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Andy Ross 49398cfbf6 tests/kernel/sched/schedule_api: Relax preemption order constraints
This test was testing for an undocumented and somewhat hyperspecific
behavior: when a process reaches a reschedule point and yields to a
higher priority thread, and there is another equal priority thread
active, which thread gets to run when the higher priority thread
finishes its work?  The original scheduler (because it leaves the
older thread in place in the list) implements the preemption like an
interrupt and returns to the original thread, despite the fact that
this then resets is time slice quantum unfairly.  In SMP mode, where
the current threads cannot live in the active list, the thread gets
added back to the end of the queue and the other thread runs.  In
effect, in UP mode "yield" and "reschedule" mean very slightly
different things where in SMP they act the same.

We don't document either behavior, as it happens.  Relax the test
constraints by adding a single deliberate k_yield() to unify behavior.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
2019-09-26 16:54:06 -04:00
.github/ISSUE_TEMPLATE templates: Update issue templates 2018-12-07 08:27:20 -05:00
.known-issues doc: introduce final structure 2019-02-05 07:04:40 -05:00
arch debug: tracing: Remove unneeded abstraction 2019-09-26 06:26:22 -04:00
boards board/shields: x-nucleo-iks01a3: configure irq-gpios for lis2mdl 2019-09-26 13:42:59 -07:00
cmake cmake: dts: Fix (harmless) --bindings-dirs typo 2019-09-25 06:11:26 -04:00
doc cmake: app: set zephyr_extra_modules from environment 2019-09-25 05:10:44 -04:00
drivers drivers: pwm: pwm_mchp_xec: Fix spelling 2019-09-26 16:52:58 -04:00
dts bindings/gpio: Add missing property "gpio-cells" 2019-09-26 12:35:28 -07:00
ext ext: hal: cmsis: add define for __PROGRAM_START 2019-09-26 16:35:50 +03:00
include debug: tracing: Remove unneeded abstraction 2019-09-26 06:26:22 -04:00
kernel kernel/timeout: Fix timeslicing edge case in SMP 2019-09-26 16:54:06 -04:00
lib cmake: don't link interface libraries with zephyr_interface 2019-09-26 05:50:46 -07:00
misc license: cleanup: add SPDX Apache-2.0 license identifier 2019-04-07 08:45:22 -04:00
modules modules: Kconfig.simplelink: Remove POSIX_API, use fine-grained opts 2019-09-25 20:56:29 -07:00
samples sample/shield: x-nucleo-iks01a3: add trig/temp/cfg support to LIS2MDL 2019-09-26 13:42:59 -07:00
scripts scripts: edtlib: Rename Interrupt/GPIO/etc. 'specifier' field to 'data' 2019-09-26 05:23:28 -07:00
soc debug: tracing: Remove unneeded abstraction 2019-09-26 06:26:22 -04:00
subsys cmake: don't link interface libraries with zephyr_interface 2019-09-26 05:50:46 -07:00
tests tests/kernel/sched/schedule_api: Relax preemption order constraints 2019-09-26 16:54:06 -04:00
.checkpatch.conf scripts/checkpatch.pl: fix root dir detection and enable it 2019-05-22 12:40:20 -04:00
.clang-format
.codecov.yml
.editorconfig editorconfig: Set insert_final_newline true 2019-04-10 14:15:38 +02:00
.gitattributes
.gitignore gitignore: ignore Emacs TAGS file 2019-06-27 07:18:35 -04:00
.gitlint gitlint: match max title length restriction with checkpatch 2019-05-29 14:43:16 -04:00
.mailmap mailmap: Fix entry needing both name and email replace 2019-06-26 13:54:03 -04:00
.shippable.yml ci: updates to fix pylint commit test 2019-09-13 10:00:16 -05:00
.uncrustify.cfg
CMakeLists.txt cmake: Cache the 'toolchain-is-ok' test as well 2019-09-07 10:25:12 -04:00
CODE_OF_CONDUCT.md coc: move to markdown format 2019-01-24 15:37:15 -05:00
CODEOWNERS CODEOWNERS: Add entry for JEDEC SPI-NOR flash driver 2019-09-26 05:24:20 -07:00
CONTRIBUTING.rst doc: Fixed a link in CONTRIBUTING.rst 2019-02-28 12:46:04 -08:00
Kconfig
Kconfig.zephyr kconfig: Convert device tree chosen properties to new kconfigfunctions 2019-09-13 11:42:34 -05:00
LICENSE
Makefile doc: add clean target to Makefile 2019-02-05 16:58:14 -05:00
README.rst doc: fix broken doc links 2019-09-06 16:14:39 +02:00
VERSION release: Post-release patch level update 2019-09-07 12:29:56 +02:00
version.h.in cmake: explain BUILD_VERSION and KERNEL_VERSION_* 2019-05-09 11:52:05 +02:00
west.yml modules: hal_nordic: Enable extended SPIM features only when needed 2019-09-26 19:13:41 +02:00
zephyr-env.cmd scripts: remove west from scripts/ 2019-01-29 10:15:01 +01:00
zephyr-env.sh env: ignore unset var 2019-05-20 09:26:31 -04:00

.. 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>
   <img
   src="https://api.shippable.com/projects/58ffb2b8baa5e307002e1d79/badge?branch=master">


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.

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://zephyrproject.org/developers/#downloads
* **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
  (shippable) 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