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When forcing a yield attempt from hlua_hook(), we should perform it on the known hlua state, not on a potential substate created using coroutine.create() from an existing hlua state from lua script. Indeed, only true hlua couroutines will properly handle the yield and perform the required timeout checks when returning in hlua_ctx_resume(). So far, this was not a concern because hlua_gethlua() would return NULL if hlua_hook() is not directly being called from a hlua coroutine anyway. But with this we're trying to make hlua_hook() ready for being called from a subcoroutine which inherits from a parent hlua ctx. In this case, no yield attempt will be performed, we will simply check for hlua timeouts. Not doing so would result in the timeout checks not being performed since hlua_ctx_resume() is completely bypassed when yielding from the subroutine, resulting in a user-defined coroutine potentially going rogue unnoticed.
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)