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NuttX TODO List
^^^^^^^^^^^^^^^
Task/Scheduler
^^^^^^^^^^^^^^
- When a tasks exits, shouldn't all of its child pthreads also be terminated?
- Should task_delete() cause atexit() function to be called?
- Implement sys/mman.h and functions
- Implement sys/wait.h and functions
- Implement priority inheritance
- Implement vfork(). Could be tricky because of stack references.
- Make the system timer frequency configurable via defconfig. See:
_POSIX_CLOCKRES_MIN in limits.h
CLK_TCK in time.h
Definitions in sched/clock_internal.h
o Memory Managment
- Add an option to free all memory allocated by a task when the task exits.
This may not be worth the overhead for a deeply embedded system.
o Signals
- 'Standard' signals and signal actions are not supported. Does this
make since in a deeply embedded system?
o pthreads
- pthread_cancel(): Should implemenent cancellation points and pthread_testcancel()
o Libraries
o File system
- This probabaly needs some rethinking.
- Add some concept like mount points to handle mounted "real" filesystems.
o Console Output
o Documentation
- Document fs & driver logic
- Document filesystem, library
o Build system
- Something leaves garbage link 'include' in arch/*/include
- Separate configurations from architectures. arch/* contains
generic logic. Like arch/armnommu, arch/arm, arch/805x, etc.
config/* has like config/pjrc-8052, config/c5471, etc.
o Applications & Tests
o C5471
- At present, there is a failure in the examples/ostest POSIX timer
test when CONFIG_DEBUG is enabled. This is almost certainly yet
another case where printf (or its kin) are being called from a
sensitive area in the OS.
o pjrc-8052 / MCS51
* Current status:
- Basic OS task management seems OK
- Fails when interrupts enabled. The stack pointer is around 0x6e
before the failure occurs. It looks like some issue when the
stack pointer moves from the directly to indirectly addressable
region (0x80 boundary).
- Work on the 8052 is temporarily on hold
- Use timer 0 as system timer. Timer 2 is needed for second UART.
Logic is implemented, but there needs to be a system configuration
to change the ticks-per-second value to match the timer interrupt
rate
- During build, there are several integer overflows reported:
gmtime_r.c aroud lines 184 and 185
clock_initialize.c at line 107
pthread_create.c at 330
sighand.c at 225 and 244
o DM320
- In progress
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