Re: Copy-on-Write

["Manish Katiyar" <mkatiyar@gmail.com>]

On Feb 6, 2008 11:19 AM, Rick Brown <rick.brown.3@gmail.com> wrote:
> Hi,
>
> I had read that the operating systems that use copy-on-write mechanism
> for fork(), it is better if they deliberately allow the CHILD to run
> first.
>
> This would be better because in 99% of the cases child will call
> exec() and the new address space will be allocated. Instead if the
> parent is executes first, an unnecessary copy of the pages is made (if
> parents writes) and later on when child executes, a fresh address
> space is executed.
>
> So in linux, is a child run first or the parent? Can we rely on this
> information?

No with fork() it is not guaranteed.......however if you use vfork()
child is guaranteed to run first......

>
> TIA
>
> Rick
>
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