  In this work we consider the evolution of the interactive dark fluids in the
background of homogeneous and isotropic FRW model of the universe. The dark
fluids consist of a warm dark matter and a dark energy and both are described
as perfect fluid with barotropic equation of state. The dark species interact
non-gravitationally through an additional term in the energy conservation
equations. An autonomous system is formed in the energy density spaces and
fixed points are analyzed. A general expression for the deceleration parameter
has been obtained and it is possible to have more than one zero of the
deceleration parameter. Finally, vanishing of the deceleration parameter has
been examined with some examples.
