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

[Manu]

On 18 April 2012 21:48, Andrew Lauritzen <andrew.lauritzen at gmail.com> wrote:

> I sent this to the mailing list but as it appears to be awaiting
> moderation, here might be a more appropriate place for discussion.
>
> Throwing exceptions from fibers seems buggy on Windows in the latest D2
> runtime. Even a small modification to the example given in the unit test
> (adding unrelated exception handling to the same scope) fails with a "Stack
> Overflow" exception then tons of access violations:
>
>   enum MSG = "Test message.";
>   string caughtMsg;
>   (new Fiber({
>       try
>       {
>           throw new Exception(MSG);
>       }
>       catch (Exception e)
>       {
>           caughtMsg = e.msg;
>       }
>   })).call();
>   assert(caughtMsg == MSG);
>   // Add these two lines
>   try { caughtMsg = "Hello"; }
>   catch (Exception e) { caughtMsg = "World"; }
>
> It seems brittle as well. Adding a "assert(caughtMsg == "Hello");" to the
> end of the above program for instance avoids the access violations (but
> still shows the stack overflow in the debugger). Similarly playing with the
> caughtMsg assignments (omitting one) or adding another assert at the end of
> the program will sometimes cause the program to run without error. This is
> in debug mode with optimizations off to theoretically avoid dead code
> elimination, but clearly something is easily thrown off.
>
> I take it that not too many people are using Fibers on windows, but I
> really need them for a project that I'm working on. Alternatively I've
> considered trying to wrap native Win32 API Fibers to accomplish something
> similar, but I'm not sure of the difficulty of that. Anyone done this or
> have recommendations of a similar workaround? I really do need both
> fibers/coroutines and exceptions to express what I'm trying to do in a
> clean and efficient manner. I've considered switching to Go, but I've got
> some really handy mixins in D that would become copy-pasted stuff in Go
> presumably.
>
> I'm running a 32-bit D application on Windows 7 x64. I've tried on several
> machines with the same results, and the same issue was present in 2.058 as
> well.
>
> Any ideas?
>

How far did you get using Fibers on Windows in the end?
I'm using GDC for x64 Windows, and it crashes in call(), but before it
enters the fibre function. I think it's just broken... :/
Anyone else had problems?
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