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

From: Beman Dawes (bdawes_at_[hidden])
Date: 2002-02-18 11:09:53

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.

--Beman