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Extempore is a programming language and runtime environment designed to support 'cyberphysical programming'. Cyberphysical programming supports the notion of a human programmer operating as an active agent in a real-time distributed network of environmentally aware systems. The programmer interacts with the distributed real-time system procedurally by modifying code on-the-fly.

Extempore provides a completely hotswappable runtime environment with a strong temporal semantics, a flexible concurrency architecture, builtin support for distributed heterogenous operation (both OS and Architecture), and aims to provide flexible compiler-as-a-service functionality. Extempore makes extensive use of the LLVM project to provide back-end code generation.

Central to the Extempore programming environment is a new systems programming language designed to support the programming of real-time systems in real-time. xtlang is designed to mix the high-level expressiveness of Lisp with the low-level expressiveness of C.

xtlang uses an s-expression syntax common to Lisp, and more particularly to Scheme. xtlang also borrows many Lisp like semantics including first class closures, tail recursion and macros. However, xtlang also borrows heavily from systems languages like 'C' including static typing, low-level type expressivity, direct pointer manipulation and explicit memory managment (i.e. no GC). xtlang then extends these 'C' semantics with type-inferencing, ad-hoc polymorphism, reified generics, and zone/region based memory management.

Access rights

All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the authors nor other contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


Rittenbruch, M., Sorensen, A., Donovan, J., Polson, D., Docherty, M. & Jones, J. (2013). The Cube : a very largescale interactive engagement space. Paper presented at Proceedings of the 2013 ACM International Conference on Interactive Tabletops and Surfaces (ITS’13). Retrieved from http://eprints.qut.edu.au/61900/6/61900b.pdf

Research areas


Cite this collection

Rittenbruch, Markus; Sorensen , Anne; Donovan, Jared; Polson, Debra; Docherty, Michael; Jones, Jeff (2019): Extempore . Queensland University of Technology. (Service) https://doi.org/10.25912/5d3a893784aa3

Related information

ComputeMusic(now) Andrew Sorensen at TEDxQUT http://goo.gl/zqGCP5
Extempore Website http://extempore.moso.com.au/


Creative Commons Attribution-NonCommercial 4.0 (CC-BY-NC)


Copyright (c) 2011-2013, Andrew Sorensen

Data file types

Programming environment

Dates of development

From 2011-01-01 to 2013-12-31


Is managed by
Andrew Sorensen   (Researcher)


Phone: +61 7 3138 0452


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Published - Open Access