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/****************************************************************************
* Copyright (C) 2009-2015 EPAM Systems
*
* This file is part of Indigo toolkit.
*
* This file may be distributed and/or modified under the terms of the
* GNU General Public License version 3 as published by the Free Software
* Foundation and appearing in the file LICENSE.GPL included in the
* packaging of this file.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
***************************************************************************/
#if defined(_WIN32)
#include <windows.h>
#include <string.h>
#include "base_cpp/shmem.h"
using namespace indigo;
IMPL_ERROR(SharedMemory, "shared memory");
SharedMemory::SharedMemory (const char *name, int size, bool no_map_if_first)
{
char *winapi_error;
_map_object = NULL;
_pointer = NULL;
_map_object = CreateFileMapping(
INVALID_HANDLE_VALUE, // use paging file
NULL, // default security attributes
PAGE_READWRITE, // read/write access
0, // size: high 32-bits
size, // size: low 32-bits
name); // name of map object
if (_map_object == NULL)
{
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &winapi_error,
0, NULL );
throw Error("can't create map object: %s", winapi_error);
}
_was_first = (GetLastError() != ERROR_ALREADY_EXISTS);
if (_was_first && no_map_if_first)
return;
_pointer = MapViewOfFile(
_map_object, // object to map view of
FILE_MAP_WRITE, // read/write access
0, // high offset: map from
0, // low offset: beginning
0); // default: map entire file
if (_pointer == NULL)
{
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &winapi_error,
0, NULL );
throw Error("can't get pointer: %s", winapi_error);
}
strncpy(_id, name, sizeof(_id));
if (_was_first)
memset(_pointer, 0, size);
}
SharedMemory::~SharedMemory ()
{
if (_pointer != NULL)
UnmapViewOfFile(_pointer);
if (_map_object != NULL)
CloseHandle(_map_object);
}
#endif
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