7d1031cc71
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@394 42af7a65-404d-4744-a932-0658087f49c3
110 lines
4.2 KiB
Plaintext
110 lines
4.2 KiB
Plaintext
NuttX TODO List
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^^^^^^^^^^^^^^^
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o Task/Scheduler
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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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- Consider implementing wait, waitpid, waitid. At present, a parent has
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no information about child tasks.
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- Several APIs do not set errno. Need to review all APIs.
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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 is probably not be worth the overhead for a deeply embedded system.
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- Current logic adapts size_t for 16-bit address machines vs. 32-bit address
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machines. But a small memory option should also be provided so that
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the small offset option can be used with 32-bit machines that have small
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RAM memories (like the lpc2148)
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o Signals
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- 'Standard' signals and signal actions are not supported.
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o pthreads
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- pthread_cancel(): Should implement cancellation points and pthread_testcancel()
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o C++ Support
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- Need to call static constructors
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o Network
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- Did not implement send() and sendto() timeouts. Option is setable via setsockopt,
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but is not implemented.
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- uIP's netutils/telnetd (and maybe others) are seriously broken.
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Need to be re-written to use listen() and accept()
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- uIP's netutils/webserver does not work reliably
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- Should implement SOCK_RAW
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- accept() and recvfrom() need to return connection address
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- Performance Improvements (uIP is not very fast):
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- Improve performance by stimulating the driver to accept new TX data before the
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next polling interval.
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Add a txail callback into driver to eliminate send delays. Since we want to
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support multiple network devices, this means we will have to add some infrastructure
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to map to device.
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- uIP polling issues:
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(1) Current logic will not support multiple ethernet drivers. Each driver should
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poll on TCP connections connect on the network supported by the driver; UDP
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polling should respond with TX data only if the UDP packet is intended for the
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the network supported by the driver.
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(2) If there were multiple drivers, polling would occur at double the rate.i
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Fix by using bound IP address in TCP connection (lipaddr) and verifying that it
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is in the subnet served by the driver.
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- uIP/Socket callback logic is not thread safe. This means that a socket cannot be
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used concurrently by two threads. Minimal fix: Add mutex to support exclusion.
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o USB
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- Implement USB device support
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- Implement USB bulk device
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o Libraries
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- sscanf() and lib_vsprintf() do not support floating point values.
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- The definition of environ in stdlib.h is bogus and will not work as it should. This
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is because the underlying representation of the environment is not an arry of pointers.
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o File system
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- Add chmod(), truncate().
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- FAT32: long file names
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o Documentation
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- Document fs/ & driver/ logic
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- Document C-library APIs
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o Build system
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- Some names under arch are still incorrect. These should be processor architecture
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names: pjrc-8051 should be 805x
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- configs/pjrc-8051 should be configs/pjrc-87c52
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- Dependencies do not work correctly under configs/<board>/src (same as arch/<arch>/src/board).
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o Applications & Tests
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o C5471
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o DM320
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- It seems that when a lot of debug statements are added, the system no
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longer boots. There could be some issue with the bootloader or with
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the programming of the SDRAM MMU regions.
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o LPC214x
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- Finish bringup
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- Add MMC and USB support
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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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