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Since threads were introduced in 1.8, the USE_PRIVATE_CACHE mode of the shctx was not updated to use locks. Originally it was meant to disable sharing between processes, so it removes the lock/unlock instructions. But with threads enabled, it's not possible to work like this anymore. It's easy to see that once built with private cache and threads enabled, sending violent SSL traffic to the the process instantly makes it die. The HTTP cache is very likely affected as well. This patch addresses this by falling back to our native spinlocks when USE_PRIVATE_CACHE is used. In practice we could use them also for other modes and remove all older implementations, but this patch aims at keeping the changes very low and easy to backport. A new SHCTX_LOCK label was added to help with debugging, but OTHER_LOCK might be usable as well for backports. An even lighter approach for backports may consist in always declaring the lock (or reusing "waiters"), and calling pl_take_s() for the lock() and pl_drop_s() for the unlock() operation. This could even be used in all modes (process and threads), even when thread support is disabled. Subsequent patches will further clean up this area. This patch must be backported to all supported versions since 1.8.
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)