Function rt_smem_free

src/mem.c:497–539

* @brief This function will release the previously allocated memory block by * rt_mem_alloc. The released memory block is taken back to system heap. * * @param rmem the address of memory which will be released. */

 * @param rmem the address of memory which will be released.
 */
void rt_smem_free(void *rmem)
{
    struct rt_small_mem_item *mem;
    struct rt_small_mem *small_mem;

    if (rmem == RT_NULL)
        return;

    RT_ASSERT((((rt_uintptr_t)rmem) & (RT_ALIGN_SIZE - 1)) == 0);

    /* Get the corresponding struct rt_small_mem_item ... */
    mem = (struct rt_small_mem_item *)((rt_uint8_t *)rmem - SIZEOF_STRUCT_MEM);
    /* ... which has to be in a used state ... */
    small_mem = MEM_POOL(mem);
    RT_ASSERT(small_mem != RT_NULL);
    RT_ASSERT(MEM_ISUSED(mem));
    RT_ASSERT(rt_object_get_type(&small_mem->parent.parent) == RT_Object_Class_Memory);
    RT_ASSERT(rt_object_is_systemobject(&small_mem->parent.parent));
    RT_ASSERT((rt_uint8_t *)rmem >= (rt_uint8_t *)small_mem->heap_ptr &&
              (rt_uint8_t *)rmem < (rt_uint8_t *)small_mem->heap_end);
    RT_ASSERT(MEM_POOL(&small_mem->heap_ptr[mem->next]) == small_mem);

    LOG_D("release memory 0x%x, size: %d",
            (rt_uintptr_t)rmem,
            (rt_uintptr_t)(mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr)));

    /* ... and is now unused. */
    mem->pool_ptr = MEM_FREED(small_mem);
#ifdef RT_USING_MEMTRACE
    rt_smem_setname(mem, "    ");
#endif /* RT_USING_MEMTRACE */

    if (mem < small_mem->lfree)
    {
        /* the newly freed struct is now the lowest */
        small_mem->lfree = mem;
    }

    small_mem->parent.used -= (mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr));

    /* finally, see if prev or next are free also */
    plug_holes(small_mem, mem);
}
RTM_EXPORT(rt_smem_free);

#ifdef RT_USING_FINSH