Semaphore / Synchronizing write operations

I created my agentX agent using the v5 handler-based API.

This agent will be use by many applications to populate a MIB tree.

To do this, the application must retrieve the last entry of a table, and with that number, perform some work and them populate the next entry.

 

My problem is: When two applications try to update de MIB at same time, it's possible that one application rewrite the data that other application just wrote.

 

How can I guarantee that two applications can't update the same node at the same time.

Can I implement a kind of semaphore or  implement a synchronization of write operation?

 

I presume that I can use a strategy like that, using the XXXTable_handler(netsnmp_mib_handler *handler,

                             netsnmp_handler_registration *reginfo,

                             netsnmp_agent_request_info *reqinfo,

                             netsnmp_request_info *requests) 

 

Any suggestion ?

 

Thanks in advance!

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