RTEMS 4.6.1 On-Line Library

ITRON Implementation Status Introduction

RTEMS ITRON 3.0 API User's Guide

14.1: Introduction

This chapter describes the status of the implementation of each manager in the RTEMS implementataion of the uITRON 3.0 API. The status of each manager is presented in terms of documentation and status relative to the extended level (level 'E') of the uITRON 3.0 API specification. The extended level of the specification is the level at which dynamic object creation, deletion, and reference services are available. This level is more akin to the other APIs supported by RTEMS. This purpose of this chapter is to make it clear what is required to bring the RTEMS uITRON API implementation into compliance with the specification. The following description of the specification levels is taken from the uITRON 3.0 API specification.

uITRON 3.0 specification is divided into fewer system call levels than was the previous uITRON 2.0 specification. There are now just three levels: Level R (Required), Level S (Standard) and Level E (Extended). In addition to these three levels, there is also Level C for CPU-dependent system calls. In addition, the uITRON 3.0 API, defines the network level ('N') which represents system calls that support the connection function

[level R] (Required) The functions in this level are mandatory for all implementations of uITRON 3.0 specification. This includes basic functions for achieving a real-time, multitasking OS. These functions can be implemented even without a hardware timer. This level corresponds to Levels 1 and 2 of uITRON 2.0 specification.
[level S] (Standard) This includes basic functions for achieving a real-time, multitasking OS. This level corresponds to Levels 3 and 4 of uITRON 2.0 specification.
[level E] (Extended) This includes additional and extended functions. This corresponds to functions not included in uITRON 2.0 specification (functions of ITRON2 specification). Specifically, this level includes object creation and deletion functions, rendezvous functions, memorypools and the timer handler.
[level C] (CPU dependent) This level provides implementation-dependent functions required due to the CPU or hardware configuration.

The support level of the connection function is indicated by appending an 'N' to the end of the level. For example, connectivity supported at [level S] would be referred to as [level SN]. The support level for functions which can only send requests for operations on other nodes but offer no system call processing on the issuing node itself are indicated by the lower case letter 's' or 'e'.

RTEMS ITRON 3.0 API User's Guide