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List:       net-snmp-coders
Subject:    Re: Multi-Thread Support
From:       Robert Story <rstory () freesnmp ! com>
Date:       2011-05-12 14:00:42
Message-ID: 20110512100042.41f1a866 () freesnmp ! com
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On Tue, 5 Apr 2011 14:02:46 -0400 Doug wrote:
DM> My main concern is that net-snmp not break when two threads are doing
DM> their own v3 things at the same time.
DM> 
DM> Ideally, I want two threads to talk to the same agent via different
DM> session pointers.  Essentially, each thread would do its own
DM> "snmp_sess_open" call, and it just so happens that they would each
DM> attempt to talk to the same IP address.
DM> 
DM> In *that* context, do you have any comments on the thread safety (in
DM> senses #2 and #3) of net-snmp?  Remember, at this point, our tool is
DM> using a mutex for *all* v3 calls, drastically reducing performance as
DM> v3 is used more.

As Wes already said, the issue (or one of them) is non-protected globals in
the snmpv3 code. So any use of v3, regardless of of how many sessions or hosts
are involved, is suspect.

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