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For advanced async handlers only (Registered using EVENT_HDL_ASYNC_TASK() macro): event->when is provided as a struct timeval and fetched from 'date' haproxy global variable. Thanks to 'when', related event consumers will be able to timestamp events, even if they don't work in real-time or near real-time. Indeed, unlike sync or normal async handlers, advanced async handlers could purposely delay the consumption of pending events, which means that the date wouldn't be accurate if computed directly from within the handler.
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)