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/*
* myth_barrier.c --- test barrier
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
pthread_barrier_t b[1];
typedef struct {
long id;
long n_threads;
long n;
long * a;
} arg_t;
void * f(void * arg_) {
arg_t * arg = (arg_t *)arg_;
long id = arg->id;
long n_threads = arg->n_threads;
long n = arg->n;
long * a = arg->a;
long t;
for (t = 0; t < n; t++) {
a[id] = t + 1;
pthread_barrier_wait(b);
long j;
for (j = 0; j < n_threads; j++) {
assert(a[j] == t + 1);
}
pthread_barrier_wait(b);
}
return 0;
}
int main(int argc, char ** argv) {
long n_threads = (argc > 1 ? atol(argv[1]) : 1000);
long n = (argc > 2 ? atol(argv[2]) : 1000);
pthread_t tids[n_threads];
long * a = (long *)calloc(sizeof(long), n_threads);
arg_t * args = (arg_t *)calloc(sizeof(arg_t), n_threads);
arg_t arg = { -1, n_threads, n, a };
long i;
pthread_barrier_init(b, 0, n_threads);
for (i = 0; i < n_threads; i++) {
args[i] = arg;
args[i].id = i;
int r = pthread_create(&tids[i], 0, f, &args[i]);
assert(r == 0);
}
for (i = 0; i < n_threads; i++) {
pthread_join(tids[i], 0);
}
for (i = 0; i < n_threads; i++) {
if (a[i] != n) {
printf("NG: a[%ld] = %ld != %ld\n", i, a[i], n);
return 1;
}
}
printf("OK\n");
free(a);
return 0;
}
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