init commit

Copyright Yuanle Song (c) 2016

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    * Redistributions of source code must retain the above copyright

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    * Redistributions in binary form must reproduce the above

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      disclaimer in the documentation and/or other materials provided

      with the distribution.

    * Neither the name of Yuanle Song nor the names of other

      contributors may be used to endorse or promote products derived

      from this software without specific prior written permission.

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recreate the program in Raymond's talk using haskell

Raymond Hettinger Keynote — Python Russia Keynote documentation

https://dl.dropboxusercontent.com/u/3967849/pyru/_build/html/index.html

import Distribution.Simple

main = defaultMain

name:                queue-base-threading

version:             0.1.0.0

synopsis:            Initial project template from stack

description:         Please see README.md

homepage:            https://github.com/sylecn/queue-base-threading#readme

license:             BSD3

license-file:        LICENSE

author:              Yuanle Song

maintainer:          sylecn@gmail.com

copyright:           Copyright: (c) 2016 Yuanle Song

category:            Utilities

build-type:          Simple

extra-source-files:  README.md

cabal-version:       >=1.10

executable seq

  main-is:             sequential.hs

  ghc-options:         -threaded -rtsopts -with-rtsopts=-N

  build-depends:       base

  default-language:    Haskell2010

executable try1

  main-is:             try1.hs

  ghc-options:         -threaded -rtsopts -with-rtsopts=-N

  build-depends:       base

                     , random

  default-language:    Haskell2010

source-repository head

  type:     git

  location: https://github.com/sylecn/queue-base-threading

import Control.Monad

import Control.Concurrent.MVar

import Text.Printf

incrementAndPrint :: MVar Integer -> IO ()

incrementAndPrint counter = do

  newCount <- modifyMVar counter (\i -> return (i + 1, i + 1))

  printf "The count is %d\n" newCount

  putStrLn "---------------"

main :: IO ()

main = do

  putStrLn "Starting up"

  counter <- newMVar 0

  replicateM_ 10 (incrementAndPrint counter)

  putStrLn "Finishing up"