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[Libevent-users] re-entrant callbacks?

I am wondering how to protect global variables, such us pointers in a linked list, that are updated inside a callback and the possibility of re-entrant callbacks. In particular, I am dealing with chunked HTTP messages and the need inside a read callback to create other event buffers to initiate network I/O to POST to another server the chunks received. The application is single threaded.

Is there a real possibility for a single-threaded libevent application to re-enter a callback or is this something that in a single-threaded application will never happen?

Please advise.


-Marco G.