[Boost-users] [shared_ptr] make_shared causes Access Violation

Subject: [Boost-users] [shared_ptr] make_shared causes Access Violation
From: Paul Heil (paul.heil_at_[hidden])
Date: 2011-05-10 16:10:13

I have a Visual Studio 2008 C++ application for ARMV4I Windows Mobile 6
where I'm using `boost::shared_ptr<>` to manage a fairly large object (4KB).
Unfortunately, `boost::make_shared<>` causes an Access Violation exception.
I am using Boost 1.45.0 with STLPort 5.2.1.

My code:

    struct Foo
    {
        char a[ 4 * 1024 - 1 ];
    };

    int _tmain( int argc, _TCHAR* argv[] )
    {
        boost::shared_ptr< Foo > f = boost::make_shared< Foo >(); // Access
Violation
        return 0;
    }

The exception callstack:

    test.exe!boost::detail::sp_ms_deleter<o>::sp_ms_deleter<o>(void) Line:
60, Byte Offsets: 0x18    C++
    test.exe!boost::make_shared<o>(void) Line: 106, Byte Offsets: 0x5c
C++
    test.exe!wmain(int argc = 1, wchar_t** argv = 0x01b40060) Line: 81, Byte
Offsets: 0x18    C++
    test.exe!mainWCRTStartup(HINSTANCE__* hInstance = 0x00000003,
HINSTANCE__* hInstancePrev = 0x00000000, unsigned short* lpszCmdLine =
0x00000003, int nCmdShow = 0) Line: 188, Byte Offsets: 0x94    C++

The location of the exception (boost\smart_ptr\make_shared.hpp):

    template< class T > class sp_ms_deleter
    {
        /* snip! */
    public:
        sp_ms_deleter(): initialized_( false )
        {    // line: 60  this = NULL
        }

        /* snip! */

This issue does not occur when compiling for x86 Windows. This issue also
does not occur when using the shared_ptr like this:

    boost::shared_ptr< Foo > f1 = boost::shared_ptr< Foo >( new Foo );

Can anybody explain what's going on and why this is breaking only on ARMV4I
Windows Mobile 6?

Thanks,
PaulH