Re: Thread - problem (tss.cpp under MSVC++6)

From: bill_kempf (williamkempf_at_[hidden])
Date: 2002-02-18 13:53:10

--- In boost_at_y..., Beman Dawes <bdawes_at_a...> wrote:
> At 10:09 AM 2/18/2002, bill_kempf wrote:
> 
>  >--- In boost_at_y..., "ajp_m" <a.maclean_at_a...> wrote:
>  >> A colleague of mine found the problem (many thanks Mike!).
>  >>
>  >> I did not compile the thread library as a DLL (silly me!).
>  >> Consequently, PROCESS_ATTACH in threadmon.cpp was not allocating
>  >the
>  >> key!
>  >>
>  >> i/e. in this section of code:
>  >> BOOL APIENTRY DllMain(HANDLE module, DWORD reason, LPVOID)
>  >> {
>  >>     switch (reason)
>  >>     {
>  >>         case DLL_PROCESS_ATTACH:
>  >>             InitializeCriticalSection(&cs);
>  >>             key = TlsAlloc();
>  >>             break;
>  >> ...
>  >>
>  >> Of course this begs the question:
>  >> Is it possible to modify the code so that if it is not compiled 
as
>  >a
>  >> DLL the code will still function correctly?
>  >
>  >The actual build process compiles most of the library as a static
>  >link library, but the threadmon stuff has to be in a DLL,
>  >unfortunately.  This is a consequence of the Win32 MT design where
>  >DllMain() is the only mechanism that allows you to cleanup thread
>  >resources.
> 
> Can you put a specific check into the threadmod code to give an 
#error if 
> it isn't being compiled as a DLL?  Only to apply to appropriate 
compilers, 
> of course.  Would save a lot of grief, I'd expect.

I'm not sure if there is a way to do this.  If there is I'd love to 
hear about it.  In the mean time, I'm adding a build.html page to the 
documentation that will talk about how to build/use the libraries on 
the various platforms.  Hopefully that will help.

Bill Kempf