The resources such as CPU, memory, I/O channels are needed by all user jobs, and their allocation is handled automatically by the operating system. Some problems to be handled by the operating system are:
–Â Â Â Â Â Â Â Â Â mutual exclusion
–Â Â Â Â Â Â Â Â Â process synchronization,
–Â Â Â Â Â Â Â Â Â deadlock avoidance
–Â Â Â Â Â Â Â Â Â security and protection
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