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HAProxy - Load balancer
e06e8a2390
Modern compilers sometimes perform function tail merging and identical code folding, which consist in merging identical occurrences of same code paths, generally final ones (e.g. before a return, a jump or an unreachable statement). In the case of ABORT_NOW(), it can happen that the compiler merges all of them into a single one in a function, defeating the purpose of the check which initially was to figure where the bug occurred. Here we're creating a DO_NO_FOLD() macro which makes use of the line number and passes it as an integer argument to an empty asm() statement. The effect is a code position dependency which prevents the compiler from merging the code till that point (though it may still merge the following code). In practice it's efficient at stopping the compilers from merging calls to ha_crash_now(), which was the initial purpose. It may also be used to force certain optimization constructs since it gives more control to the developer. |
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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)