Polling substitution system for performing polling communications within a computer network

A polling substitution system comprising:

• a network for performing a communication;
• a shared unit for holding information resources, for assuring a use of the information resources in accordance with a request from outside said shared unit, and in the case where a polling request to confirm an operation is transmitted to a using side of said information resources and no response is obtained therefrom, for further releasing the information resources assured for said using side;
• a processing unit using the information resources of said shared unit via said network;
• a first communication control section for connecting said shared unit to said network, thereby establishing a communication connection with another unit including said processing unit on the basis of a communication request;
• a second communication control section for connecting said processing unit to said network, thereby establishing a communication connection with another unit including said shared unit on the basis of the communication request;
• a substitution response section, provided for said first communication control section, for processing a substitution response to the polling request from said shared unit on the basis of an exchange of a sync control message between said substitution response section and said second communication control section on said processing unit side via said network;
• and
• a substitution request section, provided for said second communication control section, for processing a polling substitution request to said processing unit on the basis of an exchange of the sync control message between said substitution request section and said substitution response section via said network.