Memory mapping

[Jon Harrop]

Does .NET provide an equivalent of memory mapped files from Linux?

--
Dr Jon D Harrop, Flying Frog Consultancy
http://www.ffconsultancy.com/products/?u

[Jon Skeet [C# MVP]]

On May 30, 9:00 am, Jon Harrop <[e-mail]:

Does .NET provide an equivalent of memory mapped files from Linux?

Not as far as I'm aware. A quick search found this library, however:
http://www.winterdom.com/dev/dotnet/index.html

(Windows itself supports memory mapped files, so it's just a case of
wrapping the calls.)

I wouldn't be surprised to find this had crept into later versions
of .NET without me noticing, mind you.

Jon

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

Jon Harrop wrote:

Does .NET provide an equivalent of memory mapped files from Linux?

Win32 API does.

I once used it Delphi-C#.

Below is a snippet of declarations.

Arne

================================================== ==========

const int PAGE_READONLY = 0x0002;
const int PAGE_READWRITE = 0x0004;
const int PAGE_EXECUTE = 0x0010;
const int PAGE_EXECUTE_READ = 0x0020;
const int PAGE_EXECUTE_READWRITE = 0x0040;
const int PAGE_GUARD = 0x0100;
const int PAGE_NOACCESS = 0x0001;
const int PAGE_NOCACHE = 0x0200;
const int FILE_MAP_COPY = 0x0001;
const int FILE_MAP_WRITE = 0x0002;
const int FILE_MAP_READ = 0x0004;
const int FILE_MAP_ALL_ACCESS = 0x001F;

[StructLayout( LayoutKind.Sequential )]
class SECURITY_ATTRIBUTES
{
//int nLength;
//int lpSecurityDescriptor;
//int bInheritHandle;
}

[DllImport("kernel32.dll")]
static extern int CreateFileMappingA ( uint hFile,
SECURITY_ATTRIBUTES
lpFileMappigAttributes,
int flProtect,
int dwMaximumSizeHigh,
int dwMaximumSizeLow,
string lpName);

[DllImport("kernel32.dll")]
static extern IntPtr MapViewOfFile ( int hFileMappingObject,
int dwDesiredAccess,
int dwFileOffsetHigh,
int dwFileOffsetLow,
int dwNumberOfBytesToMap);

[DllImport("kernel32.dll")]
static extern int UnmapViewOfFile (IntPtr lpBaseAddress);

[DllImport("kernel32.dll")]
static extern int CloseHandle ( int hObject);