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This function doesn't need to be write-locked. It performs a lookup of the next update at its index, atomically updates the ref_cnt on the stksess, updates some shared_table fields on the local thread, and updates the table's commitupdate. Now that this update is atomic we don't need to keep the write lock during that period. In addition this function's callers do not rely on the write lock to be held either since it was droped during peer_send_updatemsg() anyway. Now, when the function is entered with a write lock, it's downgraded to a read lock, otherwise a read lock is grabbed. Updates are looked up under the read lock and the message is sent without the lock. The commitupdate is still performed under the read lock (so as not to break the code too much), and the write lock is re-acquired when leaving if needed. This allows multiple peers to look up updates in parallel and to avoid stalling stick-table lookups.
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)