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

static int xxx(float f)
{
	if(f <= 0.0){
		printf("wrong f!: %f\n", f);
		return -1;
	}

	return 0;
}

static void *fun(void *arg)
{
	float f = 5.0;

	for(;;){
		if(xxx(f) < 0)
			abort();
	}

	return NULL;
}

int main()
{
	pthread_t t1, t2;

	pthread_create(&t1, NULL, fun, NULL);
	pthread_create(&t2, NULL, fun, NULL);

	pthread_join(t1, NULL);
	pthread_join(t2, NULL);

	return 0;
}