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Apache NuttX is a mature, real-time embedded operating system (RTOS)
https://nuttx.apache.org/
7797b12244
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atexit_call_exitfuncs() cached its loop bound on entry
(for (idx = aehead->nfuncs - 1; idx >= 0; idx--)), while
atexit_register() appends new entries at funcs[nfuncs] and bumps nfuncs.
Any function registered by an exit handler via atexit() / on_exit() /
__cxa_atexit() lands above the cached bound and is never invoked, even
though the registration returns OK.
This contradicts the exit(3) documentation that NuttX mirrors verbatim
in its own exit() docstring (libs/libc/stdlib/lib_exit.c):
It is possible for one of these functions to use atexit(3) or
on_exit(3) to register an additional function to be executed
during exit processing; the new registration is added to the
front of the list of functions that remain to be called.
The same restructure closes a second defect: atexit_call_exitfuncs()
read and cleared the task-group-shared ta_exit list without holding
ta_lock, while atexit_register() takes it ("The following must be
atomic"). Entries are now claimed under the lock and the handler is
invoked with the lock released, so a handler re-entering
atexit_register() cannot deadlock (also safe with the non-recursive
nxmutex used here).
Evidence: exit(3) man page, DESCRIPTION -
https://man7.org/linux/man-pages/man3/exit.3.html
NuttX mirrors this passage verbatim in its own exit() docstring --
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| ReleaseNotes | ||
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.