On Wed, Apr 09, 2014 at 05:55:57AM +0000, WANG Cheng D wrote:
Dear Daniel, As you know, following your suggestion, I can expose shared memory to two containers hosted by the same machine, thus the two containers can exchange data. Now I have a new problem: how does the containers avoid concurrent accesses to the shared memory? In a native system, this can be achieved by using semaphore. But I don't know how the two containers can see the same semaphore. Do I need to design a mechanism to control the access to the shared memory?
Correct, there's no way to share semaphores. Since you hav shared memory though, can you use a POSIX process shared mutex that is allocated in that shared memory block. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|