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How can I ensure that only one instance of a script is running at a time (mutual exclusion)?

April 26, 2017ensure exclusion instance running Script time

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How can I ensure that only one instance of a script is running at a time (mutual exclusion)?

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We need some means of mutual exclusion. One way is to use a “lock”: any number of processes can try to acquire the lock simultaneously, but only one of them will succeed.