Determine if only one instance is running: Difference between revisions
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=={{header|AutoHotkey}}== |
=={{header|AutoHotkey}}== |
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AutoHotkey has a #SingleInstance command. If you run two scripts that don't have it at the same time, it alerts the user. #SingleInstance FORCE closes the older instance when a newer one is run, and #SingleInstance IGNORE does nothing when you try to open a new instance of an already-running script. |
AutoHotkey has a #SingleInstance command. If you run two scripts that don't have it at the same time, it alerts the user. #SingleInstance FORCE closes the older instance when a newer one is run, and #SingleInstance IGNORE does nothing when you try to open a new instance of an already-running script. |
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=={{header|Bash Shell}}== |
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Using flock, exits 0 if you got the lock, otherwise exits 1, below is a simplified example: |
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<lang bbcbasic> |
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local fd=${2:-200} |
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# create lock file |
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eval "exec $fd>/tmp/my_lock.lock" |
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# acquire the lock, or fail |
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flock -nx $fd \ |
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&& # do something if you got the lock \ |
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|| # do something if you did not get the lock |
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</lang> |
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There's a nice program called singleton that wraps this in an easy to use package : https://github.com/krezreb/singleton |
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=={{header|BBC BASIC}}== |
=={{header|BBC BASIC}}== |
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