purpose of pipe in netsnmp_callback_send/recv functions

sarath azad <[email protected]>
Newsgroups gmane.network.net-snmp.devel,gmane.network.net-snmp.user
Message-ID <[email protected]>
Hello,
 
 
Is the pipe used in netsnmp_callback_send/recv function, is for synchronization purpose ? 
If yes, how is this approch better than other synchronisation methods like semaphores as we are storing one character for marking the push/pop from the queue?
 
 
Thanks and regards
S Sarath

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