USENIX Technical Program - Abstract - 7th Tcl/Tk Conference - February 2000 ## Introducing QoS awareness in Tcl programming: QTcl Roberto Canonico, Maurizio D'Arienzo, Simon Pietro Romano, and Giorgio Ventre, Dipartimento di Informatica e Sistemistica, Universitˆ di Napoli "Federico II", Napoli, Italy ### Abstract A number of distributed applications require communication services with Quality of Service (QoS) guarantees. Among the actions undertaken by the Internet Engineering Task Force (IETF) with regard to the end-to-end QoS provisioning issue in the Internet, the definition of the Integrated Services (IntServ) framework plays a major role. According to this model, applications need to interact with network routers by means of a signalling protocol, RSVP. Even though special-purpose APIs have been defined to let applications negotiate QoS parameters across RSVP-capable networks, the integration of QoS negotiation mechanisms in the applications still remains an open issue. In modern programming, the Tcl scripting language plays a significant role, as it enables fast system prototyping by gluing basic components to build complex applications. In this paper we present QTcl, an extension of Tcl-DP which provides programmers with a new set of primitives, fully compliant with the SCRAPI programming interface for RSVP. We also present how QTcl has been used in an advanced VoD application to setup reservations in an IntServ network. USENIX Members may view the full text of this paper in HTML form and PDF form. (Use your membership number as the username for access.) If you need the latest Adobe Acrobat Reader, you can download it from Adobe's site. To become a USENIX Member, please see our Membership Information. Current USENIX Members may change their password.

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