By Egon Börger, Robert Stärk
Quelli che s'innamoran di pratica senza scienzia sono come 'l nocchieri ch'entra in navilio sanza timone o bussola, 1 che mai ha certezza dove si vada. - Leonardo da Vinci Ich habe oft bemerkt, dass wir uns durch
allzuvieles Symbolisieren 2 die Sprache fu ¨r die Wirklichkeit untu ¨chtig machen. - Christian Morgenstern this is often where to precise our thank you. to begin with we thank all those that through the years have actively contributed
to shaping the radical software program layout and research strategy defined during this booklet. they're too a variety of to be pointed out the following. all of them seem ultimately or the opposite at the following pages, specifically within the bibliographical
and ancient Chap. nine that are learn independently of the e-book. We then thank those that have helped with distinctive serious reviews at the draft chapters to form the way in which our arguments are provided during this booklet: M. B¨
orger (Diron Mu ¨nster), I. Craggs (IBMHursley),G. DelCastillo(SiemensMunc ¨ hen),U. Gl¨ asser(SimonFraser collage, Vancouver,Canada),J. Huggins(Kettering University,Michigan, USA), B. Koblinger (IBM Heidelberg), P. Pa
¨ppinghaus (Siemens Munc ¨ hen), A. Preller (Universit´ e de Montpellier, France), M. -L. Potet (INP de Gre- ble, France),W. Reisig (Humboldt-Universit¨ at zu Berlin, Germany),H. Rust (Universit¨ at Cottbus, Germany), G.
Schellhorn (Universit¨ at Augsburg, G- many), B. Thalheim (Universit¨ at Cottbus, Germany) and a dozen scholar generationsat Universita `di Pisa. We thankM. Barmet(ETH Zur ¨ ich)for her suggestions of the routines in Chap. 8.
We additionally thank L.
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Additional info for Abstract state machines..A method for high-level system design and analysis
Pre-emption means that values which were scheduled on the driver for time points ≥ currTime + time1 are deleted; it can be defined explicitly by a function |< , which for given driver and time t retains precisely the driver elements (’transactions’) with time component < t. This results in the TRANSPORT driver update by driver (P , S ) |
For example, the complex signal assignment S ← INERTIAL . . with inertial delay in the hardware design language VHDL’93 can be defined operationally by the simple rule below taken from [111, Sect. 2], using separately defined explicit as well as recursive external functions. The meaning of the inertial delay instruction S ← INERTIAL exp1 AFTER time1 , . . , expn AFTER timen extends the simpler TRANSPORT delay which preemptively schedules for signal S on the driver (P , S ) of process P each value val (expi ) for time currTime + timei .
The dynamic functions are further divided into four subclasses. e. functions f which appear in at least one rule of M as the leftmost function (namely in an update f (s) := t for some s, t) and are not updatable by the environment (or more generally by another agent in the case of a multi-agent machine). These functions are the ones which constitute the internally controlled part of the dynamic state of M . Monitored functions, also called in functions, are dynamic functions which are read but not updated by M and directly updatable only by the environment (or more generally by other agents).