Mercurial > hg > Papers > 2022 > matac-thesis

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\ No newline at end of file
--- a/paper/text/chapter2.tex	Sun Jan 23 22:55:43 2022 +0900
+++ b/paper/text/chapter2.tex	Tue Jan 25 00:24:37 2022 +0900
@@ -68,11 +68,30 @@
 \end{figure}

 \section{Context}
-Contextは全てのCodeGear，DataGearを参照することができるMetaDataGearで
-従来OSのプロセスに相当する．
-OS全体のContextを管理するKernel Contextやユーザープログラムごとに存在するUser Contextなどがある．
-ノーマルレベルのCodeGearがContextを直接参照してしまうと，メタレベルを切り分けた意味がなくなってしまう．
-そのためContextは必ずMetaDataGearとしてMetaCodeGearから参照される．
+ContextはGearsOS上全てのCodeGear，DataGearの参照を持ち，CodeGearとDataGearの接続に用いられる．
+OS上の処理の実行単位で，従来のOSにおけるプロセスに相当する機能であるといえる．
+CodeGearをDataGearの一種であると考えると，
+ContextはGearの概念ではMetaDataGearに当たる．
+Contextはノーマルレベルから直接参照されず，必ずMetaDataGearとしてMetaCodeGearから参照される．
+ノーマルレベルのCodeGearがContextを直接参照してしまうと，
+メタレベルを切り分けた意味がなくなってしまうためである．
+
+図\ref{fig:context}はContextを参照する流れを表したものである．
+まずCodeGearがOutputDataGearへデータをoutputし，次のstubCodeGearへContextを参照しgotoを行う．
+この際直接参照はせず，goto metaを経由しgotoを行う．
+stubCodeGearはInputDataGear(前のCodeGearのOutputDataGear)とOutputDataGearを参照し，次のCodeGearへgotoを行う．
+CodeGearでの処理後，OutputDataGearへデータをoutputし，次のstubCodeGearへgotoを行う．
+
+Contextはいくつかの種類に分けることができる．
+OS全体のContextを管理するKernel Contextやユーザープログラムごとに存在するUser Context，
+CPUやGPUごとに存在するCPU Contextがある．
+\begin{figure}[h]
+  \begin{center}
+      \includegraphics[width=100mm]{figs/context.png}
+  \end{center}
+  \caption{Contextを参照する流れ}
+  \label{fig:context}
+\end{figure}

 \chapter{Christie}
 Christieは当研究室で開発を行っているJavaで記述された分散フレームワークである．
@@ -109,6 +128,9 @@
 動的topologyは参加を表明したノードに対し，自動的に配線を行う．

 \chapter{UnixのFileSystem}
+\section{xv6}
+MITで教育用の目的で開発されたOSで，基本的なUnixの構造を持つ．
+
 \section{inode}
 主にUnix系のファイルシステムで用いられる，ファイルの属性情報が書かれたデータである．
 inodeにおけるファイルの属性情報は表\ref{table:inode}のようなものがある．
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