Volatile, Interlocked, or Lock: Which is Best for Thread-Safe Counter Increments/Decrements?

The increase/reduction operation of the thread safety counter:

, , and volatile Comparison Interlocked lock In a multi -threaded environment, protecting the shared data structure is vital to ensure the integrity of data to ensure data integrity and prevent competition conditions. When dealing with the shared integer counter that requires atomic increases or reduction operations, it is important to choose the most appropriate methods in the three methods of

,

and volatile. Interlocked lock

:

volatile The field is marked as to provide visibility between all threads to prevent CPU optimization and re -sorting memory access. However, this itself is not enough to force the counter to perform atomic operations.

Only ensure that all threads can see the latest value, but it cannot prevent data competition that may occur during incremental/reduced operations.

volatile volatile :

Use Objects to synchronize the lock before accessing the shared data and release the lock later. This method ensures that there are no other threads to access the counter when updating the counter in the current thread. Although it effectively ensures atomicity, due to the synchronization mechanism, locking may introduce performance overhead. lock

:

lock

Atomic operations specifically designed for concurrent scenes.

Methods perform atomic incremental operation on the specified shared variables to ensure that multiple threads can safely increase the counter without causing data damage. This method effectively combines reading and writing operations into a single inseparable operation, making it the preferred method of atomic incremental/reduction scenario. Interlocked Conclusion:

In view of the needs of increasing or decreasing the needs of the combination counter in a multi -threaded environment, it is recommended to use Interlocked. This method provides a thread -safe atomic operation without locking performance effects, and relying on Interlocked.Increment() to provide more effective solutions than

. Nevertheless, when visible is the main point, for example, to ensure that the changes made by a thread are immediately visible to other threads, and

still have its own use.

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