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Intro
 

Why a Preemptive Real Time Operating System?

Forth systems traditionally make use of cooperative multitasking. It is very simple and clever. But it has its limits. If you write all your software by yourself, each software part can be cooperative. But if you want to benefit from middleware written by somebody else (and most probably not written in Forth), you can be sure that software is not cooperative (in the context of multitasking). Forth wants to rule your system. I would like to have a Forth system that is cooperative. It should extend the system, to make it interactive and easy to use. The Forth itself is only a thread and can be used as some sort of CLI for testing purposes or could be the main part of the application.

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Contents
 

How to Create a Thread

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CMSIS-RTOS API

  • osNewDataStack
  • xPortGetFreeHeapSize

Kernel Management Functions

  • osKernelGetTickCount
  • osKernelGetTickFreq
  • osKernelGetSysTimerCount
  • osKernelGetSysTimerFreq

Generic Wait Functions

  • osDelay
  • osDelayUntil

Thread Management

  • osThreadNew
  • osThreadGetId
  • osThreadGetState
  • osThreadSetPriority
  • osThreadGetPriority
  • osThreadYield
  • osThreadSuspend
  • osThreadResume
  • osThreadExit
  • osThreadTerminate
  • osThreadGetStackSpace
  • osThreadGetCount
  • osThreadEnumerate

Timer Management Functions

  • osTimerNew
  • osTimerGetName
  • osTimerStart
  • osTimerStop
  • osTimerIsRunning
  • osTimerDelete

Event Flags Management Functions

  • osEventFlagsNew
  • osEventFlagsSet
  • osEventFlagsClear
  • osEventFlagsGet
  • osEventFlagsWait
  • osEventFlagsDelete

Mutex Management Functions

  • osMutexNew
  • osMutexAcquire
  • osMutexRelease
  • osMutexGetOwner
  • osMutexDelete

Semaphore Management Functions

  • osSemaphoreNew
  • osSemaphoreAcquire
  • osSemaphoreRelease
  • osSemaphoreGetCount
  • osSemaphoreDelete

Message Queue Management Functions

  • osMessageQueueNew
  • osMessageQueuePut
  • osMessageQueueGet
  • osMessageQueueGetCapacity
  • osMessageQueueGetMsgSize
  • osMessageQueueGetCount
  • osMessageQueueGetSpace
  • osMessageQueueReset
  • osMessageQueueDelete

 

A multi-tasking wordset for Standard Forth, Andrew Haley

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