Clock synchronization in distributed real-time systems
IEEE Transactions on Computers - Special Issue on Real-Time Systems
ACM SIGAda Ada Letters
The design and implementation of the open Ravenscar kernel
IRTAW '00 Proceedings of the 10th international workshop on Real-time Ada workshop
Implementing a New Low-Level Tasking Support for the GNAT Runtime System
Ada-Europe '99 Proceedings of the 1999 Ada-Europe International Conference on Reliable Software Technologies
An Open Ravenscar Real-Time Kernel for GNAT
Ada-Europe '00 Proceedings of the 5th Ada-Europe International Conference on Reliable Software Technologies
Design and implementation of a Ravenscar extension for multiprocessors
Ada-Europe'11 Proceedings of the 16th Ada-Europe international conference on Reliable software technologies
GNAT pro for on-board mission-critical space applications
Ada-Europe'05 Proceedings of the 10th Ada-Europe international conference on Reliable Software Technologies
Embedded Systems Design
Preservation of timing properties with the ada ravenscar profile
Ada-Europe'10 Proceedings of the 15th Ada-Europe international conference on Reliable Software Technologies
| Hi-index | 0.00 |
A real-time kernel providing multitasking and timing services is a fundamental component of any real-time system. Timing services, which are crucial to the correct execution of this kind of applications, are usually provided by a real-time clock and timer manager, which is part of the kernel and implements the required functionality on top of the one or more hardware timers. Kernel timing services must be implemented carefully in order to avoid race problems and inconsistencies which may be caused by the fact that many common hardware timer chips are not intended at a direct implementation of software timing services. This paper provides advice on the implementation of two of the Ada timing services: Ada.Real_Time.Clock, and absolute delays (delay until). The example implementation of both services in the Open Ravenscar Kernel, which is based on the ideas presented in the paper, is also described.