[AGENT++] Lots of WARNING: Synchronized: recursive trylocking detected (id) messages

[MATTY, Steven]

Hi

I have recently updated from   agent++-3.5.31 / snmp++-3.2.25   to   agent++-4.0.2 / snmp++-3.3.4
I also now use agentx++ in order to connect with the OSPF MIB from quagga's ospfd subagent.

I've noticed that when viewing a MIB table (using iReasoning) there is a burst of warning messages :

WARNING: Synchronized: recursive trylocking detected (id)!:

The table is cleared/recreated every 5 seconds by a worker thread and checked that the table is not in the middle of being updated when viewing table contents within the MIB Browser
I've even tried removing lock_mib()/unlock_mib() and start_synch()/end_synch() calls when updating the table.

and also when doing repeated SNMP GET on an OID within our MIB (code generated by AgentX++ and not-modified)
in a short timespan I also get these warnings.

Are they expected, and if not, indicative of a locking/sync issue somewhere?

I've tried building our agent without threads but it appears AgentX++ requires threads enabled :

../include/agentx_pp/agentx++.h:33:2: error: #error AGENTPP_USE_THREAD_POOL must be defined in agent++.h of AGENT++ >= v3.5c
../include/agentx_pp/agentx_threads.h:28:2: error: #error "To use AgentX++ threads must be enabled in AGENT++"

(indeed it is not possible to build snmp++ if configured with -disable-threads :

/tmp/snmp++-3.3.4/include/snmp_pp/config_snmp_pp.h:79:5: error: #if with no expression

Regards


Steve



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