November 18, 2012
On Nov 18, 2012, at 12:44 PM, Jonathan M Davis <jmdavisProg@gmx.com> wrote:
> 
> So, I concur in that I don't see how the semantics of shared could possibly not be appropriate for mutexes. I started this thread primarily because I was shocked that Mutex, Condition, etc. weren't marked with shared already, and I didn't see how they could even be used without it (and apparently, the answer to that is that almost everyone cops out and uses __gshared).

I tried this once and it cascaded to requiring modifications of various definitions on core.sys.posix to add a "shared" qualifier, and since I wasn't ready to do that I rolled back the changes.  I guess the alternative would be to have a shared equivalent for every operation that basically just casts away shared and then calls the non-shared function, but that's such a terrible design I've been resisting it.
November 20, 2012
On Sunday, November 18, 2012 14:48:02 Sean Kelly wrote:
> On Nov 18, 2012, at 12:44 PM, Jonathan M Davis <jmdavisProg@gmx.com> wrote:
> > So, I concur in that I don't see how the semantics of shared could
> > possibly
> > not be appropriate for mutexes. I started this thread primarily because I
> > was shocked that Mutex, Condition, etc. weren't marked with shared
> > already, and I didn't see how they could even be used without it (and
> > apparently, the answer to that is that almost everyone cops out and uses
> > __gshared).
> 
> I tried this once and it cascaded to requiring modifications of various definitions on core.sys.posix to add a "shared" qualifier, and since I wasn't ready to do that I rolled back the changes.  I guess the alternative would be to have a shared equivalent for every operation that basically just casts away shared and then calls the non-shared function, but that's such a terrible design I've been resisting it.

Well, this is certainly going to need to be sorted out. And given that it's not unreasonable that both shared and __gshared be used with the type is core.sync, I don't think we have much choice to duplicate most of those functions (probably using casting internally to avoid actually duplicating the implementation in most cases) unless __gshared becomes implicitly convertible to shared.

- Jonathan M Davis
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