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/****************************************************************************
* Copyright (C) from 2009 to Present EPAM Systems.
*
* This file is part of Indigo toolkit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
***************************************************************************/
#if defined(_WIN32)
#include <string.h>
#include <windows.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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