Re: [Boost-users] [interprocess] 32 to 64 bit ?

Subject: Re: [Boost-users] [interprocess] 32 to 64 bit ?
From: Allen Cronce (allenslists_at_[hidden])
Date: 2009-04-20 10:53:47

I was very excited about using the interprocess library to solve a set  
of problems in our current project, until I saw this post. We have to  
support 32 and 64 bit binaries. Falling back to using the low level  
utilities like mapped_region means that much of the appealing  
functionality from the interprocess library is unavailable to us.

I understand that certain functionally between different sized address  
spaces doesn't make sense. A very large shared space from a 64 bit  
process would not be addressable in 32 bits. But I doubt that people  
are really using this library to share address spaces larger than 4  
gig. More than likely developers want to share comparatively small  
amounts of data between processes.

Is there any plan to add support for 32/64 bit in the future?

Best,
--
Allen Cronce
On Apr 9, 2009, at 1:04 PM, Ion Gaztañaga wrote:
> Stephan Menzel wrote:
>> The code is the same as in my 32 - 32 bit versions and known to work.
>> Now I'm wondering, is this supposed to work or is 32 to 64 bit  
>> transfer
>> not supported at all? Is this a bug or a feature? Do I have to have  
>> both
>> applications in a 64 bit version?
>
> There is no support for 32bit-64bit communications. You would need  
> to use much lower level utilities, like mapped_regions to do that.
>
> Internal structures have platform-dependent sizes (e.g.: offset_ptr  
> needs to be bigger in 64 bit systems because it has to address much  
> bigger address space).
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