Introduction to my embedded multithread library for ARM

Development Boards MicroMod
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The library is designed to support ARM Cortex M0, with very small memory usage.

It can be downloaded from google code

http://code.google.com/p/tinythread/

TinyThread Specifications

Multitask

  • Round-Robin

    Preemptive

    Can avoid priority inversion by mutex

    • Task Specifications

  • Define Tasks, Unlimited

    Active Tasks, Unlimited

    User Priorities, Unlimited

    Thread Stack Checking, Supported

    • Context Switch Time,

  • <300 cycles without thread sleeping and stack checking supported.

    <400 cycles with thread sleeping and stack checking supported.

    • Time

  • delay, supported by tt_sleep()

    micro delay, supported by tt_usleep()

    • Inter-Task Communication

  • Semaphores, Unlimited

    Mutexes, Unlimited

    Recursive mutexes, Unlimited

    Conditions, Unlimited

    Mailbox(Message), Unlimited

    • Thread/Irq Communication

  • Semaphores/Mutexes/Recursive Mutexed/Conditions can be used in Irq. (Some functions are limited, see Doc\TinyThread.doc)

    • Memory specifications

  • RAM Space for a Task
  • Task Stack Size + 68 Bytes(MAX)

    Task Stack Size + 28 Bytes(MIN)


    • RAM Space for a Semaphore, 8 Bytes

    RAM Space for a Mutex, 8 Bytes

    RAM Space for a Recursive Mutex, 16 Bytes

    RAM Space for a Condition, 12 Bytes

    RAM Space for a Mailbox, 40 Bytes + user defined message buffer