if (err != 0) {
		fatalf("pthread_create failed: %s", strerror(err));
	}
}

extern void crosscall_s390x(void (*fn)(void), void *g);

static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	free(v);

	// Save g for this thread in C TLS
	setg_gcc((void*)ts.g);

	crosscall_s390x(ts.fn, (void*)ts.g);
	return nil;