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Define the DosExit Function used in the OS/2
DosExit(action, resultCode)
DosExit function is to be called when a thread or process is finished executing. If EXIT_THREAD is passed as an action code (action), the current thread ends. If EXIT_PROCESS is passed as an action code, all threads in the process end. The resultCode is used to pass exit state information back to any thread waiting with a DosWaitChild for this process to complete.
The optimal replacement policy, called OPT, is to evict the page which will be accessed farthest into the future. Since we can't predict the future precisely, we can't implement OP
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