[Bug 31954] Second Sight hangs with a black screen after the intro videos

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=31954

--- Comment #39 from Chebanenko Igor <chebanenkoigor93 at gmail.com> ---
(In reply to Paul Gofman from comment #38)
> I've got some more details now after more testing, it looks like sync or
> async result for read and write differs between Windows versions and
> preconditions (likely by the data availability in cache). But when the file
> is created with FILE_FLAG_NO_BUFFERING (which I checked is actually the case
> for Second Sight demo), it looks like async return is consistent. I refined
> my patch this way and going to suggest it upstream with the test.
> 
> The patch "Alternative 1" from Bug 42982 looks incorrect to me in a sense
> that non-zero overlapped parameter in kernel32.ReadFile() does not imply
> async read. Really "overlapped" read is requested by FILE_FLAG_OVERLAPPED
> given to CreateFile(), otherwise this parameter can be just used to specify
> position for sync read. Regarding doing the read really asynchronous, I
> suppose it is completely distinct change which most likely would benefit
> from some heuristics when it is worth doing.



Looks like it will help:

https://support.microsoft.com/ru-ru/help/156932/asynchronous-disk-i-o-appears-as-synchronous-on-windows

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