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https://github.com/gwsystems/composite

A component-based OS
https://github.com/gwsystems/composite

components composite embedded-systems os parallelism real-time reliability

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A component-based OS

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README 

        
The _Composite_ Component-Based OS

==================================



This is the source code for the _Composite_ component-based OS.  Even

low-level system policies such as scheduling, memory mapping, and

synchronization are defined as discrete user-level components.  Each

component exports an interface used to harness its functionality, and

components are composed together to form an executable system.



Please see http://composite.seas.gwu.edu for publications and

more information.



Branches

--------



- `main` is the original system with a full user-level set of components.

- `ppos` is the Speck kernel emphasizing scalable predictability.

- `tcaps` has mainly been integrated into `ppos`, but a few unrelated pieces remain.



Research features of _Composite_

--------------------------------



See a summary of the research directions of _Composite_ at http://composite.seas.gwu.edu.



Where to start -- a tour of the source code

-------------------------------------------



- Please read the _Composite_ [posts](http://www.seas.gwu.edu/~gparmer/posts.html).



- Join the [email protected] mailing list.

    We use a #slack for our internal development, so this is exceedingly low throughput (1 email every 6 months).



- To run *Composite*, you start by reading the installation and usage

  summary in `docs/installation_usage_summary.md`.



_Composite_ system support

--------------------------



- x86-32

- x86-64

- Qemu with 32/64 bit, x86 support



Important note

--------------



**The code is pre-alpha quality.  Some parts are quite solid, many

  others are absolutely not.  Please consult with us to determine if

  it is right for your use-case.**



Licensing

---------



This code is licensed under the GPL version 2.0 with the class path exception unless otherwise noted (significant portions of user-level are BSD):



```

The Composite Component-Based OS

Copyright (C) 2009 Gabriel Parmer



This program is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public License

as published by the Free Software Foundation; either version 2

of the License, or (at your option) any later version.



This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.



Linking this library statically or dynamically with other

modules is making a combined work based on this library. Thus,

the terms and conditions of the GNU General Public License

cover the whole combination.



As a special exception, the copyright holders of this library

give you permission to link this library with independent modules

to produce an executable, regardless of the license terms of

these independent modules, and to copy and distribute the resulting

executable under terms of your choice, provided that you also meet,

for each linked independent module, the terms and conditions of

the license of that module. An independent module is a module which

is not derived from or based on this library. If you modify this

library, you may extend this exception to your version of the

library, but you are not obligated to do so. If you do not wish to

do so, delete this exception statement from your version.



You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

```



This license is not set in stone, and we would be willing to negotiate

on a case-by-case basis for more business-friendly terms.  The license

should not prevent you from using this OS, as alternatives can be

arranged.  It _should_ prevent you from stealing the work and claiming

it as your own.



Support

-------



We'd like to sincerely thank our sponsors.  The _Composite_

Component-Based OS development effort has been supported by grants

from the National Science Foundation (NSF) under awards `CNS 1137973`,

`CNS 1149675`, and `CNS 1117243`.