives a PDF file.

But I also need to run the same exact block of code many times in a loop (more than 1000 iterations). To do this, we will inform the user that an email will be sent to them when sent. I create <cfthread>with low priority and create the same code. The problem is that the executable code is heavily dependent on the variables in the session area. Therefore, if the user crashes, the error flows and dies when he enters the var session. As for the code in question, I know that I can change the variables so as not to use the session area, then the stream will not be a problem, but we will not be able to change this code. So, I tried to hack many years ago, which worked, I never felt good, and I was wondering if anyone could think of a better approach. This is the hack ...

<cfapplication name="backgroundThread" sessionTimeout="#CreateTimeSpan(0, 0, 600, 0)#" sessionManagement="Yes">

<!--- Duplicate the entire session structure --->
<cflock scope="session" timeout="30" type="Exclusive">
    <cfloop collection="#this.session#" item="session_element">
        <cfset new_session_element = evaluate("this.session." & "#session_element#")>
        <cfset "session.#session_element#" = new_session_element>
    </cfloop>
</cflock>

<cfthread action="run" priority="low" name="#this.threadid#" session=session>
  <!---
  Normal code can be included here and it will run.
  Even if the user who initiated the background process signs out.
  --->

, /, /. , , , , , .

. , . . <cfapplication>?

application.cfc->onSessionStart, , Adobe: , ColdFusion . , , .

24 2014 : , ( CF10)...

<cfthread action="run" name="testingSession" session="#session#" priority="LOW">
    <cfset form.session = session>  <!--- add this dirty trick --->
    <cftry>
        <cfloop from="1" to="200" index="i">
            <cfscript>sleep(3000);</cfscript>
            <cfquery name="q1" datasource="#session.sv.ds#">
                select sysdate thedate from dual
            </cfquery>
            <cflog file="threadTest6" text="thread running... #i# ... #q1.thedate#">
        </cfloop>
        <cfcatch type="any">
            <cflog file="threadTest6" text="error: #cfcatch.detail# /// #cfcatch.message#">
        </cfcatch>
    </cftry>
</cfthread>

, "". ...

<!---End session--->
<cfset StructDelete(Session, 'dev')>
<cfset StructDelete(Session, 'sv')>
<cfset StructDelete(Session, 'act')>
<cfset StructClear(Session)>
<!---I cannot use `<cfset sessionInvalidate()>` because not all our customers are up to CF10.--->

, , , , , . , . threadTest6.log...

"Severity","ThreadID","Date","Time","Application","Message"
"Information","cfthread-1","02/24/14","16:26:04",,"C:\ColdFusion10\cfusion\logs\threadTest6.log initialized"
"Information","cfthread-1","02/24/14","16:26:04","CMPRO","thread running... 1 ... 2014-02-24 16:26:04.0"
"Information","cfthread-1","02/24/14","16:26:07","CMPRO","thread running... 2 ... 2014-02-24 16:26:07.0"
"Information","cfthread-1","02/24/14","16:26:10","CMPRO","thread running... 3 ... 2014-02-24 16:26:10.0"
"Information","cfthread-1","02/24/14","16:26:13","CMPRO","thread running... 4 ... 2014-02-24 16:26:13.0"
"Information","cfthread-1","02/24/14","16:26:16","CMPRO","thread running... 5 ... 2014-02-24 16:26:16.0"
"Information","cfthread-1","02/24/14","16:26:19","CMPRO","thread running... 6 ... 2014-02-24 16:26:19.0"
"Information","cfthread-1","02/24/14","16:26:22","CMPRO","error: The value of the attribute datasource, which is currently '', is invalid. /// Attribute validation error for tag CFQUERY."