Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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ouyangxiangzhen d18fd4640e sched/hrtimer: Fix functional correctness issue in SMP.
Since the hrtimer->expired is not monotonic, it can not be used as the
version. This commit added the ownership encoding to ensure the
invariant that the cancelled the timer can not modify the hrtimer again.

Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>
2026-01-26 16:37:10 +08:00
.github .github/build.yml: fix python venv installation 2026-01-13 03:10:37 +08:00
arch arm64: remove busy wait flag 2026-01-26 16:27:19 +08:00
audio fs/file: unify prefix about file_xxx api, like file_open, file_ioctl 2025-06-12 18:12:42 +08:00
binfmt sched/task: move kernel stack allocation to task initialization 2026-01-18 23:05:11 +08:00
boards arm64: remove busy wait flag 2026-01-26 16:27:19 +08:00
cmake cmake(bugfix):elf link should depends on starupobjs crt0.o 2026-01-19 14:45:37 +08:00
crypto crypto/ecc: add SPDX license identifier 2026-01-26 10:55:57 +08:00
Documentation Documentation: add ECC/ECDSA note 2026-01-26 10:55:57 +08:00
drivers drivers/sensors: wakeup mode optimization. 2026-01-26 15:04:11 +08:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs sched/timer: Fix MISRA Rule 10.3 2026-01-22 22:14:00 +08:00
graphics sched/sleep: replace all Signal-based sleep implement to Scheduled sleep 2025-10-17 14:05:02 +08:00
include sched/hrtimer: Fix functional correctness issue in SMP. 2026-01-26 16:37:10 +08:00
libs pthread: move pthread_cond to userspace 2026-01-26 16:26:39 +08:00
mm kasan/hook.c: prevent recursive report overflow 2026-01-21 10:27:02 +08:00
net Revert "net: limit TCP and UDP send/recv buffer usage with throttled IOB" 2026-01-23 14:40:06 -03:00
openamp openamp: optimize virtqueue_notification() called condition 2026-01-19 14:18:27 +08:00
pass1 Revert "build depend:Revert Make.dep intermediate ddc file" 2024-09-15 19:29:47 +08:00
sched sched/hrtimer: Fix functional correctness issue in SMP. 2026-01-26 16:37:10 +08:00
syscall pthread: move pthread_cond to userspace 2026-01-26 16:26:39 +08:00
tools gdbserver.py:add x86_64 arch 2026-01-24 23:31:43 +08:00
video Revert "build depend:Revert Make.dep intermediate ddc file" 2024-09-15 19:29:47 +08:00
wireless net/wireless: fix compile warning 2025-12-25 18:05:33 +08:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines net/icmpv6: replace net_lock with conn_lock and conn_lock_dev 2025-12-29 09:42:18 +08:00
.codespellrc codespellrc: add ist to ignorelist 2025-10-14 17:42:01 +08:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore gitignore: add more vim swap files 2025-06-18 15:44:51 -04:00
.gitmessage docs/contributing: Add a commit message template 2025-06-03 17:33:24 +08:00
.pre-commit-config.yaml pre-commit: enable codespell checks 2025-05-05 12:34:39 +08:00
.yamllint feat: add a GitHub action to lint the YAML files 2020-12-15 09:52:04 -06:00
AUTHORS AUTHORS: add Michal Lenc 2025-12-03 08:46:33 -03:00
CMakeLists.txt cmake(feat):define elf option and enable apps module build 2026-01-19 14:45:37 +08:00
CONTRIBUTING.md style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
INVIOLABLES.md INVIOLABLES.md: Fix a simple alignment and change occurrences of Nuttx 2020-09-03 01:33:05 +08:00
Kconfig Kconfig: Add ALLOW_CUSTOM_PERMISSIVE_COMPONENTS option 2026-01-20 02:15:19 +08:00
LICENSE style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
Makefile tools: migrate to SPDX identifier 2024-09-10 23:11:11 +08:00
NOTICE Remove the double blank line from source files 2022-02-20 20:10:14 +01:00
README.md Gathering community recommendations 2023-10-28 13:55:56 +08:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.

Getting Started

First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.

Documentation

You can find the current NuttX documentation on the Documentation Page.

Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.

The old NuttX documentation is still available in the Apache wiki.

Supported Boards

NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.

Contributing

If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.

License

The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.