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q researchers have recommended that instead of having an access list associated with each file specifying which users can access the file and how we
q consider a system that holds 5000 users presume that you want to allow 4990 of these users to be able to access one filea how would you denote this
q in some systems a subdirectory is able to be read and written by an authorized user just as ordinary files can bea explain the protection problems
q give an instance of an application in which data in a file should be accessed in the following ordera sequentiallyb randomlyanswera print the
q describe the purpose of the open and close operationsanswer the open operation notifies the system that the named file is about to become active
q could you replicate a multilevel directory structure with a single-level directory structure in which arbitrarily long names can be used if your
q likewise some systems support many types of structures for a files data while others simply support a stream of bytes what are the merits in
q why do some systems stay track of the type of a file while others leave it to the user or simply dont implement multiple file types which system is
q a number of systems automatically delete all user files when a user logs off or a job terminates unless the user explicitly requests that they be
q we have an os operating system for a machine that uses base and limit registers however we have modified the machine to provide a page table can
q consider the demand-paged computer system where the level of multiprogramming is currently fixed at four the system was recently deliberate to
q segmentation is alike to paging but uses variable-sized pages describe two segment-replacement algorithms based on fifo and lru page replacement
q you have devised a fresh page-replacement algorithm that you think may be optimal in a few contorted test cases beladys anomaly occurs is the
q suppose that you want to utilize a paging algorithm that requires a reference bit such as second-chance replacement or working-set model however
q consider the two-dimensional array aint a new int100100whereas a 00 is at location 200 in a paged memory system with pages of size 200 a little
q an operating system sustains a paged virtual memory using a central processor with a cycle time of 1 microsecond it costs an additional one
q when virtual memory is executed in a computing system there are convinced costs associated with the technique and certain benefits list the
q which of the subsequent programming techniques and structures are good for a demand-paged environment which arent good describe your answersa
q presume that you have a page-reference string for a process with m frames initially all empty the page-reference string has length p along with n
q under what conditions do page faults occur explain the actions taken by the operating system when a page fault occursanswer a page fault take
what is refresh buffer identify the content and organisation of the refresh buffer for the case of raster display and vector
let us say we have a list of 10 animal objects called quotanimalsquot in alice write the code to move them forward synchronously by 1
a transperent switch is inserted between two local area networks abc and xyznetwork abc has workstation 12and 3 and network xyz has workstation 45
what are domain constraints a domain is a set of values that might be assigned to an attribute all
what is trigger triggers are statements that are executed automatically by the system as the side effect of a modification to the