By Wulf Werum, Hans Windauer (auth.)

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Extra info for Introduction to PEARL: Process and Experiment Automation Realtime Language Description with Examples

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Region 2. region RELEASE 51,52; RELEASE 51,52; The sema variables may be listed in any order. ) The general rules for declaration of sema variables as well as for request and release statements are: sema-declaration ::= (DECLARE/DCL) one-identifier-or-list (f bound-list f) SEMA (f resident-attribute f) (j PRESET (I global-attribute f) i simple-integer-constant-denotation , •• 1f) ; 52 request-statement ::= REQUEST name§sema , •. ; release-statement ::= RELEASE name§sema , •. ; The possibility of arrays of sema-variables exists also.

G. in case of occurrence of an interrupt. The user manual has to define in detail the start procedure. Concerning the implementations of Werum, the task named START is started automatically by the PEARL system after having loaded the PEARL program. Connections between modules can be made by global objects (see part III, 6). 19 2. PROBLEM DATA When being executed a PEARL program uses and changes among other objects integers, reals, bit strings, character strings, clocks and durations. These problem data occur in form of constants or as values of variables.

ACTIVATE identifier§task 1) After the occurrence of an interrupt the task-statement is newly scheduled under consideration of the corresponding schedule. The old schedule gets invalid. 42 The general rule for starting a task is: activate-statement ::= (f schedule /) ACTIVATE identifier§task (f priority /) ; At the execution of such an activate-statement, the specified task applies either immediately (without schedule) for a processor or at the specified time determined by the schedule. This task competes with all other tasks, which apply at that time for the processor.

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