May 2024
Intermediate
248 pages
6h 59m
Japanese
Content preview from 図解まるわかり 仮想化のしくみ
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多様な言語で書かれたコードをネイティブコード並みの実行速度で動作
させることができ、安全性と可搬性を兼ね備えたWasmの登場により、ブ
ラウザ以外のさまざまな場所での活用が期待されるようになりました。し
かし、Wasmで実装されたアプリケーションはファイルやネットワークに
アクセスできません。Wasmアプリから OSのシステムコールを呼び出し、
ファイルへのアクセスを可能にする方法が必要ですが、システムコールは
OSごとに異なるため、実装しようとするとOSごとに異なるWasm アプリ
が必要になってしまいます。この問題を解消するために生まれた仕様が
「WebAssembly System Interface（WASI）」 です（図 12-9）。
WASIはWasmのバイナリからのOSのシステムコールを業界標準仕様
APIとして定義したものです。WASIに対応するWasmランタイムさえあ
れば、OSを問わずWasmアプリを動作させることができます。ディレク
トリなどのOSが管理するリソースへのアクセスをWASIが引き受けるこ
とで、OSの違いを吸収しています。
WasmアプリはWasmランタイムが提供されている主要なブラウザで動
作させることができますが、PCやサーバーで Wasmアプリのバイナリをそ
のまま実行させることはできません。動作させるためには、Wasmtimeや
Wasmerなどの Wasm ランタイムが必要です（図 12-10）。
両ランタイムはWASIをサポートしており、OS リソースにアクセス可能 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.