AgentX sometimes blocks parallel UDP listener

Hi all,

I am currently using net-snmp V5.5 (CentOS 6.2, 32 bit).

I have programmed (in C++) a tool to
- provide data interface as SNMP AgentX (boost thread), by calling 
agent_check_and_process(1)
- listen to broadcast message on specific UDP port (boost io, boost thread)

I am running the tool as linux daemon.

Sometimes I've got a problem that at startup my tool does not receive the UDP 
broadcast messages (this seems to be only a startup problem).

If I disable the SNMP AgentX checking (do not call agent_check_and_process), 
everything is working all right and I receive the UDP broadcast message all 
the time.

I discovered that, if I first start the snmp AgentX thread before initializing 
and starting the UDP broadcast listener thread, the problem occurs frequently 
(e.g. 5 of 10 times). If I first initialize and start the UDP broadcast 
listener thread, the problem occurs less (but it occurs).

What can I do to overcome this problem?
Is there a configuration option or startup handling?

My SNMP AgentX configuration is (copied from NET-SNMP examples) shown below.

Thanks in advance and best regards,
Georg

--------------------------
	SnmpAgentX::SnmpAgentX()
	{
		int agentx_subagent=1;
		int background = 0;
		int syslog = 0;
		if (syslog)
			snmp_enable_calllog();
		else
			snmp_enable_stderrlog();

		if (agentx_subagent) {
			netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, 
NETSNMP_DS_AGENT_ROLE, 1);
		}

		if (background && netsnmp_daemonize(1, !syslog))
			exit(1);

		// SOCK_STARTUP; -> done in main()

		init_agent("SnmpAgentX");

		mib_handler_.MibHandlerInit();

		if (!agentx_subagent) {
			init_vacm_vars();
			init_usmUser();
		}

		init_snmp("SnmpAgentX");

		if (!agentx_subagent)
			init_master_agent();

		is_thread_running_ = true;
		thread_ = boost::shared_ptr<boost::thread> (new 
boost::thread(boost::bind(&SnmpAgentX::Thread, this)));
	}

	void SnmpAgentX::Thread()
	{
		while (is_thread_running_)
		{
			agent_check_and_process(1); // block to avoid risk of data loss 
and reduce cpu occupation
		}
	}



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