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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.
In computer science, mutual exclusion is a property of concurrency control, which is instituted for the purpose of preventing race conditions. It is the requirement that one thread of execution never enters a critical section while a concurrent thread of execution is already accessing said critical section, which refers to an interval of time ...
Acquire the control condition. If the owner is set and not the current thread, wait for the control condition to be notified (this also releases the condition). Set the owner to the current thread. The owner identifier should have already been cleared at this point unless the acquirer is already the owner.
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Click the Turn Off button. On the Turn Off Firewall confirmation dialog box, click the When do you want to resume Firewall drop-down menu, choose the appropriate option, and then click Turn Off. Click Done. Don't see the McAfee icon next to the clock? If you're using Windows 7 or 8, click the arrow next to the clock to reveal hidden icons.
To disable virus protection 1. On the Windows taskbar, next to the clock, double-click the McAfee ( M) icon. Note: If you are using Windows® 7 and don't see the McAfee icon next to the clock, click the arrow next to the clock to reveal hidden icons. Please know that you can customize your Windows 7 System Tray.
It provides exclusive access to the locked data. Other schemes also provide shared access for reading data. Other widely implemented access modes are exclusive, intend-to-exclude and intend-to-upgrade. Another way to classify locks is by what happens when the lock strategy prevents the progress of a thread.
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