/*      $OpenBSD: spinlock.c,v 1.2 2020/04/06 00:01:08 pirofti Exp $    */
/* Paul Irofti <paul@irofti.net>, 2012. Public Domain. */

#include <stdio.h>
#include <stdlib.h>

#include <errno.h>
#include <pthread.h>
#include <unistd.h>

#include "test.h"

void *
foo(void *arg)
{
        int rc = 0;
        pthread_spinlock_t l = (pthread_spinlock_t)arg;
        rc = pthread_spin_trylock(&l);
        if (rc != 0 && rc != EBUSY) {
                PANIC("pthread_trylock returned %d", rc);
        }
        if (rc == 0) {
                CHECKr(pthread_spin_unlock(&l));
        }
        CHECKr(pthread_spin_lock(&l));
        CHECKr(pthread_spin_unlock(&l));
        return NULL;
}

int main()
{
        int i;
        pthread_t thr[10];
        pthread_spinlock_t l;

        _CHECK(pthread_spin_init(&l, PTHREAD_PROCESS_SHARED), == ENOTSUP,
            strerror(_x));

        CHECKr(pthread_spin_init(&l, PTHREAD_PROCESS_PRIVATE));
        for (i = 0; i < 10; i++) {
                printf("Thread %d started\n", i);
                CHECKr(pthread_create(&thr[i], NULL, foo, (void *)l));
        }
        for (i = 0; i < 10; i++) {
                CHECKr(pthread_join(thr[i], NULL));
        }
        CHECKr(pthread_spin_destroy(&l));

        SUCCEED;
}