Many asynchronous programs make use of promises (also known as using light-weight threads or an asynchronous monad) to manage concurrency. I've been working on tools to collect trace data from such programs and visualise the results, to help with profiling and debugging. The diagram below shows a trace from a Mirage unikernel reading data from disk in a loop. You should be able to pan around by dr
How to test Async OCaml code 18 Sep 2014 In the previous blog post, we used Core and Async to write a tiny library for talking to Memcached using the binary protocol. I wanted to write tests for the library in a readable and succint manner to ensure correctness – the type system cannot ensure binary data is parsed correctly after all. The regular go-to tool for testing OCaml code is OUnit, but thi
This module provides a set of operations for running IO operations asynchronously and waiting for their results. It is a thin layer over the basic concurrency operations provided by Control.Concurrent. The main additional functionality it provides is the ability to wait for the return value of a thread, but the interface also provides some additional safety and robustness over using forkIO threads
4. ThreadよりもTask for (int i = 0; i < num; i++) { var t = new Thread(_ => b[i] = F(a[i]) ); } for (int i = 0; i < num; i++) { Task.Run(() => b[i] = F(a[i]) ); } ×悪い例 ○良い(まだマシ※な)例 データの数だけ スレッド作成 Threadでなく Task利用 ※ この場合、ParallelクラスやParallel.Enumerableクラスが使いやすい 5. ThreadよりもTask for (int i = 0; i < num; i++) { var t = new Thread(_ => b[i] = F(a[i]) ); } for (int i = 0; i < num; i++) { Task.Run(() => b[
Cloud Haskell is a library for distributed concurrency in Haskell. The purpose is to make it easier to write programs for clusters of machines. It provides a message passing communication model, inspired by and very similar to that of Erlang. Availability Cloud Haskell is available from Hackage as distributed-process. You will probably also want to install a backend: The distributed-process-simple
概要 （書きかけ） 「非同期処理」の話とからめて、 GUI アプリケーション開発と非同期処理の話。 GUI とディスパッチャー （書きかけ、清書時は別ページにするかも） 0.5秒固まったら「使いにくい」、3秒固まったら「バグだ」、10秒固まったら「パソコンが壊れた」と言われる。 ↑ 大げさかもしれないけど、かなり真実。 ・メッセージ ループ クリックとかキー ダウンのイベントは一度キューにたまってる（メッセージ ポンプ） ループでキューを見ては GUI の処理してるものがある。 WinForms とか WPF では隠ぺいされてるけども、内部的には、 while (GetMessage(ref msg, null, 0, 0)) { TranslateMessage(ref msg); DispatchMessage(ref msg); } DispatchMessage の内部で、最終的に
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