#include <stdatomic.h>

void
memory_barrier (void)
{
    atomic_thread_fence (memory_order_acq_rel);
}
int
atomic_add (atomic_int *i)
{
    return atomic_fetch_add_explicit (i, 1, memory_order_relaxed);
}
int
mutex_trylock (atomic_flag *m)
{
    return atomic_flag_test_and_set_explicit (m, memory_order_acquire);
}
void
mutex_unlock (atomic_flag *m)
{
    atomic_flag_clear_explicit (m, memory_order_release);
}

int
main (void)
{
    return 0;
}