Can't send trap from a running sub-agent.

I have a sub-agent running as a thread.
If I want to send a trap (using send_v2trap), I have to interupt the
sub-agents agent_check_and_process() in order to send the trap.
 
Is there some event mechanism in net-snmp to allow to interupt the
sub-agent?
 
Thanks,
erez.