Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Bowen Wang aa7ec1083b nuttx/spinlock.h: add rspin_trylock/_irqsave/_nopreempt support
Add try-lock variants for rspinlock_t to support non-blocking spinlock
acquisition with optional IRQ save/restore and preemption control.
These variants enable fine-grained synchronization patterns in nested
contexts with maximum nesting depth support (UINT16_MAX).

Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>
2026-01-27 12:22:24 +08:00
.github .github/build.yml: fix python venv installation 2026-01-13 03:10:37 +08:00
arch shced/irq: Add up_irq_to_ndx interface 2026-01-27 10:34:13 +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 boards/sam3u-ek: Increase kflash size from 65K to 80K. 2026-01-27 10:37:37 +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 doc: Update Host Tools section. 2026-01-27 09:52:01 +08:00
drivers drivers/rpmsg: refactor internal APIs to private header 2026-01-26 17:23:31 -03:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs fs/fat: add support for FIOC_FILEPATH ioctl 2026-01-27 10:37:37 +08:00
graphics sched/sleep: replace all Signal-based sleep implement to Scheduled sleep 2025-10-17 14:05:02 +08:00
include nuttx/spinlock.h: add rspin_trylock/_irqsave/_nopreempt support 2026-01-27 12:22:24 +08:00
libs libstdc++: Relocate c++config.h from include/ to libstdc++ to preserve upstream integrity 2026-01-27 10:35:58 +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 shced/irq: Add up_irq_to_ndx interface 2026-01-27 10:34:13 +08:00
syscall pthread: move pthread_cond to userspace 2026-01-26 16:26:39 +08:00
tools tools/parsetrace.py: Fix get_typesize bug in parsetrace.py 2026-01-26 23:22:41 +01:00
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
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
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
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.