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File locking is a mechanism that restricts access to a computer file, or to a region of a file, by allowing only one user or process to modify or delete it at a specific time, and preventing reading of the file while it's being modified or deleted.
To allow several users to edit a database table at the same time and also prevent inconsistencies created by unrestricted access, a single record can be locked when retrieved for editing or updating. Anyone attempting to retrieve the same record for editing is denied write access because of the lock (although, depending on the implementation ...
Optimistic locking: this allows multiple concurrent users access to the database whilst the system keeps a copy of the initial-read made by each user. When a user wants to update a record, the application determines whether another user has changed the record since it was last read.
This enables users to be treated temporarily as root (or another user). The set group ID, setgid, or SGID permission. When a file with setgid is executed, the resulting process will assume the group ID given to the group class. When setgid is applied to a directory, new files and directories created under that directory will inherit their group ...
Monitoring your recent login activity can help you find out if your account has been accessed by unauthorized users. Review your recent activity and revoke access to suspicious entries using the info below. Remove suspicious activity. From a desktop or mobile browser, sign in and visit the Recent activity page. Depending on how you access your ...
Wikipedia does not use pre-emptive software article locks on pages, because this would be contrary to the policies of Wikipedia and spirit of openness. Page protection is never to be used for closing down an article's normal development and community editing, and should be used only to prevent actual disruption.
Learn how to manage everything that concerns your AOL Account starting with your AOL username, password, account security question and more.
Try another web browser - If you can access your account in another browser, the problem isn't with your account; you'll need to fix the issue in your preferred browser. Someone changed your password - An unauthorized party could have broken in and changed your password. Use the Sign-in Helper to get back into your account and change your password.