作者: Frank L. Perazzoli , James W. Kelly , David N. Cutler
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摘要: An object based operating system for a multitasking computer provides objects which represent the architecture or interrelationships of systems's resources. Access to certain is required in order use corresponding resources system. All have consistent data structure, and method defining operations apply each type object. As result, it relatively easy add new types The supports multiple levels visibility, allowing be operated on only by processes with object's range visibility. This allows made private process, shared all within job, visible an entire set can moved higher visibility level when need shared. In addition, access controlled through control list specifies authorized object, that are allowed. restricted associated "privileged operation", thereby restricting privileged operation those user Waitable used synchronize one more another specified events. routines generating waitable without modifying system's kernel.