Daniel Fallmann wrote:
Hy!
We would like to invest some time to make the net-snmp lib threadsafe
and furthermore we would like to make the snmpd process requests
mutithreaded.
Although I'm working with your great lib for some months now, it would
nevertheless be a really good and helpfull thing to get a hint from you
where you would to start with this work.
Can you give me a list of interesting files (within the net-snmp tree)
that come to your mind and that should be at leased processed for this
task. As a startingpoint or something,...
Thank you very much!
Greetings to all,
Daniel
Hi, Daniel. Thank you for expressing an interest.
I'm personally very glad that you've offered to help, and I want you
to know that the Net-SNMP developers are more than happy to help
you succeed. Start with README.thread, then browse the bug reports.
I'll explain below.
Please know that it is particularly a sticky problem, as the
language and its support libraries make the project "interesting".
However, as I've discovered, it is well worth making the attempt.
If you have a "C" source code browser, or if you are handy making
and using "ctags" [I've used "cscope" with good results],
you will understand the scope of the problem in less time.
There is an old file README.thread which can give you background
on an early attempt to use UCD-SNMP in multi-threaded applications.
The issues described there are also raised in several bug reports.
Start with http://www.net-snmp.org/bugs/ Use the search window;
Here are a few of the bug reports which give good information
on thread-safe uses of net-snmp :
226228
839675
845846 s/b condensed into recommendation added to README.thread
811968 careful when you close an SNMP session
I recommend that you focus first on making the session and transport
functions thread-safe. In particular, snmp_sess_open has proven to
require external mutex before and after in order that the net-snmp
library works in multi-threaded applications. An example application
is "cactid" from the Cacti project.
The successful multi-threaded applications read all of their configuration
and all of their MIB files parsed BEFORE opening the first
SNMP session to an SNMP-capable device.
Once you have a handle on the problem set, review the source code.
There are some global objects marked with MTCRITICAL_RESOURCE comments.
Please keep all responses to [EMAIL PROTECTED]
for the benefit of everyone.
Thank you, and looking forward to working with you!
Sincerely,
-Mike Slifcak
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