CODEWITHSUNDEEP
c#synchronization
imak
imak

Reputation: 6699

What is the point of using a non-static local variable in a lock?

A couple of times I have came across this code where a local variable in a class ( its NOT a static variable) has been used in a lock.

 public class SomeClass
{
    private object obj = new object();
    ....
    ....
    lock(obj)
    {

    }
}

Is there any point of locking given that its an instance variables?

Upvotes: 6

Views: 1172

Answers (2)

Jeffrey L Whitledge
Jeffrey L Whitledge

Reputation: 59523

A static lock would be useful for controlling access to a static variable. An instance lock would be useful for controlling access to an instance variable.

There is no point at all in using a local lock object to protect a local variable (unless it is a captured outer variable of an anonymous function or in an iterator), since other threads will not have access to either the lock or the variable.

Upvotes: 5

jason
jason

Reputation: 241751

Is there any point of locking given that its an instance variables?

Multiple threads could be acting on the same instance and a lock is needed for thread-safety. Think, for example, of a shared queue.

Upvotes: 14

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