When Should I Use the `volatile` Keyword in C# and When Should I Use Locks Instead?

In the application scenario of

keywords volatile In C#,

Keywords are important tools for managing memory access in multi -threaded applications. It ensures that the value of the variable is always the latest, even if other threads are visiting it.

volatile According to Eric Lippert, the "

" in C# not only prevent the code sorting and the register cache optimization, but also indicates that the processor ensures the latest value, even if this needs to synchronize the main memory with the cache.

volatile However, The guarantee provided by read and write is weaker than synchronous primitives such as locks. They actually do not guarantee that all processors stop updating the cache, but only guarantee the order of memory access before and after reading and writing. Therefore, Lippert strongly recommends not to use the

field, and emphasize the risk of inconsistent memory when multiple threads access the same value without correct synchronization.

volatile On the contrary, the lock should be used to ensure consistent memory reading and modification, and ensure that there is only one thread to access a specific memory location at a time. Under normal circumstances, the lock -up field is more desirable, unless the use of lock is a very specific scene of major performance problems. volatile

To understand more deeply, please refer to the following resources:

volatile

Understand the influence of low -locking technology in multi -threaded applications

Farewell to volatile

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