Re: [Boost-users] [interprocess] support for private mappings?

Subject: Re: [Boost-users] [interprocess] support for private mappings?
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2009-01-03 04:54:54

Zeljko Vrba wrote:
> On Sat, Jan 03, 2009 at 12:52:49AM +0100, Ion Gaztañaga wrote:
>> You can also use lower level mapped_region for copy-on-write file 
>> mappings using mode_t = copy_on_write.
>>
> Cool, thank you!
> 
> So the following should work (I'm not using managed SHM)?
> 
> file_mapping	fm_("myfile", read_only);
> mapped_region	mr_(fm_, copy_on_write);

It should, because that's the way open_copy_on_write 
managed_shared_memory is implemented ;-)

> Some suggestions for documentation improvements (IMHO):
> 
> This page in the reference documentation
> 
> http://www.boost.org/doc/libs/1_37_0/doc/html/boost/interprocess/mapped_region.html
> 
> does not mention the copy_on_write mode; it would be very helpful if that mode
> were mentioned there.

Yes, copy_on_write should also appear here, because it's an lower-level 
but useful OS wrapper. Added to my to-do list.

> I also feel that it would be more natural if the section you quoted were moved
> to the "Sharing memory between processes" chapter because that mode is an
> inherent property of mapped files (generic OS mechanism), not of managed shared
> memory (particular framework implemented by your library). 

Ok, I'll see if it fits better there.

Regards,

Ion