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HAProxy - Load balancer
1a2cdf64c9
When ha_panic() is called by the watchdog, we try to guess from ha_task_dump() and ha_thread_dump_one() if the thread was stuck while executing lua from the stream context. However we consider this is the case by simply checking if the stream hlua context was set, but this is not very precise because if the hlua context is set, then it simply means that at least one lua instruction was executed at the stream level, not that the stuck was currently executing lua when the panic occured. This is especially true with filters, one could simply register a lua filter that does nothing but this will still end up initializing the stream hlua context for each stream. If the thread end up being stuck during the stream handling, then debug dumping functions will report that the stream was stuck while handling lua, which is not necessarilly true, and could in fact confuse us even more. So here we take another approach, we add the BUSY flag to hlua context: this flag is set by hlua_ctx_resume() around lua_resume() call, this way we can precisely tell if the thread was handling lua when it was interrupted, and we rely on this flag in debug functions to check if the thread was effectively stuck inside lua or not while processing the stream No backport needed unless a commit depends on it. |
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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)