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The receiver FDs must not be manipulated by the listener_accept() function anymore, it must exclusively rely on the job performed by its listeners, as it is also the only way to keep the receivers working for established connections regardless of the listener's state (typically for multiplexed protocols like QUIC). This used to be necessary when the FDs were adjusted at once only but now that fd_done() is gone and the need for polling enabled by the accept_conn() function which detects the EAGAIN, we have nothing to do there to fixup any possible previous bad decision anymore. Interestingly, as a side effect of making the code not depend on the FD anymore, it also removes the need for a second lock, which increase the accept rate by about 1% on 8 threads.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)