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HAProxy - Load balancer
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Willy Tarreau 3b8f9b7b88 BUG/MEDIUM: lists: add missing store barrier in MT_LIST_ADD/MT_LIST_ADDQ 
The torture test run for previous commit 787dc20 ("BUG/MEDIUM: lists: add
missing store barrier on MT_LIST_BEHEAD()") finally broke again after 34M
connections. It appeared that MT_LIST_ADD and MT_LIST_ADDQ were suffering
from the same missing barrier when restoring the original pointers before
giving up, when checking if the element was already added. This is indeed
something which seldom happens with the shared scheduler, in case two
threads simultaneously try to wake up the same tasklet.

With a store barrier there after reverting the pointers, the torture test
survived 750M connections on the NanoPI-Fire3, so it looks good this time.
Probably that MT_LIST_BEHEAD should be added to test-list.c since it seems
to be more sensitive to concurrent accesses with MT_LIST_ADDQ.

It's worth noting that there is no barrier between the last two pointers
update, while there is one in MT_LIST_POP and MT_LIST_BEHEAD, the latter
having shown to be needed, but I cannot demonstrate why we would need
one here. Given that the code seems solid here, let's stick to what is
shown to work.

This fix should be backported to 2.1, just for the sake of safety since
the issue couldn't be triggered there, but it could change with the
compiler or when backporting a fix for example.
2020-07-09 05:01:27 +02:00
.github CI: extend spellchecker whitelist 2020-06-26 11:26:52 +02:00
contrib CLEANUP: contrib/prometheus-exporter: typo fixes for ssl reuse metric 2020-07-07 23:15:03 +02:00
doc MINOR: config: make strict limits enabled by default 2020-07-07 16:52:35 +02:00
examples CLEANUP: assorted typo fixes in the code and comments 2020-06-26 11:27:28 +02:00
include BUG/MEDIUM: lists: add missing store barrier in MT_LIST_ADD/MT_LIST_ADDQ 2020-07-09 05:01:27 +02:00
reg-tests BUG/MINOR: http-rules: Fix ACLs parsing for http deny rules 2020-06-30 09:32:03 +02:00
scripts CI: travis-ci: switch BoringSSL builds to ninja 2020-06-26 11:26:26 +02:00
src CLEANUP: Add static void hlua_deinit() 2020-07-07 16:52:35 +02:00
tests REORG: include: split mini-clist into haproxy/list and list-t.h 2020-06-11 10:18:56 +02:00
.cirrus.yml CI: cirrus-ci: exclude slow reg-tests 2020-07-04 06:58:14 +02:00
.gitignore DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
.travis.yml CI: travis-ci: switch BoringSSL builds to ninja 2020-06-26 11:26:26 +02:00
BRANCHES DOC: assorted typo fixes in the documentation 2020-03-09 14:45:58 +01:00
CHANGELOG [RELEASE] Released version 2.3-dev0 2020-07-07 16:39:18 +02:00
CONTRIBUTING DOC: assorted typo fixes in the documentation and Makefile 2020-03-06 10:49:55 +01:00
INSTALL MINOR: version: back to development, update status message 2020-07-07 16:38:51 +02:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS REORG: include: split hathreads into haproxy/thread.h and haproxy/thread-t.h 2020-06-11 10:18:56 +02:00
Makefile CLEANUP: makefile: update the outdated list of DEBUG_xxx options 2020-07-04 12:43:46 +02:00
README DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
ROADMAP DOC: update the outdated ROADMAP file 2019-06-15 21:59:54 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 2.2.0 2020-07-07 16:33:14 +02:00
VERSION [RELEASE] Released version 2.3-dev0 2020-07-07 16:35:28 +02:00

README 

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)