mirror of
https://git.haproxy.org/git/haproxy.git/
synced 2026-01-19 00:51:37 +01:00
082b62828d
We currently have the ability to register functions to be called early on thread creation and at thread deinitialization. It turns out this is not sufficient because certain such functions may use resources that are being allocated by the other ones, thus creating a race condition depending only on the linking order. For example the mworker needs to register a file descriptor while the pollers will reallocate the fd_updt[] array. Similarly logs and trashes may be used by some init functions while it's unclear whether they have been deduplicated. The same issue happens on deinit, if the fd_updt[] or trash is released before some functions finish to use them, we'll get into trouble. This patch creates a couple of early and late callbacks for per-thread allocation/freeing of resources. A few init functions were moved there, and the fd init code was split between the two (since it used to both allocate and initialize at once). This way the init/deinit sequence is expected to be safe now. This patch should be backported to 1.9 as at least the trash/log issue seems to be present. The run_thread_poll_loop() code is a bit different there as the mworker is not a callback, but it will have no effect and it's enough to drop the mworker changes. This bug was reported by Ilya Shipitsin in github issue #104.
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 - 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)