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ManyProc

Demonstration of the manyproc sample from Erlang using F# MailboxProcessor.

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module ManyProc

open System.Diagnostics

type OK = OK
type Agent<'T> = MailboxProcessor<'T>

let spawn f howManyMore pid = 
    Agent<OK>.Start(fun inbox -> async {
        let! _ = Async.StartChild <| f howManyMore pid
        let! _ = inbox.Receive()
        ()
    })

let rec startProc howManyMore (pid: Agent<OK>) =
    async {
        match howManyMore, pid with
        | 0, pid -> pid.Post OK
        | howManyMore, pid ->
            let newPid = spawn startProc (howManyMore - 1) pid
            newPid.Post OK
    }

let start howMany f =
    let pid =
        Agent<OK>.Start(fun inbox -> async {
            let! _ = inbox.Receive()
            f()
        })
    startProc howMany pid

let startAndTime howMany =
    let stopwatch = Stopwatch.StartNew()
    let callback() =
        stopwatch.Stop()
        printfn "Completed in %i ms" stopwatch.ElapsedMilliseconds
    start howMany callback |> Async.StartImmediate
module ManyProc
namespace System
namespace System.Diagnostics
Multiple items
union case OK.OK: OK

--------------------
type OK = | OK

Full name: ManyProc.OK
type Agent<'T> = MailboxProcessor<'T>

Full name: ManyProc.Agent<_>
Multiple items
type MailboxProcessor<'Msg> =
  interface IDisposable
  new : body:(MailboxProcessor<'Msg> -> Async<unit>) * ?cancellationToken:CancellationToken -> MailboxProcessor<'Msg>
  member Post : message:'Msg -> unit
  member PostAndAsyncReply : buildMessage:(AsyncReplyChannel<'Reply> -> 'Msg) * ?timeout:int -> Async<'Reply>
  member PostAndReply : buildMessage:(AsyncReplyChannel<'Reply> -> 'Msg) * ?timeout:int -> 'Reply
  member PostAndTryAsyncReply : buildMessage:(AsyncReplyChannel<'Reply> -> 'Msg) * ?timeout:int -> Async<'Reply option>
  member Receive : ?timeout:int -> Async<'Msg>
  member Scan : scanner:('Msg -> Async<'T> option) * ?timeout:int -> Async<'T>
  member Start : unit -> unit
  member TryPostAndReply : buildMessage:(AsyncReplyChannel<'Reply> -> 'Msg) * ?timeout:int -> 'Reply option
  ...

Full name: Microsoft.FSharp.Control.MailboxProcessor<_>

--------------------
new : body:(MailboxProcessor<'Msg> -> Async<unit>) * ?cancellationToken:System.Threading.CancellationToken -> MailboxProcessor<'Msg>
val spawn : f:('a -> 'b -> Async<'c>) -> howManyMore:'a -> pid:'b -> MailboxProcessor<OK>

Full name: ManyProc.spawn
val f : ('a -> 'b -> Async<'c>)
val howManyMore : 'a
val pid : 'b
val inbox : MailboxProcessor<OK>
val async : AsyncBuilder

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.async
Multiple items
type Async
static member AsBeginEnd : computation:('Arg -> Async<'T>) -> ('Arg * AsyncCallback * obj -> IAsyncResult) * (IAsyncResult -> 'T) * (IAsyncResult -> unit)
static member AwaitEvent : event:IEvent<'Del,'T> * ?cancelAction:(unit -> unit) -> Async<'T> (requires delegate and 'Del :> Delegate)
static member AwaitIAsyncResult : iar:IAsyncResult * ?millisecondsTimeout:int -> Async<bool>
static member AwaitTask : task:Task<'T> -> Async<'T>
static member AwaitWaitHandle : waitHandle:WaitHandle * ?millisecondsTimeout:int -> Async<bool>
static member CancelDefaultToken : unit -> unit
static member Catch : computation:Async<'T> -> Async<Choice<'T,exn>>
static member FromBeginEnd : beginAction:(AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg:'Arg1 * beginAction:('Arg1 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg1:'Arg1 * arg2:'Arg2 * beginAction:('Arg1 * 'Arg2 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg1:'Arg1 * arg2:'Arg2 * arg3:'Arg3 * beginAction:('Arg1 * 'Arg2 * 'Arg3 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromContinuations : callback:(('T -> unit) * (exn -> unit) * (OperationCanceledException -> unit) -> unit) -> Async<'T>
static member Ignore : computation:Async<'T> -> Async<unit>
static member OnCancel : interruption:(unit -> unit) -> Async<IDisposable>
static member Parallel : computations:seq<Async<'T>> -> Async<'T []>
static member RunSynchronously : computation:Async<'T> * ?timeout:int * ?cancellationToken:CancellationToken -> 'T
static member Sleep : millisecondsDueTime:int -> Async<unit>
static member Start : computation:Async<unit> * ?cancellationToken:CancellationToken -> unit
static member StartAsTask : computation:Async<'T> * ?taskCreationOptions:TaskCreationOptions * ?cancellationToken:CancellationToken -> Task<'T>
static member StartChild : computation:Async<'T> * ?millisecondsTimeout:int -> Async<Async<'T>>
static member StartChildAsTask : computation:Async<'T> * ?taskCreationOptions:TaskCreationOptions -> Async<Task<'T>>
static member StartImmediate : computation:Async<unit> * ?cancellationToken:CancellationToken -> unit
static member StartWithContinuations : computation:Async<'T> * continuation:('T -> unit) * exceptionContinuation:(exn -> unit) * cancellationContinuation:(OperationCanceledException -> unit) * ?cancellationToken:CancellationToken -> unit
static member SwitchToContext : syncContext:SynchronizationContext -> Async<unit>
static member SwitchToNewThread : unit -> Async<unit>
static member SwitchToThreadPool : unit -> Async<unit>
static member TryCancelled : computation:Async<'T> * compensation:(OperationCanceledException -> unit) -> Async<'T>
static member CancellationToken : Async<CancellationToken>
static member DefaultCancellationToken : CancellationToken

Full name: Microsoft.FSharp.Control.Async

--------------------
type Async<'T>

Full name: Microsoft.FSharp.Control.Async<_>
static member Async.StartChild : computation:Async<'T> * ?millisecondsTimeout:int -> Async<Async<'T>>
member MailboxProcessor.Receive : ?timeout:int -> Async<'Msg>
val startProc : howManyMore:int -> pid:Agent<OK> -> Async<unit>

Full name: ManyProc.startProc
val howManyMore : int
val pid : Agent<OK>
member MailboxProcessor.Post : message:'Msg -> unit
val newPid : MailboxProcessor<OK>
val start : howMany:int -> f:(unit -> unit) -> Async<unit>

Full name: ManyProc.start
val howMany : int
val f : (unit -> unit)
val pid : MailboxProcessor<OK>
val startAndTime : howMany:int -> unit

Full name: ManyProc.startAndTime
val stopwatch : Stopwatch
Multiple items
type Stopwatch =
  new : unit -> Stopwatch
  member Elapsed : TimeSpan
  member ElapsedMilliseconds : int64
  member ElapsedTicks : int64
  member IsRunning : bool
  member Reset : unit -> unit
  member Restart : unit -> unit
  member Start : unit -> unit
  member Stop : unit -> unit
  static val Frequency : int64
  ...

Full name: System.Diagnostics.Stopwatch

--------------------
Stopwatch() : unit
Stopwatch.StartNew() : Stopwatch
val callback : (unit -> unit)
Stopwatch.Stop() : unit
val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn
property Stopwatch.ElapsedMilliseconds: int64
static member Async.StartImmediate : computation:Async<unit> * ?cancellationToken:System.Threading.CancellationToken -> unit
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More information

Link:http://fssnip.net/kT
Posted:3 years ago
Author:Ryan Riley
Tags: agent , mailboxprocessor