RE: rfork() and copy on write

Yes and no.  The child has the same image as the parent (as in fork) and
any changes made by either don't effect the other (the copy of write
semantic).  So the semantics of rfork at identical to fork.  However,
the implementation is to copy all the pages to the new node so the
parent and child are not physically sharing the same page.

Hope that helps,
  bruce
 

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jack
de Valpine
Sent: Tuesday, April 18, 2006 9:22 AM
To: [email protected]
Subject: [SSI-users] rfork() and copy on write

Hi,

I just want to understand the following. In a normal call to fork(), a
child process gets started and gets a copy of the parents memory space. 
Does rfork work in an analogous manner? So if the parent process is
started on node 1 for example and then rforks off a series of children
onto nodes 2 and 3 is the memory shared on a copy on write basis?

Thanks,

-Jack de Valpine

--
# Jack de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction




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