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Let's turn the buffer_wq into an array of 4 list heads. These are chosen by criticality. The DB_CRIT_TO_QUEUE() macro maps each criticality level into one of these 4 queues. The goal here clearly is to make it possible to wake up the most critical queues in priority in order to let some tasks finish their job and release buffers that others can use. In order to avoid having to look up all queues, a bit map indicates which queues are in use, which also allows to avoid looping in the most common case where queues are empty..
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)