Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets)

On Wed, 10 May 2006, David Xu wrote:
> One of the problems to implement it is that atomic operations,
> if there are multiple integer needs to be updated by kernel,
> userland maybe gets an inconsistent result, the way to avoid the
> problem is using two generation numbers.
>
> http://gsu.linux.org.tr/~mpekmezci/kernelapi/unitedlinux/arch/x86_64/kernel/vsyscall.c.html
> check do_vgettimeofday(struct timeval * tv):
>
> Another problem is how you tell userland the address of the kernel
> page ? do you use fixed address or tell it via program headers like
> the PT_TLS set by kernel, check /usr/src/lib/libc/gen/tls.c.

Can you not make a simple pseudo device driver and mmap the page?

-- 
DE