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

void *f(void *p)
{
	static int init;
	static pthread_mutex_t m;
	pthread_mutexattr_t ma;
	if (!init) {
		init = 1;
		pthread_mutexattr_init(&ma);
		pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK);
		pthread_mutex_init(&m, &ma);
		pthread_mutex_lock(&m);
		pthread_mutexattr_destroy(&ma);
		return 0;
	}
	if (!pthread_mutex_unlock(&m)) {
		printf("unlocked mutex via false ownership\n");
		exit(1);
	}
	return 0;
}


int main()
{
	int i;
	pthread_t td;
	for (i=0; i<100000; i++) {
		pthread_create(&td, 0, f, 0);
		pthread_join(td, 0);
	}
	return 0;
}