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From: Frank Singhoff <singhoff@beru.univ-brest.fr>
Newsgroups: comp.lang.ada
Subject: ANNOUNCE : Cheddar 1.2p0
Date: 18 Oct 2002 16:34:02 GMT
Organization: Universite de Bretagne Occidentale
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The LIMI/EA2215 team is pleased to announce a new release of Cheddar,
 a free real time scheduling
simulator. Cheddar is a scheduling framework designed for educational purpose
and for quick  prototyping of real time scheduling algorithms. Cheddar
is composed of two independent parts : a graphical editor used to 
describe a real time application/system, and a library which includes
classical real time scheduling/feasability algotithms/tests.

The current release is now 1-2p0.


Cheddar is distributed under the GNU GPL license.  
Source code, binairies and documentation can be downloaded from :

http://beru.univ-brest.fr/~singhoff/cheddar

Cheddar is written in ADA with GtkADA for the graphical editor part. 
Cheddar runs on Solaris, Linux and
win32 boxes and should run on every GNAT/GTKADA supported platforms
(see ACT web site for details).


With Cheddar, you can : 
        - Draw scheduling with classical real time schedulers 
		(Rate Monotonic, Deadline Monotonic, 
		schedulers, Least Laxity First and Earliest Deadline 
		First, POSIX.4 queueing policies).		
	- Check scheduling faisability with :
        	- Response times (with DM and RM).
        	- Processor utilization (with EDF, LLF, RM and DM).
        	- Scheduling for a given base period.
	- Support for aperiodic and periodic tasks (with jitter
		and deadline > period).



The new features are :
	- A small framework is provided to design/test multiprocessor 
	  schedulers. In the current
	  release, a scheduler with precedencies is built with this
	  framework
	- SCHED_FIFO/SCHED_RR/SCHED_OTHERS Posix 4
		scheduler
	- Shared resources support (scheduling and
		blocking time analysis).
		Supported protocols : PIP, PCP.
	- A small user's guide is now provided
	- Tools to express and do simulations with task precedencies.
	- Tindell end to end response time computation.
	- Chetto and Blazewicz task parameter modification algorithms
		to take care of task precedencies 
	- Tools to compute bounds on buffers shared
		by periodic tasks.
	- Many fixed bugs from the previous release


Work in progress  : 
	- Write a user'guide of the framework
	- Response time for EDF and LLF schedulers.
	- SRP support.
	- Message scheduling.




Feel free to contact us for help or bugs report.



Best Regards,
The LIMI/EA2215 team