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By G. BIRTWISTLE

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Extra info for A System for Discrete Event Modelling on Simula

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Upon the heath. There to meet with Macbeth. This can be split into three below. (Asterisks represent 1 Witch. When shall we three meet again. In thunder, lightning or in rain? *Where * 2 Witch. ) the place? When the hurlyburly's done, When the battle's lost and won. * Upon the heath. * 3 Witch. That will be ere the set of sun. *There * to meet with Macbeth. The separate roles are sequences of active speaking phases and passive waits until it is one's turn again. In much the same way, when we come to describe a simulation The entity approach to modelling 25 model, we first split the totality into suitable components (cf.

It is then deleted from the event list. 0 ! 0) Finally then, the DEMOS block is re-entered. It automatically issues a final report before closing down the simulation. 40 Discrete Event Modelling On Simula Once an entity has been created and scheduled, it decides for itself what to do next until its action pattern has been exhausted. It is then said to be TERMINATED and can never be scheduled again. g. TUGS and JETTIES), the object is automatically deleted from the model. 0. Notice that the scheduling style, which is inherited from SIMULA, focusses our attention on CURRENT.

The labels DOCK, UNLOAD, LEAVE are not necessary are inserted as documentation aids. they REMARKS ON EXAMPLE 1 We create the first boat object by executing NEW BOAT("BOAT"). 7 (the DEMOS system automatically gives the boat objects a serial number, as shown). The ENTITY prefix contains the user-accessible procedure SCHEDULE and also the hidden mechanism for entry into and exit from the event list. This behind-the-scenes mechanism is intended to be used not directly, but indirectly through the standard scheduling procedures HOLD and SCHEDULE.

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