Is there a "try to block, skip if time-out" operation in C #?

Question

I need to try to lock the object, and if it is already locked, just continue (after or without a timeout).

The C # lock statement blocks.

Answer 1

I believe you can use Monitor.TryEnter() .

The lock statement is simply converted to a call to Monitor.Enter() and a try catch .

Answer 2

Ed got the right function for you. Just remember to call Monitor.Exit() . You must use a try-finally block to ensure that it cleans properly.

 if (Monitor.TryEnter(someObject)) { try { // use object } finally { Monitor.Exit(someObject); } } 

Answer 3

I had the same problem, I ended up creating a TryLock class that implements IDisposable, and then uses the using statement to control the lock area:

 public class TryLock : IDisposable { private object locked; public bool HasLock { get; private set; } public TryLock(object obj) { if (Monitor.TryEnter(obj)) { HasLock = true; locked = obj; } } public void Dispose() { if (HasLock) { Monitor.Exit(locked); locked = null; HasLock = false; } } } 

And then use the following syntax to lock:

 var obj = new object(); using (var tryLock = new TryLock(obj)) { if (tryLock.HasLock) { Console.WriteLine("Lock acquired.."); } } 

Answer 4

You will probably find out now when others have pointed you in the right direction, but TryEnter can also accept a timeout parameter.

Jeff Richter "CLR Via C #" is a great book about the details of the internal properties of the CLR if you find yourself in more complex things.

Answer 5

Consider using AutoResetEvent and its WaitOne method with a timeout.

See https://msdn.microsoft.com/en-us/library/system.threading.autoresetevent(v=vs.110).aspx and https://msdn.microsoft.com/en-us/library/cc190477 (v = vs. 110) .aspx