Re: VS2008 destroys static objects before global (non-static) objects?

From:
"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>
Newsgroups:
microsoft.public.vc.language
Date:
Wed, 22 Oct 2008 08:58:50 -0500
Message-ID:
<eDAtQ5ENJHA.6044@TK2MSFTNGP02.phx.gbl>

My problem explained in pseudocode is this:

----------
template <typename T>
class memory_manager
{
  public:
    void *operator new(std::size_t) { return mem_p_.malloc(); }
    void operator delete(void *p) { p_.free(p); }

  private:
    static pool p_;
};

class small_object : public memory_manager<small_object>
{
};


Well, you're missing the definition of memory_manager<small_object>::p_

It has global lifetime (although private visibility). So you have some
difficulty controlling the construction and destruction order, yes.

std::auto_ptr<small_object> o(new small_object());
----------

While the class definitions are in one DLL o is defined in another DLL
(let's call them 1.dll and 2.dll where 1.dll depends on 2.dll). When
the DLLs are loaded p_ in 2.dll is initialized first followed by an
initialization of o and again p_ in 1.dll (at least that's what I see
when stepping through the DLL initialization code; maybe I'm wrong
here as I don't fully understand what Microsoft is doing there in
crtdll.c and crt0dat.c). When the DLLs are unloaded everything is
uninitialized but in reverse order. As the destructor of p_ is then
called first which frees all memory managed by the memory manager I
get an access violation when o is destroyed.

The code worked fine for years with VS2005 (and also g++ on Linux).
If the initialization and destruction order was really changed in
VS2008 I need to think about how to adapt the code. :-/

Boris

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