typedef struct { ... } SilcAtomic32;

    The atomic operation structure given as argument to all atomic
    operation functions.  It hols the actual 32-bit atomic variable.

    SilcAtomic32 refcnt;

    // Initialize atomic variable
    silc_atomic_init32(&refcnt, 0);

    ...
    // Increment referene counter
    silc_atomic_add_int32(&refcnt, 1);
    ...

    // Uninitialize atomic variable
    silc_atomic_uninit32(&refcnt);