adjust_pollset improvements #12640
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adjust_pollset improvements #12640
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- let `multi_getsock()` initialize the pollset in what the transfer state requires in regards to SEND/RECV - change connection filters `adjust_pollset()` implementation to react on the presence of POLLIN/-OUT in the pollset and no longer check CURL_WANT_SEND/CURL_WANT_RECV - cf-socket will no longer add POLLIN on its own - http2 and http/3 filters will only do adjustments if the passed pollset wants to POLLIN/OUT for the transfer on the socket. This is similar to the HTTP/2 proxy filter and works in stacked filters.
bagder
approved these changes
Jan 7, 2024
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There is the possibility in the existing implementation that for HTTP/2 the pollset adjustment could still lead to cpu busy loops. If HTTP/2 flow control blocks sending, the h2 filter would replace a POLLOUT in the pollset adjustment with a POLLIN. But the underlying cf-socket filter would still add a POLLOUT. A writeable socket would then lead to sends that are blocked in the HTTP/2 filters.
Fix:
multi_getsock()initialize the pollset in what the transfer state requires in regards to SEND/RECVadjust_pollset()implementation to react on the presence of POLLIN/-OUT in the pollset and no longer check CURL_WANT_SEND/CURL_WANT_RECV