SparkFun Forums

[X-Hawk]

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