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Since our locks are based on progressive locks, we support the upgradable seek lock that is compatible with readers and upgradable to a write lock. The main purpose is to take it while seeking down a tree for modification while other threads may seek the same tree for an input (e.g. compute the next event date). The newly supported operations are: HA_RWLOCK_SKLOCK(lbl,l) pl_take_s(l) /* N --> S */ HA_RWLOCK_SKTOWR(lbl,l) pl_stow(l) /* S --> W */ HA_RWLOCK_WRTOSK(lbl,l) pl_wtos(l) /* W --> S */ HA_RWLOCK_SKTORD(lbl,l) pl_stor(l) /* S --> R */ HA_RWLOCK_WRTORD(lbl,l) pl_wtor(l) /* W --> R */ HA_RWLOCK_SKUNLOCK(lbl,l) pl_drop_s(l) /* S --> N */ HA_RWLOCK_TRYSKLOCK(lbl,l) (!pl_try_s(l)) /* N -?> S */ HA_RWLOCK_TRYRDTOSK(lbl,l) (!pl_try_rtos(l)) /* R -?> S */ Existing code paths are left unaffected so this patch doesn't affect any running code.
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)