A vacation model for the non-saturated Readers and Writers system with a threshold policy

The non-saturated Writers and Readers system with threshold service policy is a general situation of the classical Writers and Readers problem. It considers the case where both Writers and Readers have thresholds for beginning of service. This paper sets up two vacation models for the Writers and Readers, respectively. Since the dependency between Writers and Readers is approximated, this model system is an approximation. The numerical results compared with the simulation results show that this vacation model system approximates the non-saturated Writers and Readers problem very well.