Network shared memory framework for the BELLE data acquisition control system

We have developed a framework called network shared memory (NSM) to control the data acquisition of the Belle experiment at the KEK B-factory. The NSM provides a distributed shared memory, along with request and message type protocols. A synchronized operation of the data acquisition system is possible using the NSM framework. For central monitoring and recording, information on the detector conditions is collected using the shared memory from devices connected to a network segment. We have built a reliable system which has been successfully implemented into the Belle data acquisition scheme. It has been in full operation for half a year and we anticipate several years of successful running.