#include <errno.h>
#include <limits.h>
#include <semaphore.h>
#include <stdatomic.h>

int sem_init(sem_t* sem, int pshared, unsigned value) {
    if (pshared) {
        errno = ENOSYS;
        return -1;
    }
    if (value > SEM_VALUE_MAX) {
        errno = EINVAL;
        return -1;
    }
    atomic_store(&sem->_s_value, value);
    atomic_store(&sem->_s_waiters, 0);
    return 0;
}