Programming: Process Synchronization I Implement a thread-sa…
Questions
Prоgrаmming: Prоcess Synchrоnizаtion I Implement а thread-safe function called find_maximum that finds and records the maximum value in some portion of an array. The array will be given as a global variable called ’data’. Threads will receive the start and end indices where they should work, and they should update the global “max” variable. If needed, you may add code in a global scope (region 1), or before the function (region 3). Useful Functions Linux Description int pthread_mutex_init(pthread_mutex_t *mutex, pthread_mutexattr_t *attr); initialize a mutex int pthread_mutex_lock(pthread_mutex_t *mutex); lock a mutex int pthread_mutex_unlock(pthread_mutex_t *mutex); unlock a mutex struct thread_info { int start, end; }; #define LENGTH 6 int data[] = { ... }; //some array defined here. int max = -1; //TODO REGION 1: (if needed) implement this. void find_maximum(void* val) { struct thread_info *info = (struct thread_info *) val; int start = info->start; int end = info->end; //TODO REGION 2: implement this. must be thread safe! } void main() { pthread_t tids[2]; struct thread_info ti1, ti2; ti1.start = 0; ti1.end = LENGTH/2 - 1; ti2.start = LENGTH/2; ti2.end = LENGTH-1; //TODO REGION 3: (if needed) implement this. pthread_create(&tids[0], NULL, find_maximum, &ti1); pthread_create(&tids[1], NULL, find_maximum, &ti2); pthread_join(tids[0], NULL); pthread_join(tids[1], NULL); printf("max: %i", max); //max in data after threads have looked at each side }
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