Re: [Boost-users] [Interprocess] Different outputs under bash and gdb

Subject: Re: [Boost-users] [Interprocess] Different outputs under bash and gdb
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2010-11-24 10:19:48

On 24/11/2010 15:21, Aditya Gadre wrote:
> Ion,
>
> Thank you for your reply. According to Boost.Interprocess documentation,
> you *can* share std::vector by using managed shared memory and
> Boost.Interprocess allocator (please see "Creating vectors in shared
> memory" in "Quick guide for the impatient" in Boost.Interprocess
> documentation). Following those guidelines and the example therein , I
> have successfully shared std::vector object using following -

Believe me, you can't. The example uses boost::interprocess::vector (see 
using namespace boost::interprocess; and not using namespace std;)

http://www.boost.org/doc/libs/1_45_0/doc/html/interprocess/quick_guide.html#interprocess.quick_guide.qg_interprocess_container

you can't share a std::vector because its internal pointers are normally 
raw pointers. If two processes map the segment in a different base 
address it will crash. If you are lucky and both processes map the 
segment in the same address, then it won't crash, but you have no 
guarantee for that. For more explanations see:

http://www.boost.org/doc/libs/1_45_0/doc/html/interprocess/allocators_containers.html#interprocess.allocators_containers.containers_explained

Best,

Ion