On Tue, 2009-01-27 at 16:45 -0500, Matthew Mondor wrote:
I've been trying to use the multiplexer and am ambiguous as to two things:
event-base appears to be a class which the user must instanciate. I assume that this is to allow extending the class to allow using user data like kqueue does via the udata to have those passed around to event handlers?
No, it's to allow using more event queues in multiple threads. On a SMP machine, you could have two separate threads managing ports 80 and 443(https) each one with its own event loop.
If so, it's interesting that the event handler functions do not get this object passed along, and that a custom lambda function should pass it to another level of custom handler functions.
All you get is that you give the event loop a closure to be invoked when a certain event - a tuple (fd,type) - is received. If you want to have private data per handler, close the handler around it: that's what closures are for.
The event handler functions are provided an fd rather than a socket. Is there an easy provided way to obtain the associated socket from an fd, or must a custom index or hash table be used for this?
You need to make a custom map from FDs to sockets.
The event loop is a very low-level mechanism which is quite flexible precisely because of that: you can build more sophisticated and more specific mechanisms on top of it. Some use it as a normal event loop, others have built green threads with it. The choice is yours.