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This is to be used in the QUIC code, where the multiple producers are the listener threads, and the single consumer is the datagram handler thread. Entries are variable-length with a size header, and are kept contiguous in the buffer, so padding is inserted at the end when an entry would otherwise wrap around. The size field is overloaded to also mark padding (-1) and entries that are still free or not yet ready for reads (0). Headers and payloads are aligned on 8 bytes. Aligning on 16 bytes might be beneficial on some architectures to let memcpy() use 128-bit SIMD instructions. The head and tail offsets are 64-bit unsigned integers, making ABA issues from integer overflow impossible on current or near-future hardware. Reservation uses a CAS rather than FAA because of the need to insert padding to keep entries contiguous.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.