CODEWITHSUNDEEP
c#multithreading
ckv
ckv

Reputation: 10838

C# Locking on object or reference? How do you answer this?

Lets say we want to achieve thread synchronization and we use lock for this. But if a question is asked is the lock on the object or on the reference, How do we answer this question?

private static readonly object doSomethingLock = new object();
public static void DoSomething (SomeObject o) 
{
   lock(doSomethingLock) 
   {
       o.Update();
       // etc....
   }
}

Upvotes: 0

Views: 122

Answers (2)

ChrisF
ChrisF

Reputation: 137188

That lock is on the use of that object in that static method, not on the object globally.

If another thread tries to call that method it will be blocked until the first thread completes it's call.

It won't stop some other method accessing that object elsewhere in your code, but as long as the only access to the object is inside the lock then it's equivalent to locking the object.

Upvotes: 2

adv12
adv12

Reputation: 8551

The lock is on the object. Your code is equivalent to this code:

private static readonly object doSomethingLock = new object();
public static void DoSomething (SomeObject o) 
{
   var sameObject = doSomethingLock;
   lock(sameObject) 
   {
       o.Update();
       // etc....
   }
}

Upvotes: 5

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