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NuttX TODO List (Last updated May 8, 2010)
patacongo
committed
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
patacongo
committed
(5) Task/Scheduler (sched/)
(2) Memory Managment (mm/)
(1) Signals (sched/, arch/)
(1) pthreads (sched/)
(1) C++ Support
(15) Network (net/, drivers/net)
(3) Other Applications & Tests (examples/)
(2) Linux/Cywgin simulation (arch/sim)
(2) ARM/i.MX (arch/arm/src/imx/)
(4) pjrc-8052 / MCS51 (arch/pjrc-8051/)
(2) Hitachi/Renesas SH-1 (arch/sh/src/sh1)
(4) Renesas M16C/26 (arch/sh/src/m16c)
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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 one function called on exit().
Should task_delete() also cause atexit() function to be called?
Status: Open
Priority: Low, task_delete() is non-standard and its behavior is
unspecified.
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.
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 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.
Status: Open
Priority: Medium/Low, a good feature to prevent memory leaks but would
have negative impact on memory usage and code size.
Description: Current logic adapts size_t for 16-bit address machines vs.
32-bit address machines. But a small memory option should also
be provided so that the small offset option can be used with
32-bit machines that have small RAM memories (like the lpc2148)
Status: Open
Priority: High, a good feature enhancement.
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().
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o Binary loaders (binfmt/)
^^^^^^^^^^^^^^^^^^^^^^^^
Description: Not all of the NXFLAT test under examples/nxflat are working.
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
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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: Sendoto() 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.
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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. examples/nsh ifconfig command should present
statistics.
Status: Open
Priority: Low
Description: Outgoing packets are dropped and overwritten by ARP packets
if the destination IP has not been mapped to a MAC. Could
improve send() performance by explicitly performing ARP before
sending the packet.
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