GC_API size_t GC_CALL GC_get_heap_size(void)
{
    /* ignore the memory space returned to OS (i.e. count only the      */
    /* space owned by the garbage collector)                            */
    return (size_t)(GC_heapsize - GC_unmapped_bytes);
}
GC_API size_t GC_CALL GC_get_heap_size(void)
{
     
     
    return (size_t)(GC_heapsize - GC_unmapped_bytes);
}