Can't find windows' CreateThread function / concurrency.spawn crashes host application

[alkololl via Digitalmars-d-learn]

On Friday, 1 January 2016 at 22:45:20 UTC, Adam D. Ruppe wrote:
> On Friday, 1 January 2016 at 22:02:46 UTC, alkololl wrote:
>> I've found that std.c.windows.windows doesn't include a
>
> std.c.windows is basically useless. The new version should have 
> it in core.sys.windows.windows though I'm not sure if it has 
> actually been released yet.
>
> If it isn't in there on your version, you can also just define 
> teh function yourself somewhere and use it. Add to your module:
>
> extern(Windows)
> HANDLE CreateThread(
>    LPSECURITY_ATTRIBUTES  lpThreadAttributes,
>    SIZE_T                 dwStackSize,
>    LPTHREAD_START_ROUTINE lpStartAddress,
>    LPVOID                 lpParameter,
>    DWORD                  dwCreationFlags,
>    LPDWORD                lpThreadId
> );
>
> and then call it. If a type isn't defined you can replace it 
> with void* usually.

Thanks, I replaced LPSECURITY_ATTRIBUTES and 
LPTHREAD_START_ROUTINE with void* and it works now. Anyhow the 
method FreeLibraryAndExitThread, which worked perfectly in the 
C++ Dll, doesn't unload the D Dll properly (the call has no 
effect at all). Why is that?