Introduction to PEARL: Process and Experiment Automation by Wulf Werum, Hans Windauer (auth.)

By Wulf Werum, Hans Windauer (auth.)

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The task OUTPUT takes one message from the buffer and outputs it to the terminal in a certain format. In order to enable a correct flow of operations, they have to be co-ordinated as follows: OUTPUT works only in the case, when a message was buffered that means that OUTPUT is possibly waiting for further feeding by PRODUCERl or PRODUCER2. PRODUCERl and PRODUCER2 can only buffer a message if no previously buffered message is put out by OUTPUT, that means that they possibly have to be delayed until a complete message is put out by OUTPUT.

G. bit strings, determining the type of this variable. ) This type has to be determined by the declaration of a variable together with its identifier. Example: Declaration of a variable X of the type real. DECLARE X FLOAT; Variables are declared on module level, in procedures or in tasks. On module level declared variables are known throughout the whole module; each task and procedure of the module can use them within expressions or change their values in assignments by indication of their identifiers.

However, as all the PEARL objects at module level may be used or (where possible) amended within the body of a task, information can be passed between tasks by means of data at module level or by means of I/O instructions. 4. Example: A task LOG transfers a text to the variable TEXT, which must be transmitted to a terminal by the task OUTPUT. (The necessary synchronization instructions are described in paragrar PROBLEM; DCL TEXT a-tAR (60); LOG: TASK; determination of the text transfer to TEXT , END· OUTPUT: TASK; output of the value of TEXT EJIV·, The general form of a task declaration is as follows: task-declaration ::= identifier: TASK (f priority f) (f resident-attribute f) (f global-attribute f) ; task-body END; 36 I ".

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