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What are the issues related to concurrency?

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Non-atomic: Operations that are non-atomic but interruptible by multiple processes can cause problems.

Race conditions: A race condition occurs of the outcome depends on which of several processes gets to a point first.

Blocking: Processes can block waiting for resources. A process could be blocked for a long period of time waiting for input from a terminal. If the process is required to periodically update some data, this would be very undesirable.

Starvation: It occurs when a process does not obtain service to progress.

Deadlock: It occurs when two processes are blocked and hence neither can proceed to execute

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