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Peter Bigot 656c09589a kernel: work: fix race condition with cancel before work runs
The original state management solution involved separate locks for a
work queue and each work item.  To avoid inter-lock dependencies a
window was left between the point where the work item was removed from
the queue (protected by queue lock) and the point where the work item
state was updated to mark the work item running.

This introduced a bug: If a cancellation was issued during this window
it would succeed, and the work item would appear to be idle even
though in fact the work queue thread was about to run it.

Since there is now only one lock, move the work item state updates
into the mutex regions associated with dequeuing the work item and
clearing the work queue busy flag.

Note that removing the window between queue and work mutex regions
eliminates the potential of having a dequeued work item be cancelled
before its QUEUED flag is cleared, simplifying the work item state
update.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
2021-05-18 15:02:08 +02:00
.buildkite ci: Reduce number of workers back to 20 2021-05-10 05:27:27 -05:00
.github actions: publish docs twice daily 2021-05-17 11:49:36 -04:00
arch arch/x86: Correct multiboot interpretation when building for EFI 2021-05-15 15:30:02 -04:00
boards boards: arm: Add arduino_serial to supported list for NXP boards 2021-05-18 12:35:39 +03:00
cmake cmake: cleanup version printing during CMake configure time 2021-05-07 20:50:02 -04:00
doc doc: kernel: thread stack is not the same as stack object 2021-05-17 17:32:12 -04:00
drivers drivers: ethernet: stm32: enable IRQ at the end of iface init 2021-05-17 10:59:43 -04:00
dts dts: arm: stm32f{2,4,7}: fix device tree warning 2021-05-17 09:52:27 -05:00
include power: trace power events 2021-05-17 18:45:57 -04:00
kernel kernel: work: fix race condition with cancel before work runs 2021-05-18 15:02:08 +02:00
lib libc: minimal: Add EOVERFLOW 2021-05-17 09:11:15 -04:00
misc toolchain: add GEN_ABSOLUTE_SYM_KCONFIG() 2021-02-02 09:23:45 -05:00
modules kconfig: TraceRecorder Kconfig file for undefined symbols 2021-05-11 13:00:05 -05:00
samples samples: lsm6dso: enable float printing 2021-05-18 08:34:20 -04:00
scripts twister: fix hardware map generation 2021-05-17 11:47:50 -04:00
share cmake: using MD5_INFILE variable instead of ZephyrPackagePath.txt 2021-02-23 19:34:27 +01:00
soc ITE Keyboard scan: add registers for ITE keyboard scan driver 2021-05-17 15:24:11 -04:00
subsys Bluetooth: Mesh: Pass correct pointer to publish_sent 2021-05-18 11:05:46 +02:00
tests tests/kernel/fatal: Don't swap while locked 2021-05-17 15:27:37 -04:00
.checkpatch.conf checkpatch: ignore linux specific ENOSYS warning 2021-03-30 10:50:14 -05:00
.clang-format clang-format: Change lines length limit from 80 to 100 2021-05-06 08:13:32 -05:00
.codecov.yml
.editorconfig editorconfig: indent Kconfig files with tabs 2020-07-08 21:30:38 -04:00
.gitattributes gitattributes: Tell linguist to ignore test pattern files 2020-04-23 14:07:57 -04:00
.gitignore gitignore: add common Python venv directories 2021-04-20 11:30:40 -05:00
.gitlint
.mailmap
.uncrustify.cfg
CMakeLists.txt cmake: rework empty zephyr libraries handling. 2021-05-06 18:06:32 +02:00
CODE_OF_CONDUCT.md
CODEOWNERS CODEOWNERS, MAINTAINERS.yml: Update github username 2021-05-11 12:59:25 -05:00
CONTRIBUTING.rst
Kconfig kconfig: Clean up header comments and make them consistent 2019-11-04 17:31:27 -05:00
Kconfig.zephyr linker: add bits for pinned regions 2021-05-10 16:00:43 -05:00
LICENSE
MAINTAINERS.yml ITE MAINTAINERS: add section for ITE 2021-05-17 09:14:33 -04:00
README.rst doc: remove references to shippable 2021-03-04 07:14:11 -06:00
VERSION release: Zephyr 2.6.0-rc1 2021-05-09 19:09:41 -05:00
version.h.in
west.yml west.yml: esp32: bugfixes and improvements 2021-05-13 22:03:39 -04:00
zephyr-env.cmd
zephyr-env.sh zephyr_env.sh: Remove semicolons at ends of lines 2019-12-10 14:34:46 -08:00

.. raw:: html

   <a href="https://www.zephyrproject.org">
     <p align="center">
       <img src="doc/images/Zephyr-Project.png">
     </p>
   </a>

   <a href="https://bestpractices.coreinfrastructure.org/projects/74"><img
   src="https://bestpractices.coreinfrastructure.org/projects/74/badge"></a>
   <a href="https://buildkite.com/zephyr/zephyr">
   <img
   src="https://badge.buildkite.com/f5bd0dc88306cee17c9b38e78d11bb74a6291e3f40e7d13f31.svg?branch=master"></a>


The Zephyr Project is a scalable real-time operating system (RTOS) supporting
multiple hardware architectures, optimized for resource constrained devices,
and built with security in mind.

The Zephyr OS is based on a small-footprint kernel designed for use on
resource-constrained systems: from simple embedded environmental sensors and
LED wearables to sophisticated smart watches and IoT wireless gateways.

The Zephyr kernel supports multiple architectures, including ARM Cortex-M,
Intel x86, ARC, Nios II, Tensilica Xtensa, and RISC-V, and a large number of
`supported boards`_.

.. below included in doc/introduction/introduction.rst

.. start_include_here

Getting Started
***************

Welcome to Zephyr! See the `Introduction to Zephyr`_ for a high-level overview,
and the documentation's `Getting Started Guide`_ to start developing.

Community Support
*****************

Community support is provided via mailing lists and Slack; see the Resources
below for details.

.. _project-resources:

Resources
*********

Here's a quick summary of resources to help you find your way around:

* **Help**: `Asking for Help Tips`_
* **Documentation**: http://docs.zephyrproject.org (`Getting Started Guide`_)
* **Source Code**: https://github.com/zephyrproject-rtos/zephyr is the main
  repository; https://elixir.bootlin.com/zephyr/latest/source contains a
  searchable index
* **Releases**: https://github.com/zephyrproject-rtos/zephyr/releases
* **Samples and example code**: see `Sample and Demo Code Examples`_
* **Mailing Lists**: users@lists.zephyrproject.org and
  devel@lists.zephyrproject.org are the main user and developer mailing lists,
  respectively. You can join the developer's list and search its archives at
  `Zephyr Development mailing list`_. The other `Zephyr mailing list
  subgroups`_ have their own archives and sign-up pages.
* **Nightly CI Build Status**: https://lists.zephyrproject.org/g/builds
  The builds@lists.zephyrproject.org mailing list archives the CI
  (buildkite) nightly build results.
* **Chat**: Zephyr's Slack workspace is https://zephyrproject.slack.com.  Use
  this `Slack Invite`_ to register.
* **Contributing**: see the `Contribution Guide`_
* **Wiki**: `Zephyr GitHub wiki`_
* **Issues**: https://github.com/zephyrproject-rtos/zephyr/issues
* **Security Issues**: Email vulnerabilities@zephyrproject.org to report
  security issues; also see our `Security`_ documentation. Security issues are
  tracked separately at https://zephyrprojectsec.atlassian.net.
* **Zephyr Project Website**: https://zephyrproject.org

.. _Slack Invite: https://tinyurl.com/y5glwylp
.. _supported boards: http://docs.zephyrproject.org/latest/boards/index.html
.. _Zephyr Documentation: http://docs.zephyrproject.org
.. _Introduction to Zephyr: http://docs.zephyrproject.org/latest/introduction/index.html
.. _Getting Started Guide: http://docs.zephyrproject.org/latest/getting_started/index.html
.. _Contribution Guide: http://docs.zephyrproject.org/latest/contribute/index.html
.. _Zephyr GitHub wiki: https://github.com/zephyrproject-rtos/zephyr/wiki
.. _Zephyr Development mailing list: https://lists.zephyrproject.org/g/devel
.. _Zephyr mailing list subgroups: https://lists.zephyrproject.org/g/main/subgroups
.. _Sample and Demo Code Examples: http://docs.zephyrproject.org/latest/samples/index.html
.. _Security: http://docs.zephyrproject.org/latest/security/index.html
.. _Asking for Help Tips: https://docs.zephyrproject.org/latest/guides/getting-help.html