Question : Can a trigger tell it is already running

I want to trigger a stored procedure when rows are inserted to a table.  This is in a multi-user environment and it's ok if multiple users insert rows.  But i want the stored procedure to run to completion then restart if necessary.  So it should not be triggered if it's already running.  is it possible for a trigger or some other process to tell if it is still running?

Answer : Can a trigger tell it is already running

Here is the same question answered on EE but in reverse: http://www.experts-exchange.com/Security/Software_Firewalls/Enterprise_Firewalls/Cisco_PIX_Firewall/Q_23877617.html