[fpc-devel] Why FreeBSD sem_init() works different to Linux?

[Henry Vermaak]

On Thu, Feb 07, 2013 at 01:01:47PM +0100, Jonas Maebe wrote:
> 
> On 07 Feb 2013, at 12:52, Jonas Maebe wrote:
> 
> >It doesn't belong in our manuals. Anyone who wants to manually
> >create low level thread synchronisation primitives will have to
> >know a lot more about cpu architecture and memory consistency
> >models then we could ever describe in our documentation.
> 
> In case anyone is interested, some good documents on this topic are:
> * http://www.rdrop.com/users/paulmck/scalability/paper/ordering.2007.09.19a.pdf
> * http://www.kernel.org/doc/Documentation/memory-barriers.txt

Paul McKenney has written quite a lot about this, I find his "Memory
Barriers: a Hardware View for Software Hackers" very useful.

Henry