Process Synchronization and Data Communication between Processes in Real Time Local Area Networks

摘要

This thesis extends the multi-computer real-time executive, MCORTEX. The multiple cluster system RTC (Real Time Cluster Star), consisting of clusters of single board computers (INTEL iSBC 86/12A), which are connected via an Ethernet Local Area Network, serves as a hardware basis for the implementation of extended MCORTEX. The extension upgrades MCORTEX to system-wide synchronization and general data communication between any processes in the system. An intercluster shared memory model is developed, that partially replicates intracluster shared memory, such that shared data replication is minimized and the system's processing speed is maximized. This implementation, by transmitting produced shared data to all consuming clusters as soon as possible after procuction, guarantees that only cluster local hits occur in the system. Shared memory space is used efficiently by transmitting shared data to consuming clusters only, and by the abiltity to store shared data contiguously in intracluster shared memory. Keywords include: Distributed processing; MULTIBUS; CP/M-86; Ethernet; Local Area Network; Shared Memory; Process Synchronization; Data communication. (Theses)