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Engineering · Computer Science
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Embedded System Programming

You have 2 functions.


bool ReleaseExamSemaphore(void) {
    bool out;
    out = AcquireExamSemaphore(false);
    return out;
}

bool AcquireExamSemaphore(bool ResOrRel) {
bool check = true;
   storage_class bool s=0;

    switch (ResOrRel){
        case 0:
            s = 0;
        break;
        case 1:
            while (check){
                while (s);                // wait for zero
       
              
                Xil_ExceptionDisable();       
                if (s == false)            // no one has changed during execution of last 2 lines ?
                {
                    s = true;
                    check = false;            // no we’ve got it
                };
               
                Xil_ExceptionEnable();        
            }
            break;
    }

    return s;
}

Whic are correct answer, select one or more.

a. storage_class should include class: volatile

b. storage_class should include class: extern

c. storage_class should include class: auto

d. storage_class should include class: register

e. storage_class should include class: static

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