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    foreach my $host (@{$hashRef->{hostArray}}){
        
...

    print "Just before Main Loop\n";
    SNMP::MainLoop();

trace: _callback_lock(): callback.c, 130:
9:callback:lock: locked (LIB,SESSION_INIT)
...
trace: snmpv3_build(): snmp_api.c, 2330:
snmp_build: Building SNMPv3 message (secName:"dcosnmpadmin", secLevel:
+noAuthNoPriv)...
<snip>

trace: _callback_lock(): callback.c, 130:
9:callback:lock: locked (LIB,SESSION_INIT)
...
trace: snmp_sess_select_info2(): snmp_api.c, 6188:
sess_select: for all sessions: 4 
sess_select: blocking:no session requests or alarms.

trace: _callback_unlock(): callback.c, 164:
9:callback:lock: unlocked (LIB,SESSION_INIT)
...
trace: snmp_sess_select_info2(): snmp_api.c, 6188:
sess_select: for all sessions: 4
sess_select: blocking:no session requests or alarms.