Shared resource locking controls
Ralf Wagner · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1982
The author describes how to synchronize input/output operations directed to a shared peripheral unit, such as a direct-access storage device (DASD), in a multiple host processor environment in a more efficient manner in terms of the number of accesses and the level of granularity than the reserve/release of the individual data storage unit.