Comparison between real time and time sharing operating system
Protection and security
• Protection refers to a mechanism for controlling the access of program s processes, or users to the resources defined by computer system.
• The concept of protection came with the advent of multiprogramming where several processes compete for the use of CPU.
• the purpose was to confine each users program to its assigned areaof memory so that the programs cannot interface and harm each other.
• Protection in main memory is particularly important because of address translation. The purpose of protection is to allow concurrently running process to share the common physical address space.
• Protection also ensure that only process that have gained proper authorization from the operating system can operate on memory segment , the CPU, files and other resources.
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