Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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sched/wqueue: restore -ENOENT from work_cancel() for unqueued work
work_cancel() used to return -ENOENT when the work structure was not
in the queue, and callers depend on that: aio_cancel() tears down the
AIO container (file_put() + aioc_free()) only when work_cancel()
reports success, because a work item that is not queued may already be
executing on a worker thread (see the comment in fs/aio/aio_cancel.c).

Since commit 6f72f5481d ("sched/wqueue: Refactor delayed and periodical
workqueue") work_cancel() returns OK unconditionally, and commit
d2e01b9055 ("sched/wqueue: harden custom queue lifecycle") kept that
behaviour and dropped -ENOENT from the function documentation.  Under
SMP the LTP aio_cancel tests then free the aio container and its file
while the lpwork thread is still executing aio_write_worker() on it,
which ends in a page fault in file_write() (f_inode == NULL) and a
panic.

Return -ENOENT again when the work is not queued, and document it.
For the synchronous variant "not queued" alone does not tell whether
the callback is running: the worker scan does, so report OK when a
running callback was found and waited for, and -ENOENT only when the
work was neither queued nor running.

Assisted-by: Claude Code
Signed-off-by: raiden00pl <raiden00@railab.me>
2026-09-13 11:31:41 +08:00
.github tools/ci: remove obsolete testrun harness 2026-09-02 11:44:23 -03:00
arch arch/arm/imxrt: fix nxstyle alignment in imxrt_clockconfig_ver2.c 2026-09-11 12:54:06 -03:00
audio audio: limit the buffer count guard to shared ring requests 2026-08-05 07:58:53 +02:00
binfmt libs/libc/elf, binfmt: Describe the GOT by base and size, not by index. 2026-09-08 16:31:16 -03:00
boards boards/risc-v/qemu-rv: switch rv-virt pnsh/pnsh64 to nxinit entrypoint 2026-09-13 11:15:24 +08:00
cmake cmake: fix undefined function name in parse args error messages 2026-09-11 21:15:22 +08:00
crypto tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-07-28 21:26:03 -03:00
Documentation tools/refresh.sh: Fix multi-argument parsing 2026-09-10 16:26:53 +02:00
drivers drivers/sensors: fix nxstyle errors in sensor.c 2026-09-13 10:29:08 +08:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs fs/fat: fix nxstyle violations flagged by CI 2026-09-11 10:55:25 -03:00
graphics graphics/nxterm: consume SGR escape sequences 2026-08-23 10:46:02 +08:00
include drivers/sensors: add resistance, conductivity, energy and charge types 2026-09-13 10:29:08 +08:00
libs arch/arm, libs/libc/elf: Build FDPIC modules in the normal ELF build. 2026-09-09 10:21:21 +08:00
mm mm/pgalloc: support 32 KB and 64 KB page sizes 2026-09-10 23:28:43 +08:00
net net/tcp: add configurable delayed ACK threshold 2026-09-08 09:00:19 +08:00
openamp cmake: Use NUTTX(_DIR/_BIN_DIR) instead CMAKE(_SRC_DIR/_BIN_DIR) 2026-08-09 11:13:08 -03:00
pass1 tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-07-28 21:26:03 -03:00
sched sched/wqueue: restore -ENOENT from work_cancel() for unqueued work 2026-09-13 11:31:41 +08:00
syscall fs: rename PSEUDOFS_SOFTLINKS to FS_LINKS 2026-08-27 01:12:33 +08:00
tools tools/nxstyle: whitelist Micro XRCE-DDS type names 2026-09-11 03:00:05 +08:00
video video/videomode: Fix EDID parsing and formatting of video mode dumps 2026-08-29 11:09:11 -03:00
wireless wireless/bluetooth: fix inverted MTU cap in bt_conn_send() 2026-08-30 10:48:18 -03:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines arch/arm: Reserve r10 via ARCHCFLAGS and hoist the PIC module flags. 2026-07-24 23:09:08 +08:00
.codespellrc Revert "zbus: Add linker support and documentation for the zbus port" 2026-08-30 10:45:19 -03:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore boards/risc-v/eic7700x: Adopt the common board layout. 2026-08-19 01:40:57 +08:00
.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 Jorge Guzman 2026-08-25 08:43:13 -04:00
CMakeLists.txt arch, boards, cmake: Build C++ ELF modules without __cxa_atexit. 2026-09-04 15:44:24 -03:00
CONTRIBUTING.md contributing: Add requirement for 'Assisted-by' commit field 2026-07-12 09:42:28 +08:00
INVIOLABLES.md INVIOLABLES.md: Fix a simple alignment and change occurrences of Nuttx 2020-09-03 01:33:05 +08:00
Kconfig include/nuttx: Add link-time iterable sections infrastructure 2026-08-27 01:04:05 +08:00
LICENSE libs/libdsp: Add Matrix operations 2026-07-11 14:55:59 -03:00
Makefile !boards: enforce secure ROMFS passwd and TEA key setup 2026-07-09 22:41:11 +08:00
NOTICE Remove the double blank line from source files 2022-02-20 20:10:14 +01:00
README.md ci/testing: Add MemBrowse Integration 2026-06-18 12:07:41 -03:00
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.