Should I Use the Volatile Keyword in C# Multithreading, or Are Locks Always Better?

C# multi -thread programming: Use Volatile keywords with caution, the lock mechanism is more reliable

In C# multi -thread programming,

Keywords are often misunderstood and abused. This article will explore the application of and explain why it should usually be avoided.

volatile The definition and use of volatile volatile

Senior C# expert Eric Lippert pointed out that not only prevent the compiler from optimizing, but also instructs the processor to ensure the latest value, even if this will suspend other processors. However, this understanding is not complete.

The actual semantics of volatile

volatile

In fact, the semantics of read and write operations are more complicated. They do not guarantee the synchronization between all processors, but only provide weaker guarantees for the order of memory access. A stronger guarantee is implemented through thread creation, locking mechanism or use of

methods. Why avoid using the Volatile field?

Lippert is strongly recommended to avoid using the volatile field. They show that the multi -threaded problem is trying to deal with it without appropriate synchronization. The lock mechanism provides stronger memory consistency and the sequence of access. Interlocked

The speed of the lock mechanism is extremely rare. In addition, the risk of code errors due to misunderstandings about memory models is very high. Therefore, it is generally recommended to use the lock mechanism instead of the

field. More resources

volatile For more information, please refer to the following articles:

volatile The impact of understanding low -locking technology on multi -threaded applications

The alternative of the keyword of the volatile keyword

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