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NuttX TODO List (Last updated July 12, 2011)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
patacongo
committed
(5) Task/Scheduler (sched/)
(1) Memory Managment (mm/)
(1) Signals (sched/, arch/)
(1) pthreads (sched/)
(1) C++ Support
(2) USB (drivers/usbdev, drivers/usbhost)
patacongo
committed
(1) Graphics subystem (graphics/)
(5) Build system / Toolchains
(2) ARM/i.MX (arch/arm/src/imx/)
(4) ARM/STM32 (arch/arm/src/stm32/)
(2) Hitachi/Renesas SH-1 (arch/sh/src/sh1)
(4) Renesas M16C/26 (arch/sh/src/m16c)
apps/
(5) Network Utilities (apps/netutils/)
(5) NuttShell (NSH) (apps/nshlib)
(5) Other Applications & Tests (apps/examples/)
o Task/Scheduler (sched/)
^^^^^^^^^^^^^^^^^^^^^^^
Description: When a tasks exits, shouldn't all of its child pthreads also be
terminated?
Status: Open
Priority: Medium, required for good emulation of process/pthread model.
Description: atexit() supports registration of only single function called on
exit(). It should support multiple functions registered by atexit()
or onexit() and these should be called in reverse order of
registration when the task exits.
Priority: Low
Description: Implement sys/mman.h and functions
Status: Open
Priority: Low
Description: Implement sys/wait.h and functions. Consider implementing wait,
waitpid, waitid. At present, a parent has no information about
child tasks.
Update: A simple but usable version of waitpid() has been included.
This version is not compliant with all specifications and can be
enabled with CONFIG_SCHED_WAITPID.
Status: Open
Priority: Low
Description: Several APIs do not set errno. Need to review all APIs.
Status: Open
Priority: Medium, required for standard compliance (but makes the
code bigger)
o On-demand paging (sched/)
^^^^^^^^^^^^^^^^^^^^^^^^^
Description: On-demand paging has recently been incorporated into the RTOS.
The design of this feature is described here:
http://www.nuttx.org/NuttXDemandPaging.html.
As of this writing, the basic feature implementation is
complete and much of the logic has been verified. The test
harness for the feature exists only for the NXP LPC3131 (see
configs/ea3131/pgnsh and locked directories). There are
some limitations of this testing so I still cannot say that
the feature is fully functional.
o Other core OS logic
^^^^^^^^^^^^^^^^^^^
Description: get_environ_ptr() (sched/sched_getenvironptr.c) is not implemented.
The representation of the the environment strings selected for
NutX is not compatible with the operation. Some significant
re-design would be required to implement this funcion and that
effort is thought to be not worth the result.
Status: Open
Priority: Low -- There is no plan to implement this.
Description: timer_getoverrun() (sched/timer_getoverrun.c) is not implemented.
Status: Open
Priority: Low -- There is no plan to implement this.
o Memory Managment (mm/)
^^^^^^^^^^^^^^^^^^^^^^
Description: Add an option to free all memory allocated by a task when the
task exits. This is probably not be worth the overhead for a
deeply embedded system.
There would be complexities with this implementation as well
because often one task allocates memory and then passes the
memory to another: The task that "owns" the memory may not
be the same as the task that allocated the memory.
Status: Open
Priority: Medium/Low, a good feature to prevent memory leaks but would
have negative impact on memory usage and code size.
o Signals (sched/, arch/)
^^^^^^^^^^^^^^^^^^^^^^^
Description: 'Standard' signals and signal actions are not supported.
(e.g., SIGINT, SIGCHLD, SIGSEGV, etc).
Status: Open
Priority: Low, required by standards but not so critical for an
embedded system.
o pthreads (sched/)
^^^^^^^^^^^^^^^^^
Description: pthread_cancel(): Should implement cancellation points and
pthread_testcancel()
Status: Open
Priority: Low, probably not that useful
^^^^^^^^^^^
Description: Need to call static constructors
Status: Open
Priority: Low, depends on toolchain. Call to gcc's built-in static
constructor logic will probably have to be performed by
user logic in user_start().
Description: Not all of the NXFLAT test under apps/examples/nxflat are working.
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Most simply do not compile yet. tests/mutex runs okay but
outputs garbage on completion.
Status: Open
Priority: High
Description: The ARM up_getpicbase() does not seem to work. This means
the some features like wdog's might not work in NXFLAT modules.
Status: Open
Priority: Medium-High
Description: At present, all .rodata must be put into RAM. There is a
tentative design change that might allow .rodata to be placed
in FLASH (see Documentation/NuttXNxFlat.html).
Status: Open
Priority: Medium
Description: If the function pointer to a statically defined function is
taken, then GCC generates a relocation that cannot be handled
by NXFLAT. There is a solution described in Documentataion/NuttXNxFlat.html,
by that would require a compiler change (which we want to avoid).
The simple workaround is to make such functions global in scope.
Status: Open
Priority: Low (probably will not fix)
Description: In the NXFLAT symbol tables... Using a 32-bit hash value instead
of a string to identify a symbol should result in a smaller footprint.
Status: Open
Priority: Low
Description: Windows build issue. Some of the configurations that use NXFLAT have
the linker script specified like this:
NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat.ld -no-check-sections
That will not work for windows-based tools because they require Windows
style paths. The solution is to do something like this:
if ($(WINTOOL)y)
NXFLATLDSCRIPT=${cygpath -w $(TOPDIR)/binfmt/libnxflat/gnu-nxflat.ld}
else
NXFLATLDSCRIPT=$(TOPDIR)/binfmt/libnxflat/gnu-nxflat.ld
endif
Then use
NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T"$(NXFLATLDSCRIPT)" -no-check-sections
Status: Open
Priority: There are too many references like the above. They will have
to get fixed as needed for Windows native tool builds.
Description: Should implement SOCK_RAW, SOCK_PACKET
Status: Open
Priority: Low
Description: uIP polling issues / Multiple network interface support:
(1) Current logic will not support multiple ethernet drivers.
Each driver should poll on TCP connections connect on the
network supported by the driver; UDP polling should respond
with TX data only if the UDP packet is intended for the
the network supported by the driver.
(2) If there were multiple drivers, polling would occur at
double the rate. Fix by using bound IP address in TCP
connection (lipaddr) and verifying that it is in the subnet
served by the driver.
Status: Open
Priority: Medium, The feature is not important, but it is important
for NuttX to resolve the architectural issues.
Description: sendto() and multiple network interface support:
When polled, would have to assure that the destination IP
is on the subnet served by the polling driver.
Status: Open
Priority: Medium, The feature is not important, but it is important
for NuttX to resolve the architectural issues.
Description: IPv6 support is incomplete. Adam Dunkels has recently announced
IPv6 support for uIP (currently only as part of Contiki). Those
changes need to be ported to NuttX.
Status: Open
Priority: Medium
Description: Incoming UDP broadcast should only be accepted if listening on
INADDR_ANY(?)
Status: Open
Priority: Low
Description: Read-ahead buffers capture incoming TCP data when no user
thread is recv-ing the data. Should add some driver call to
support throttling; when there is no listener for new data, the
driver should be throttled. Perhaps the driver should disable
RX interrupts when throttled and re-anable on each poll time.
recvfrom would, of course, have to un-throttle.
Status: Open
Priority: Medium
Description: Need to standardize collection of statistics from network
drivers. apps/nshlib ifconfig command should present
Description: At present, there cannot be two concurrent active TCP send
operations in progress using the same socket. This is because
the uIP ACK logic will support only one transfer at a time. The
solution is simple: A mutex will be needed to make sure that each
send that is started is able to be the exclusive sender until all of
the data to be sent has been ACKed.
Status: Open. There is some temporary logic to apps/nshlib that does
this same fix and that temporary logic should be removed when
send() is fixed.
Priority: Medium-Low. This is an important issue for applications that
send on the same TCP socket from multiple threads.
Description: TCP supports read-ahead buffering to handle the receipt of
TCP/IP packets when there is no read() in place. Should such
capability be useful for UDP? PRO: Would reduce packet loss
and enable support for poll()/select(). CON: UDP is inherently
lossy so why waste memory footprint?
Status: Open
Priority: Medium
Description: poll()/select() is not implemented for UDP sockets because they do
do not support read-ahead buffering. Therefore, there is never
a case where you can read from a UDP socket without blocking.
Status: Open, depends on UDP read-ahead support
Priority: Medium
Description: poll()/select() only works for availability of buffered TCP
read data (when read-ahead is enabled). The way writing is
handled in uIP, all sockets must wait when send and cannot
be notifiied when they can send without waiting.
Status: Open, probably will not be fixed.
Priority: Medium... this does effect porting of applications that expect
different behavior from poll()/select()
Description: sockets do not support all modes except for O_NONBLOCK. Sockets
support only (1) TCP/IP non-blocking read operations when read-ahead
buffering is enabled, and (2) TCP/IP accept() operations when TCP/IP
connection backlog is enabled.
Status: Open
Priority: Low.
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