Abstract
This paper presents a process oriented, discrete event, distributed
simulation package that is based on the Virtual Time mechanism. Virtual
Time can be characterised as an optimistic, loosely-coupled, distributed
synchronisation algorithm. The package is loosely modelled around
Demos [Birtwistle, 79a], a general purpose discrete event simulation
package written in Simula [Birtwistle, 79b]. Active components of a
simulation are completely independent and are called entities.
Communication between entities is accomplished through a system of
shared "conditions". When one entity wishes to communicate with another
it "signals" the appropriate condition to the other entity. A harbour
simulation is developed to illustrate the features of this
simulation package.
