F# lock function with System.Threading.Lock

Question

.NET 9 introduced a new Lock object (System.Threading.Lock). The C# 13 compiler has also been made able to recognize when the lock keyword is used with such a class instance, producing the correct code.

What about the F# lock function? Does it also automatically recognise the new System.Threading.Lock?

Currently I am using is with a function

let lock9 (lock: System.Threading.Lock) (f: unit -> 't) = 
    let scope = lock.EnterScope()
    try f()
    finally scope.Dispose()

F# use or using cannot be currently used as scope does not implement IDisposable

Brian Berns · Accepted Answer · 2025-03-02 23:15:49Z

4

There's an open issue in the F# language repository for this, so I think the answer is currently no. There are some suggestions in the comments for how to add support in your own codebase, if you want to.

answered Mar 2 at 23:15

Brian Berns

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