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The hathreads.h file has quickly become a total mess because it contains thread definitions, atomic operations and locking operations, all this for multiple combinations of threads, debugging and architectures, and all this done with random ordering! This first patch extracts all the atomic ops code from hathreads.h to move it to haproxy/atomic.h. The code there still contains several sections based on non-thread vs thread, and GCC versions in the latter case. Each section was arranged in the exact same order to ease finding. The redundant HA_BARRIER() which was the same as __ha_compiler_barrier() was dropped in favor of the latter which follows the naming convention of all other barriers. It was only used in freq_ctr.c which was updated. Additionally, __ha_compiler_barrier() was defined inconditionally but used only for thread-related operations, so it was made thread-only like HA_BARRIER() used to be. We'd still need to have two types of compiler barriers, one for the general case (e.g. signals) and another one for concurrency, but this was not addressed here. Some comments were added at the beginning of each section to inform about the use case and warn about the traps to avoid. Some files which continue to include hathreads.h solely for atomic ops should now be updated.
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)