CODEWITHSUNDEEP
c#multithreadingstaticinterlocked
testCoder
testCoder

Reputation: 7385

Should I use static fields and interlocked together?

Should I use static fields and interlocked together, in cases when i need to provide thread safety and atomic operations with static fields, Is static fields are atomic by default? For example:

Interlocked.Increment(ref Factory.DefectivePartsCount);

Thanks.

Upvotes: 4

Views: 1460

Answers (2)

Tudor
Tudor

Reputation: 62439

static doesn't guarantee anything in terms of thread-safety. Hence, an increment will still not be atomic even if the variable is static. As such, you will still need to use classic synchronization mechanisms depending on the situation. In your case Interlocked.Increment is fine.

Upvotes: 1

Henk Holterman
Henk Holterman

Reputation: 273244

Yes.

The field (assuming Int32) is atomic, not because it's static but because it's 32 bits.

How ever, Factory.DefectivePartsCount += 1 requires a read and a write action on the variable so the whole operation is not thread-safe.

Upvotes: 5

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