[uml-devel] Regarding fork() implementation in UML

[uml-devel] Regarding fork() implementation in UML

[Krishnappa Abhijith-A21204]

[-- Attachment #1.1: Type: text/plain, Size: 508 bytes --]

Hi,
            SORRY for bugging you guys so much...
 Regarding fork() implementation in UML
 
I was going through the below code 
 
long sys_fork(void)
{
 long ret;
 
 current->thread.forking = 1;
 ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
        &current->thread.regs, 0, NULL, NULL);
 current->thread.forking = 0;
 return(ret);
}
 
Can pls let me know why current->thread.forking = 1 was done before
calling do_fork() and then reset after that ?
 
Regards,
Abhi


[-- Attachment #1.2: Type: text/html, Size: 2537 bytes --]

[-- Attachment #2: Type: text/plain, Size: 345 bytes --]

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV

[-- Attachment #3: Type: text/plain, Size: 194 bytes --]

_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Regarding fork() implementation in UML

[Jeff Dike]

On Thu, Mar 15, 2007 at 10:29:28PM +0800, Krishnappa Abhijith-A21204 wrote:
> Can pls let me know why current->thread.forking = 1 was done before
> calling do_fork() and then reset after that ?

If you look at copy_thread, you will see that there is different
treatment for kernel threads and processes, and thread.forking is used
to distinguish between them.

				Jeff

-- 
Work email - jdike at linux dot intel dot com

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel