Function _lwp_shmrm

components/lwp/lwp_shm.c:229–254

Free the shared pages, the shared-memory structure and its binary tree node_key. */

/* Free the shared pages, the shared-memory structure and its binary tree node_key. */
static int _lwp_shmrm(int id)
{
    struct lwp_avl_struct *node_key = RT_NULL;
    struct lwp_avl_struct *node_pa = RT_NULL;
    struct lwp_shm_struct* p = RT_NULL;
    uint32_t bit = 0;

    node_key = shm_id_to_node(id);
    if (!node_key)
    {
        return -1;
    }
    p = (struct lwp_shm_struct *)node_key->data;
    if (p->ref)
    {
        return 0;
    }
    bit = rt_page_bits(p->size);
    rt_pages_free((void *)p->addr, bit);
    lwp_avl_remove(node_key, &shm_tree_key);
    node_pa = node_key + 1;
    lwp_avl_remove(node_pa, &shm_tree_pa);
    rt_free(node_key);
    shm_id_free(id);
    return 0;
}

/* A wrapping function, free the shared memory with interrupt disabled. */
int lwp_shmrm(int id)