Download An introduction to parallel programming by K. Mani Chandy;Chandy;Stephen Taylor PDF

By K. Mani Chandy;Chandy;Stephen Taylor

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This call defines the value of x to be 5 and y to be 3. Thus the first guard is true and the result is defined to be 3, as expected. Choice Composition: Selects a single composition. If any guard Gi is true, then the associated composition Ci is executed. If all guards a false, then the composition is skipped. Choice composition terminates when either Ci terminates or all guards are false. Now consider a call minimum(ux,3,result) where the value ux is not defined and thus it is not possible to decide if either guard is true.

Thus, eventually, the last program is able to execute and defines the result value to be 3. The entire program terminates when no further programs remain to be executed. There is one subtle aspect of the program execution that we need to consider further. Consider step 2: What ensures that this program selection is not repeatedly chosen forever preventing program termination? The answer lies in a concept called fairness. Our strategy for executing programs obeys the rule that if a program can execute, it will execute eventually.

We will return to this point again in Chapter 3 when describing programs that build and manipulate lists and/or trees. Definition Variables: Are initially undefined and are defined to be equivalent to a value by a definition statement; the value may be a number, string, variable, expression, tuple or list. Page 11 Finally, there are some definitions that simply do not make sense. For example, we should not place boxes inside themselves or, rather, define variables in terms of themselves. 2 Why Bother with Boxes?

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