Re: Inter-process sync question?

From:

"Ben Voigt [C++ MVP]" <rbv@newsgroups.nospam>

Newsgroups:

microsoft.public.vc.language

Date:

Tue, 21 Jul 2009 18:47:59 -0500

Message-ID:

<107BA041-1F7F-48E5-A7B8-43997790BEB0@microsoft.com>

|Then yeah, I don't understand why you were trying to wait for an event at
|all. Wait "until the current DLL's initialization is complete" sounded
like
|you were doing other work. By the time DllMain runs, pretty much all the
OS
|initialization tasks are already done (except releasing the loader lock).

I was afraid Thread2 would be calling functions from DLLs other that
KERNEL32.DLL inappropriately early. I haven't yet tried it without any
synchronization. If it doesn't work, I'll be back. :-)

That's not a problem. If Thread2 needs functions from other DLLs, there are
two possibilities:

imports -- Windows loaded those DLLs before it called your DllMain, no
problem

dynamic loading -- You call LoadLibrary. Windows takes the loader lock so
it can update internal structures. This may require waiting for DllMain on
Thread1 to finish because it is holding the lock. Calling LoadLibrary from
Thread1 would be a disaster because the lock is not re-entrant, Windows
would wait forever trying to acquire it (again). But from Thread2 there is
no problem whatsoever.

--
- Vince