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In software engineering, double-checked locking (also known as "double-checked locking optimization" [1]) is a software design pattern used to reduce the overhead of acquiring a lock by testing the locking criterion (the "lock hint") before acquiring the lock. Locking occurs only if the locking criterion check indicates that locking is required.
Generally, locks are advisory locks, where each thread cooperates by acquiring the lock before accessing the corresponding data. Some systems also implement mandatory locks, where attempting unauthorized access to a locked resource will force an exception in the entity attempting to make the access. The simplest type of lock is a binary ...
This approach does not work on multiprocessor systems where it is possible for two programs sharing a semaphore to run on different processors at the same time. To solve this problem in a multiprocessor system, a locking variable can be used to control access to the semaphore. The locking variable is manipulated using a test-and-set-lock command.
In concurrent programming, a monitor is a synchronization construct that prevents threads from concurrently accessing a shared object's state and allows them to wait for the state to change.
Lock, changes are disallowed until the user requests and receives an exclusive lock on the file from the master repository. Merge , users may freely edit files, but are informed of possible conflicts upon checking their changes into the repository, whereupon the version control system may merge changes on both sides, or let the user decide when ...
Josh Allen got the win and a warning from referee Bill Vinovich on Sunday in Buffalo's wild-card win over the Denver Broncos. With the Bills leading early in the third quarter, Buffalo ran a pass ...
Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 263 electoral votes and Romney at 206.
Laundry detergent sheets have gained popularity in recent years. You’ve probably seen ads for brands like Earth Breeze or Sheets Laundry Club, promising eco-friendly products, no mess usage, and ...