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There's a nasty case during boot, which is the master process. It stops all listeners from the main thread, and as such we're seeing calls to fd_delete() from a thread that doesn't match the FD's mask, but more importantly from a group that doesn't match either. Fortunately this happens in a process that doesn't see the threads creation, so the FDs are left intact in the table and we can overwrite the tgid there. The approach is ugly, it probably shows that we should use a dummy value for the tgid during boot, that would be replaced once the FDs migrate to their target, but we also need a way to make sure not to miss them. Also that doesn't solve the possibility of closing a listener at run time from the wrong thread group.
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)