os_labs/lab11/vector-try-wait.c

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2020-06-11 15:16:58 +10:00
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mythreads.h"
#include "main-header.h"
#include "vector-header.h"
int retry = 0;
void vector_add(vector_t *v_dst, vector_t *v_src) {
top:
if (pthread_mutex_trylock(&v_dst->lock) != 0) {
goto top;
}
if (pthread_mutex_trylock(&v_src->lock) != 0) {
retry++;
Pthread_mutex_unlock(&v_dst->lock);
goto top;
}
int i;
for (i = 0; i < VECTOR_SIZE; i++) {
v_dst->values[i] = v_dst->values[i] + v_src->values[i];
}
Pthread_mutex_unlock(&v_dst->lock);
Pthread_mutex_unlock(&v_src->lock);
}
void fini() {
printf("Retries: %d\n", retry);
}
#include "main-common.c"