Re: [Boost-users] [interprocess] access dynamically accessed shared region in another process

Am Mittwoch, 1. April 2009 18:58:39 schrieb Ion Gaztañaga:

Thanks for the quick reply, Dan. Yes, all pointers placed in shared memory should be offset_ptr as explained here:

http://www.boost.org/doc/libs/1_38_0/doc/html/interprocess/sharedmemorybetw eenprocesses.html#interprocess.sharedmemorybetweenprocesses.mapped_region_ob ject_limitations

Thanks for the quick reply! Meanwhile I suspected as much, but didn't know for sure how to interpret the docs. Also, this alignment check taken from the docs doesn't compile anymore with a pointer type as such: struct transfer_buffer { boost::interprocess::offset_ptr<void> buf; size_t bufsize; }; ... ret->bufsize = SIZE; ret->buf = seg->allocate_aligned(ret->bufsize, Alignment); // Check alignment assert((static_cast(ret->buf) - static_cast(0)) % Alignment == 0); The assert gives me: /home/sm/devel/rtssvn/cpp/librender/Render.cpp:109: Erro: invalid static_cast of type »boost::interprocess::offset_ptr<void>« into type »void*« Is that assert actually neccessary? I wouldn't know what to do in case of a failure anyway.... Performance accessing the buffer matters a lot though. Cheers, Stephan