77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
NuttX TODO List
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^^^^^^^^^^^^^^^
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Task/Scheduler
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^^^^^^^^^^^^^^
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- When a tasks exits, shouldn't all of its child pthreads also be terminated?
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- Should task_delete() cause atexit() function to be called?
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- Implement sys/mman.h and functions
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- Implement sys/wait.h and functions
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- Implement priority inheritance
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- Implement vfork(). Could be tricky because of stack references.
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- Make the system timer frequency configurable via defconfig. See:
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_POSIX_CLOCKRES_MIN in limits.h
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CLK_TCK in time.h
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Definitions in sched/clock_internal.h
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- Consider implementing wait, waitpid, waitid. At present, a parent has
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no information about child tasks.
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o Memory Managment
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- Add an option to free all memory allocated by a task when the task exits.
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This may not be worth the overhead for a deeply embedded system.
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o Signals
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- 'Standard' signals and signal actions are not supported. Does this
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make since in a deeply embedded system?
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o pthreads
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- pthread_cancel(): Should implemenent cancellation points and pthread_testcancel()
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o Libraries
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- There needs to be some kind of mutual exclusion protection on buffered
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I/O. If two threads try fflush-ing at the same time, there is corruption
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of the output.
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o File system
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- This probabaly needs some rethinking.
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- Add some concept like mount points to handle mounted "real" filesystems.
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o Console Output
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o Documentation
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- Document fs & driver logic
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- Document filesystem, library
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o Build system
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- Something leaves garbage link 'include' in arch/*/include
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o Applications & Tests
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- Need a test for the pthread_barrierattr_* and pthread_barrier_* APIs.
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o C5471
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- At present, there is a failure in the examples/ostest POSIX timer
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test when CONFIG_DEBUG is enabled. This is almost certainly yet
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another case where printf (or its kin) are being called from a
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sensitive area in the OS.
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o pjrc-8052 / MCS51
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* Current status:
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- Basic OS task management seems OK
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- Fails when interrupts enabled. The stack pointer is around 0x6e
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before the failure occurs. It looks like some issue when the
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stack pointer moves from the directly to indirectly addressable
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region (0x80 boundary).
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- Work on the 8052 is temporarily on hold
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- Use timer 0 as system timer. Timer 2 is needed for second UART.
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Logic is implemented, but there needs to be a system configuration
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to change the ticks-per-second value to match the timer interrupt
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rate
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- During build, there are several integer overflows reported:
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gmtime_r.c aroud lines 184 and 185
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clock_initialize.c at line 107
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pthread_create.c at 330
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sighand.c at 225 and 244
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o DM320
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