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sahaitong814
sahaitong814
28.06.2020 • 
Computers and Technology

Write all possible outputs of the following C program. Separate different possibilities clearly. Assume there will be no mutex or semaphore initialization, thread creation or joining failures. If you believe there is only one possible output, you just need to write that output. #include #include char arr [2]={'a','b']; int mark=0, size=0; pthread_mutex_t ml = PTHREAD_MUTEX_INITIALIZER; { void swap (int start, int end) { int i, j; for (i=start, j=mark;i<=end; i++) pthread_mutex_lock (&ml); arr[0]=arr[O] + (j82); arr[1]=arr[1]+(j82); pthread_mutex_unlock (&ml); } } void *fun (void *arg) { swap (mark, mark+size-1); mark=mark+size; } int main(int argc, char *argv[]) { int num_threads=2, i, x; size=14/num_threads; pthread_t thread[num_threads]; for( i = 0; i < num_threads; i++) x = pthread_create(&thread[i], NULL, fun, NULL); for( i = 0; i < num_threads; i++) pthread_join(thread[i], NULL); for(i=0;i<2;i++) printf("%c", arr[i]); return 0;

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