PROCESS MANAGEMENT AND EVENT SCHEDULING IN SIMDL SIMULATION LANGUAGE

SIMDL is a discrete event simulation language based on concurrent processes with a predefined form and task. A generator type process creates transactions of a model and the transactions are moved from one user defined queue to another under the control of server processes. This paper describes the internal organization of SIMDL simulation system, its process management technique and event scheduling algorithm. SIMDL's process management and event scheduling techniques are inspired from operating system concepts related to concurrent processes. The ready list is an activation list used to record process activations in chronological order. Two primitives "insert}activation}list" and "delete}activation}list" are designed to schedule processes. When a model is compiled the code generated is a pseudo code of a software machine having a stack architecture. The instruction set contains instructions especially developed for simulation purposes.