Function rt_slab_page_alloc

src/slab.c:216–246

* @brief Alloc memory size by page. * * @param m the slab memory management object. * * @param npages the number of pages. */

 * @param npages the number of pages.
 */
void *rt_slab_page_alloc(rt_slab_t m, rt_size_t npages)
{
    struct rt_slab_page *b, *n;
    struct rt_slab_page **prev;
    struct rt_slab *slab = (struct rt_slab *)m;

    if (npages == 0)
        return RT_NULL;

    for (prev = &slab->page_list; (b = *prev) != RT_NULL; prev = &(b->next))
    {
        if (b->page > npages)
        {
            /* splite pages */
            n       = b + npages;
            n->next = b->next;
            n->page = b->page - npages;
            *prev   = n;
            break;
        }

        if (b->page == npages)
        {
            /* this node fit, remove this node */
            *prev = b->next;
            break;
        }
    }

    return b;
}

/**
 * @brief Free memory by page.