Is MailboxProcessor a replacement for locks?

Question

I slowly studied all the functions that F # brings to the table. I was particularly interested MailboxProcessor.

• The equivalent of this in C # is likely to use locks. Can it be considered a MailboxProcessorreplacement for locks?
• In the following example, am I doing something particularly naive or can you see everything that can be improved?

module Tcp =
    open System
    open System.Collections.Generic
    open System.Net
    open System.Net.Sockets
    open System.Threading    

    type SocketAsyncMessage =
        | Get of AsyncReplyChannel<SocketAsyncEventArgs>
        | Put of SocketAsyncEventArgs
        | Dispose of AsyncReplyChannel<MailboxProcessor<SocketAsyncMessage>>

    type SocketAsyncEventArgsPool(size:int) =             
        let agent = 
            lazy(MailboxProcessor.Start(
                    (fun inbox ->
                        let references = lazy(new List<SocketAsyncEventArgs>(size))       
                        let idleReferences = lazy(new Queue<SocketAsyncEventArgs>(size))                    
                        let rec loop () = 
                            async {
                                let! message = inbox.Receive()
                                match message with
                                | Get channel -> 
                                    if idleReferences.Value.Count > 0 then
                                        channel.Reply(idleReferences.Value.Dequeue())
                                    else    
                                        let args = new SocketAsyncEventArgs()
                                        references.Value.Add args
                                        channel.Reply args  
                                    return! loop()
                                | Put args ->
                                    if args = null then
                                        nullArg "args" 
                                    elif references.Value.Count < size then
                                        idleReferences.Value.Enqueue args
                                    else                                       
                                        if not(references.Value.Remove args) then
                                            invalidOp "Reference not found."                                        
                                        args.Dispose() 
                                    return! loop()
                                | Dispose channel ->
                                    if references.IsValueCreated then
                                        references.Value 
                                        |> Seq.iter(fun args -> args.Dispose())
                                    channel.Reply inbox 
                            }
                        loop())))

        /// Returns a SocketAsyncEventArgs instance from the pool.         
        member this.Get () =
            agent.Value.PostAndReply(fun channel -> Get channel)            
        /// Returns the SocketAsyncEventArgs instance to the pool. 
        member this.Put args =
            agent.Value.Post(Put args)
        /// Releases all resources used by the SocketAsyncEventArgsPool.
        member this.Dispose () =
            (this:>IDisposable).Dispose()  

        interface IDisposable with
             member this.Dispose() =
                if agent.IsValueCreated then
                    (agent.Value.PostAndReply(fun channel -> Dispose channel):>IDisposable).Dispose()

Answer 1

Mailboxes (and similar designs) are used in programming models that do not use locks, as they are built into asynchronous processing. (The absence of a common volatile state is another requirement of this model).

Actor -, , . - . , , .

( OO-, , ), concurrency . - () , .

F #, , . , , , ( ). , , .

Answer 2

:

MailboxProcessor , . MailboxProcessor , .

locks/mutexes/ipc.