On Thu, 12 Nov 2009 15:01:24 -0500, Joel C. Salomon
<[email protected]> wrote:
On 11/11/2009 8:47 PM, dsimcha wrote:
== Quote from Walter Bright ([email protected])'s article
hasenj wrote:
Do you think D would benefit if you add this (or similar) feature to
it?
Sean is working on a message passing (CSP) package for D. I'm not
convinced it needs to be a core language feature, though.
This is true. After I created ParallelFuture (the lib w/ parallel
foreach, map,
reduce), a friend mentioned that my model was pretty similar to the
OpenMP model.
I read a little about OpenMP and it really hit home how powerful a
language D is,
given that I was able to implement something OpenMP-ish as a pure
library, without
any modifications to the compiler. The fact that message passing is
built into
Go! makes me wonder if there's a reason why it can't be done well in a
library.
Most stuff can be done decently well in a library -- imagine Plan 9’s
libthread with channels implemented input/output ranges. Select is ugly
though, without some language support; perhaps D’s compile-time stuff
can implement a select block.
—Joel Salomon
Ugly? I'm pretty sure you could do the following in D:
select(
guard(chan1, x = chan1.value;),
guard(chan2, y = chan2.value;),
guard(true , writeln("always triggers") )
);
Aren't lazy variables grand :)
