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// Jack Sangdahl
// CSCI3753 SP24
// PA4 Shared Array
#include "array.h"
int array_init(array *q) {
q->head = 0;
q->tail = 0;
pthread_mutex_init(&q->lock, NULL);
sem_init(&q->avail, 0, ARRAY_SIZE);
sem_init(&q->empty, 0, 0);
return 0;
}
int array_put(array *q, char *hostname) {
sem_wait(&q->avail);
pthread_mutex_lock(&q->lock);
q->data[q->tail++] = hostname;
q->tail %= ARRAY_SIZE;
pthread_mutex_unlock(&q->lock);
sem_post(&q->empty);
return 0;
}
int array_get(array *q, char **hostname) {
sem_wait(&q->empty);
pthread_mutex_lock(&q->lock);
*hostname = q->data[q->head++];
q->head %= ARRAY_SIZE;
pthread_mutex_unlock(&q->lock);
sem_post(&q->avail);
return 0;
}
void array_free(array *q) {
pthread_mutex_destroy(&q->lock);
sem_destroy(&q->avail);
sem_destroy(&q->empty);
}
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