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

From: Carl Daniel (cpdaniel_at_[hidden])
Date: 2002-02-18 14:01:53

From: "bill_kempf" <williamkempf_at_[hidden]>
> --- In boost_at_y..., Beman Dawes <bdawes_at_a...> wrote:
> > At 10:09 AM 2/18/2002, bill_kempf wrote:

> > 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.
>

I'm certain there's no way to detect it in the compiler, since DLLs are a linker concept of which the compiler is mostly
ignorant.  It would be possible to add code to detect at /runtime/ that the thread library code was statically linked
into an EXE - perhaps in the constructor of a static object so the check happens early.

The code would be something like this:

HMODULE hExe = GetModuleHandle(0);
MEMORY_BASIC_INFORMATION mbi;
static int dummy;
VirtualQuery( &dummy, &mbi, sizeof(mbi) );
HMODULE hMod = (HMODULE)mbi.AllocationBase;

if (hMod == hExe)
{
    // we were statically linked
}

Of course, this wouldn't detect the library being statically linked into a DLL along with other stuff, but would that
matter?  (being not that familiar with Boost.Threads, I just don't know).

-cd