Windows: Throwing Exceptions from Fibers in D2.059: Access Violation

[Andrew Lauritzen]

> Gah, not this again. *sigh*
>
> It is semi-well tested as in that I'm relying on it for async 
> I/O in Thrift, and its test suite now passes on every Windows 
> box I tested.
>
> If you can spare the time, it would be great if you cloud 
> download DMD 2.057 and try if the test case also fails with it 
> on your setup. The reason is that I changed the way the top of 
> the SEH chain is set up for fibers in 2.058 to make it work on 
> Windows Server 2008/2008 R2, and maybe I inadvertently screwed 
> up the stack alignment/… (you have to reverse-engineer the 
> gritty details of SEH as you are going, and you never know 
> whether you really »got it right« in terms of Microsoft's 
> internal specs).

Yeah I feel your pain on Windows SEH stuff and lack of docs. I 
actually work with someone who used to work on Visual C++ so I'll 
see if I can get any info/links out of him on the subject that 
may be helpful :)

In the mean time, as per the issue in the discussion, the plot 
has thickened to include there being apparently side-effects to 
putting break-points/debugging the code itself, which throws a 
big wrench into my analysis of what is going wrong. Suffice it 
say, I'm not sure it's actually D's problem, although I'm still 
worried by the "Stack Overflow" message.

I'll grab 2.057 and give it a test though to see if the behavior 
is any different. Thanks!