![]() ![]() The following main procedure uses the procedures defined in Figure 11.2 saddtistener (print pdate ( 294 Lee & Seshia action to Embedded Syste. Whenever the value changes the observer needs to be notified so that it can update the display on the screen. For example, the value of x might be displayed by an observer on a screem. 1994) In this paten, an update procedure changes the value of a variuble x Observers (which are other programs or other parts of the program) will be mo ified whenever x is changed by calling a callback peocedure. C is an imperative langae Eample I1.1: In this chapler, we illustale several kcy pis ng the example C program shown in Figure 11.2 This program implements a commonly wsed design pattern called the ebserver pattern (Gamma ctall. MEMORY ARCHITECTURES printf ("%d", b) main (void) foo (a)i a-1 s int main (void) Is it true or false that the value of a passed to foo will always be 2? Explain Assume that this is the entire program, that this program is stored in persistent memory, and that the program is executed on a bare-iron microcontroller each time a reset button is pushed.Įnable models of concurent compositions of sach sequential peograms We then progress to discuss threads, processes, and message passing, which are three styles of composition 11.1 Imperative Programs called an impertive language. ![]() Consider the following program: I int a-2 2 void foo (int b) ( 258 Lee &Seshia, Introduction to Embedded Systems 9. ![]()
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