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The FD's tgid is refcounted and must be atomically manipulated. Function fd_grab_tgid() will increase the refcount but only if the tgid matches the one in argument (likely the current one). fd_claim_tgid() will be used to self-assign the tgid after waiting for its refcount to reach zero. fd_drop_tgid() will be used to drop a temporarily held tgid. All of these are needed to prevent an FD from being reassigned to another group, either when inspecting/modifying the running_mask, or when checking for updates, in order to be certain that the mask being seen corresponds to the desired group. Note that once at least one bit is set in the running mask of an active FD, it cannot be closed, thus not migrated, thus the reference does not need to be held long.
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)