Thanks for your reply. Example, having timer subroutine as timerProducts($pdt) Calling like,

sub start(){
&timerProducts($pdt)
print "test one"
callpdt($pdt);
}
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Once called timerProducts, it should paralelly print the message "test one" and then call the subroutine callpdt. But it is not happened.It is executing only timerProducts. It is not allowed to run the callpdt subroutine.