>>If asio is only issuing edge-triggered notifications, then libcurl will
only see state transitions on sockets, not continuations of the previous
state.

I've verified that the edge-triggered change in asio is the cause of the
hang. In event_cb in asiohiper.cpp, we call curl_multi_socket_action() only
once for each state transition. This worked fine when asio was
level-triggered. Now, however, we need to call curl_multi_socket_action()
repeatedly, until curl tells us that our socket has a new target state.

Besides explaining my hang, this probably explains the problem I reported
in my other post--the asio sample running very slowly. I'll confirm that as
well--and assuming the theory is confirmed after further testing, I'll post
a patch.

--Daniel

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Received on 2015-04-22