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10 February, 08:48

Consider a system consisting of processes P1, P2, ..., Pn, each of which has a unique priority number. Write a monitor that allocates three identical printers to these processes, using the priority numbers for deciding the order of allocation.

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  1. 10 February, 10:21
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    See explaination

    Explanation:

    The code

    type printer = monitor

    var P: array[0 ...2] of boolean;

    X: condition;

    procedure acquire (id: integer, printer-id: integer);

    begin

    if P[0] and P[1] and P[2] then X. wait (id)

    if not P[0] then printer-id : = 0;

    else if not P[1] then printer-id : = 1;

    else printer-id : = 2;

    P[printer-id]:=true;

    end;

    procedure release (printer-id: integer)

    begin

    P[printer-id]:=false;

    X. signal;

    end;

    begin

    P[0] : = P[1] : = P[2] : = false;

    end;

    Note:

    Monitors are implemented by using queues to keep track of the processes attempting to become active int he monitor. To be active, a monitor must obtain a lock to allow it to execute the monitor code. Processes that are blocked are put in a queue of processes waiting for an unblocking event to occur.
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