Single API and thread safety

Hello,

Our SNMP manager needs to monitor many snmp agents. The manage uses thread pool to get job done. I have read README.thread and user archives. I'm still not sure about how to use NetSnmp library so that our program is thread safe. Our current thinking is:

 1.  Use single mutex to control all activities associated with agents that need to use SNMP v3 protocol (we only have a few of those)
 2.  Have separate lock for each snmp agent so that MIB data queries to an agent will be synchronized but allow different threads query for different agents using SNMP v2 in parallel
 3.  Using Single API to open a session for each agent. Each session can be reused by different threads but not at the same time; one session can be used by at most one thread at any time.
Is this the proper way to use Single API session? Is above approach thread safe?

It is not clear to me if a session opened with Single API can only be used by the thread that opened it or can be used by other thread also but not at the same time.

Thanks a lot for your help in advance,
Xiangyang

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