ReaderWriterLockSlim.EnterUpgradeableReadLock() Always A Deadlock?

Question

I\'m very familiar with ReaderWriterLockSlim but tried my hand at implementing EnterUpgradeableReadLock() recently in a class... Soon after I reali

Answer 1

You have an error in your example

private readonly ReaderWriterLockSlim _lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);

it should be

private static readonly ReaderWriterLockSlim _lock = new  ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);

Now in your code everytime a class is instantianed it is creating new instance of ReaderWriterLockSlim which is unable to lock anything because every single thread has it's own instance of it. Making it static will force all threads to use one instance which will work as it should