Most operating systems support the concept of record locking, which means that individual records within any given file may be locked, thereby increasing the number of concurrent update processes. Process B has now written its stale account-balance value to the file, causing the changes made by process A to be lost.Process B, which still has the original stale value for the account balance in its copy of the customer record, updates the account balance and writes the customer record back to the file.Process A changes the account balance in its copy of the customer record and writes the record back to the file.
Process B now reads the same record from the same file, so it has its own copy. Process A reads a customer record from a file containing account information, including the customer's account balance and phone number. The following example illustrates the interceding update problem: Systems implement locking to prevent the classic interceding update scenario, which is a typical example of a race condition, by enforcing the serialization of update processes to any given file. JSTOR ( February 2015) ( Learn how and when to remove this template message)įile 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 to prevent reading of the file while it's being modified or deleted. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Please let us know if you continue to have any issues.This article needs additional citations for verification. These steps should improve DirectX Software playback latency as well as enable Presentation Mixer Exclusive Mode. Select the "Advanced" tab then make sure "Allow applications to take exclusive control of this device" is checked. Ensure that "Enable EAX Effects" is unchecked.ģ) Open Control Panel | Sound, then select "Speakers Creative SB X-Fi" and click "Properties". 
Check the "Enable Bit-Matched Playback" checkbox. Check the "Disable Sound Blaster enhancements" checkbox. Open Control Panel | Sound, then select "Speakers Creative SB X-Fi" and click "Properties". 1) Please ensure you have the latest driver installed from the creative labs website.Ģ) Please ensure you are in "Bit-Matched Playback" mode, which turns off all effects.
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