Login or Register to Ask a Question and Join Our Community


What is on Your Mind?

Line 2238 Unix V6 Comment: You are not expected to understand this.

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
The Lounge What is on Your Mind? Line 2238 Unix V6 Comment: You are not expected to understand this.
# 1  
Old 04-29-2009
Line 2238 Unix V6 Comment: You are not expected to understand this.
Here is the famous line 2238 of Unix V6 which is part of some of the most delicate parts of the kernel, context switching.

This comment received huge publicity and just may be the the most famous source code comment in computing history.

Code:
2230	/*
2231	 * If the new process paused because it was
2232	 * swapped out, set the stack level to the last call
3333	 * to savu(u_ssav).  This means that the return
2235	 * actually returns from the last routine which did
2236	 * the savu.
2237	 *
2238	 * You are not expected to understand this.
2239	 */
2240	if(rp->p_flag&SSWAP) {
2241		rp->p_flag =& ~SSWAP;
2242		aretu(u.u_ssav);
2243	}

Ref: Unix Sixth Edition Kernel Source Code, © Western Electric Company
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Echo printing a line in 2 lines; expected to print in one line

Dear All, fileName: therm.txt nc3h7o2h 7/27/98 thermc 3h 8o 2 0g 300.000 5000.000 1390.000 41 1.47017550e+01 1.71731699e-02-5.91205329e-06 9.21842570e-10-5.36438880e-14 2 -2.99988556e+04-4.93387892e+01 2.34710908e+00 4.34517484e-02-2.65357553e-05 3 ... (7 Replies)
Discussion started by: linuxUser_
7 Replies

2. Shell Programming and Scripting

How to comment a specific line of a file?

Hi, I need to comment out (insert # in the front of a line) a line that has entry Defaults requiretty using command-line as I need to do this on hundreds of servers. From Defaults requiretty To #Defaults requiretty I tried something like below but no luck: Please advise,... (3 Replies)
Discussion started by: prvnrk
3 Replies

3. Shell Programming and Scripting

Removing the sas comment line using UNIX

I have tried a lot, Need your help guys. SAS Program: data one ; /* Data step */ Input name $; /*Dec variables*/ I want to remove the commented part(/* Data step */) alone. I have tried using sed command but it is deleting the entire line itself. i need unix command to separate this and... (6 Replies)
Discussion started by: saaisiva
6 Replies

4. Shell Programming and Scripting

comment a line of the patterns is a the beginning of the line

I need to comment the lines starting with pattern "exclude" or "exclude=". If the work exclude comes at any other part, ignore it. Also, ignore, excludes, excluded etc. Ie only comment the line starting with exclude. File contents. exclude exclude= hi I am excluded excludes excludes= ... (9 Replies)
Discussion started by: anil510
9 Replies

5. Shell Programming and Scripting

Comment a line with SED

I have around 25 hosts and each hosts has 4 instance of jboss and 4 different ip attached to it . I need to make some changes to the startup scripts. Any tips appreciated. I have total of 100 instances which bind to 100 different ip address based on instance name. For example File1 ... (1 Reply)
Discussion started by: gubbu
1 Replies

6. Shell Programming and Scripting

How To comment a line where a word exists

Hi All Can u help me.. My problem is comment (#) a line where a word exists in that line sample: cat /tmp/file.txt monitor 192.168.1.11 Copying files in current directory 1 monitor 192.168.1.1 Copying files in current directory 2 monitor 192.168.1.12 Copying files in current... (2 Replies)
Discussion started by: darren_j
2 Replies

7. Shell Programming and Scripting

Using sed to comment out line in /etc/vfstab

I am running a script remotely to do the following 1. Kill all processes by a user 2. Uninstall certain packages 3. FTP over a new file 4. Kill a ldap process that is not allowing my /devdsk/c0t0d0s7 slice to un-mount 5. Unmount /h 6. comment out the slice in vfstab 7. newfs the... (9 Replies)
Discussion started by: deaconf19
9 Replies

8. UNIX for Dummies Questions & Answers

how to replace a text of line with a comment line

I want to replace this line : "test compare visible] true" and make it "#test compare visible] true". How can I do it ? And it should be checked in many sub folder files also. (6 Replies)
Discussion started by: manoj.b
6 Replies

9. Shell Programming and Scripting

Placing a comment at the beginning of a line

Hello - I am running Linux. I want to place a comment char at the beginning of a line in a file. For example: testvar=`grep username /etc/people sed -e 's/$testvar/#$testvar/g' /etc/people I cannot get the above commands to put a comment at the beginning of the line. Any... (3 Replies)
Discussion started by: mlike
3 Replies

10. Programming

remove single-line comment

Does anyone knows how to write a program to remove single-line comment in C program? that means it don't read anything behind // (3 Replies)
Discussion started by: Icy002
3 Replies
Login or Register to Ask a Question

LEARN ABOUT MOJAVE

xml::libxml::comment5.18

XML::LibXML::Comment(3) 				User Contributed Perl Documentation				   XML::LibXML::Comment(3)

NAME

       XML::LibXML::Comment - XML::LibXML Comment Class

SYNOPSIS

	 use XML::LibXML;
	 # Only methods specific to Comment nodes are listed here,
	 # see XML::LibXML::Node manpage for other methods

	 $node = XML::LibXML::Comment->new( $content );

DESCRIPTION

       This class provides all functions of XML::LibXML::Text, but for comment nodes. This can be done, since only the output of the node types is
       different, but not the data structure. :-)

METHODS

       The class inherits from XML::LibXML::Node. The documentation for Inherited methods is not listed here.

       Many functions listed here are extensively documented in the DOM Level 3 specification (<http://www.w3.org/TR/DOM-Level-3-Core/>). Please
       refer to the specification for extensive documentation.

       new
	     $node = XML::LibXML::Comment->new( $content );

	   The constructor is the only provided function for this package. It is required, because libxml2 treats text nodes and comment nodes
	   slightly differently.

AUTHORS

       Matt Sergeant, Christian Glahn, Petr Pajas

VERSION

       2.0110

COPYRIGHT

       2001-2007, AxKit.com Ltd.

       2002-2006, Christian Glahn.

       2006-2009, Petr Pajas.

LICENSE

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.18.2							    2014-02-01						   XML::LibXML::Comment(3)