#include <lunaix/ds/semaphore.h>
#include <lunaix/sched.h>

void sem_init(struct sem_t *sem, unsigned int initial) {
    sem->counter = ATOMIC_VAR_INIT(initial);
}

void sem_wait(struct sem_t *sem) {
    while (!atomic_load(&sem->counter)) {
        schedule();
    }
    atomic_fetch_sub(&sem->counter, 1);
}

void sem_post(struct sem_t *sem) {
    atomic_fetch_add(&sem->counter, 1);
    // TODO: wake up a thread
}