A detail information about
A detail information about what is acyclic graph. This content under the Creative Commons Attribution-ShareAlike License, all text used in this video is from wikipedia. I do not own it. I just make video out of this so that some people get some help.
To understand the Acyclic
To understand the Acyclic graph directory structure ,its advantages see the complete series File System Implementation https://www.youtube.com/playlist?list=PLskQvPDUk0sKgGGReUz7nMwYkDTbevUC1
File System Interface https://www.youtube.com/playlist?list=PLskQvPDUk0sLsU1Vv5jSr-P-1yTt0AqdJsee the complete series File System Implementation https://www.youtube.com/playlist?list=PLskQvPDUk0sKgGGReUz7nMwYkDTbevUC1
File System Interface https://www.youtube.com/playlist?list=PLskQvPDUk0sLsU1Vv5jSr-P-1yTt0AqdJ
see the complete series Operating System-process synchronization at https://www.youtube.com
Operating System-Memory Management
Suppose two users are working on a joint project .Thus one file or directory containing some file has to be shared between the two users. Let all such files to be shared are stored in a subdirectory and the directory is placed in userA's user level directory. Now userB also need access to the subdirectory. In the tree structure we know that to access these files userB should either use the path name or should change directory to be userA's directory. But here the requirement is userB should be able to access these files or this subdirectory from his own directory. What about maintaining a copy of this directory in userb s directory.Here but the changes made by one user will not be visible to the other user.
Thus here the requirement is both the user should be able to access the same file or the same subdirectory from their own directories. This is made possible using the acyclic graph directory structure. So any changes made by one user will be immediately visible to the other user.
Thus acyclic graph structure is used whenever a file or a common subdirectory should be shared.A shared file or sub directory will appear in the filesystem in two places at a time.
Shared files and subdirectories can be implemented in several ways. In some systems it is implemented as a soft link where there is a file at some location with the actual file entry in a directory containing all the information regarding the file with a pointer pointing to the actual location of the file and a link from another directory to the file which is actually pointing to the real filename .Thus whenever a reference is made to this file from this directory rsearch the directory .if the directory entry is identified as a softlink the name of the real file or directory is identified and the link is resolved by using the real path name to locate the real file.
In some system it is implemented as a hard link where there is a file at some actual disc location with a file entry in its directory containing all the information regarding the file and a pointer pointing to the file .And if there is a hard Link from another directory to the file this link will be similar to this file entry containing all the information regarding the file with a pointer pointing to the exact location of the file.
Thus acyclic graph directory structure is more flexible than the tree directory structure.
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In this video we are speaking the word, acyclic. Do take note of how acyclic is spelled.
The definition of acyclic is listed below the word in the video.
Acyclic: Botany Not cyclic. Used especially of flowers whose parts are arranged in spirals rather than in whorls, as in magnolias.
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Current Word ID: 11146