Problem 2. Use compare_and_swap(), an atomic hardware instr

Problem 2. Use compare_and_swap(), an atomic hardware instruction… Problem 2. Use compare_and_swap(), an atomic hardware instruction to fix the race condition and solve the critical section problem in the code given below.  void push(int item) {               if (top < SIZE) {                      stack[top] = item;              // LINE A                      top++;                                // LINE B              }              else                    ERROR //no return or exit } int pop() {                    if (top > 0) {                       top–;                                        // LINE X                       return stack[top];                    // LINE Y               }                 else {                          ERROR //no return or exit                          return -1;                 } } a.  Write  C statement to declare and initialize a shared variable lockTop, whose value is -1 when unlocked and 0 when locked b. Re-write the push() function to call the compare_and_swap() function defined in the PPT Slide 3.18 c. Re-write the pop() function to call the compare_and_swap() function defined in the PPT Slide 3.18 (Hint: other than the end of a function, the return statement also deserves some attention.) d. Does this solution satisfy the mutual-exclusion requirement? Does it satisfy the bounded-waiting requirement? here is slide 3.18Image transcription textcompare_and_swap: an Atomic Hardware Instruction Definition: int compare and swap (int *value, int expected,int new value) { int temp = *value; if (*value == expected) *value = new value; return temp; 1. Executedatomically 2. Returns the original value of passed parameter “value” 3. Set the variable … Show more… Show more Engineering & Technology Computer Science CS 3600

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