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Willy Tarreau e73256fd2a BUG/MEDIUM: task/h2: add an idempotent task removal fucntion 
Previous commit 3ea351368 ("BUG/MEDIUM: h2: Remove the tasklet from the
task list if unsubscribing.") uncovered an issue which needs to be
addressed in the scheduler's API. The function task_remove_from_task_list()
was initially designed to remove a task from the running tasklet list from
within the scheduler, and had to be used in h2 to abort pending I/O events.
However this function was not designed to be idempotent, occasionally
causing a double removal from the tasklet list, with the second doing
nothing but affecting the apparent tasks count and making haproxy use
100% CPU on some tests consisting in stopping the client during some
transfers. The h2_unsubscribe() function can sometimes be called upon
stream exit after an error where the tasklet was possibly already
removed, so it.

This patch does 2 things :
  - it renames task_remove_from_task_list() to
    __task_remove_from_tasklet_list() to discourage users from calling
    it. Also note the fix in the naming since it's a tasklet list and
    not a task list. This function is still uesd from the scheduler.
  - it adds a new, idempotent, task_remove_from_tasklet_list() function
    which does nothing if the task is already not in the tasklet list.

This patch will need to be backported where the commit above is backported.
2019-03-25 18:02:54 +01:00
.github/ISSUE_TEMPLATE DOC: add github issue templates 2019-01-17 22:53:55 +01:00
contrib CONTRIB: contrib/prometheus-exporter: Add a Prometheus exporter for HAProxy 2019-02-08 13:55:21 +01:00
doc BUG/MINOR: doc: Be accurate on the behavior on pool-purge-delay. 2019-03-19 16:44:02 +01:00
ebtree CLEANUP: fix typos in comments in ebtree 2018-11-18 22:23:15 +01:00
examples CLEANUP: wurfl: remove dead, broken and unmaintained code 2019-03-05 13:46:12 +01:00
include BUG/MEDIUM: task/h2: add an idempotent task removal fucntion 2019-03-25 18:02:54 +01:00
reg-tests Revert "REGTEST: Enable reg tests with HEAD HTTP method usage." 2019-03-15 15:07:12 +01:00
scripts SCRIPTS: add the issue tracker URL to the announce script 2019-01-29 06:51:16 +01:00
src BUG/MEDIUM: task/h2: add an idempotent task removal fucntion 2019-03-25 18:02:54 +01:00
tests CLEANUP: fix a misspell in tests/filltab25.c 2018-11-18 22:23:15 +01:00
.gitignore DOC: split the README into README + INSTALL 2018-12-16 22:30:57 +01:00
CHANGELOG [RELEASE] Released version 2.0-dev1 2019-02-26 16:43:49 +01:00
CONTRIBUTING DOC: Fix typos in README and CONTRIBUTING 2018-11-12 08:54:12 +01:00
INSTALL CLEANUP: wurfl: remove dead, broken and unmaintained code 2019-03-05 13:46:12 +01:00
LICENSE
MAINTAINERS
Makefile BUILD: Makefile: resolve LEVEL before calling run-regtests 2019-03-15 17:29:53 +01:00
README DOC: split the README into README + INSTALL 2018-12-16 22:30:57 +01:00
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VERDATE [RELEASE] Released version 2.0-dev1 2019-02-26 16:43:49 +01:00
VERSION [RELEASE] Released version 2.0-dev1 2019-02-26 16:43:49 +01:00

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
  - 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)