typedef struct { ... } SilcAtomic16;

    The atomic operation structure given as argument to all atomic
    operation functions.  It hols the actual 16-bit atomic variable.

    SilcAtomic16 refcnt;

    // Initialize atomic variable
    silc_atomic_init16(&refcnt, 0);

    ...
    // Increment referene counter
    silc_atomic_add_int16(&refcnt, 1);
    ...

    // Uninitialize atomic variable
    silc_atomic_uninit16(&refcnt);