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For non yieldable lua handlers (converters, fetches or yield incompatible lua functions), current timeout detection relies on now_ms thread local variable. But within non-yieldable contexts, now_ms won't be updated if not by us (because we're momentarily stuck in lua context so we won't re-enter the polling loop, which is responsible for clock updates). To circumvent this, clock_update_date(0, 1) was manually performed right before now_ms is being read for the timeout checks. But this fails to work consistently, because if no other concurrent threads periodically run clock_update_global_date(), which do happen if we're the only active thread (nbthread=1 or low traffic), our clock_update_date() call won't reliably update our local now_ms variable Moreover, clock_update_date() is not the right tool for this anyway, as it was initially meant to be used from the polling context. Using it could have negative impact on other threads relying on now_ms to be stable. (because clock_update_date() performs global clock update from time to time) -> Introducing hlua multipurpose timer, which is internally based on now_cpu_time_fast() that provides per-thread consistent clock readings. Thanks to this new hlua timer API, hlua timeout logic is less error-prone and more robust. This allows the timeout detection to work as expected for both yieldable and non-yieldable lua handlers. This patch depends on commit "MINOR: clock: add now_cpu_time_fast() function" While this could theorically be backported to all stable versions, it is advisable to avoid backports unless we're confident enough since it could cause slight behavior changes (timing related) in existing setups. |
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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)