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We used to call ->wake() for any I/O event for which there was no subscriber. But this is a problem because this causes massive wake() storms since we disabled fd_stop_recv() to save syscalls. The only reason for the io_available condition is to detect that an asynchronous connect() just finished and will not be handled by any registered event handler. Since we now properly handle synchronous connects, we can detect this situation by the fact that we had a success on conn_fd_check() and no requested I/O took over.
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)