public void Open(string name, SyncObjectTypes syncObjects)
{
if (_isDisposed)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
_name = name;
// Open file mapping.
_hSharedMemory = WinApi.OpenFileMapping(SectionAccessFlags.SECTION_ALL_ACCESS, false, _name);
if (_hSharedMemory == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error(),
"Error opening file mapping.");
}
// Get base address of file mapping.
_pSharedMemory = WinApi.MapViewOfFile(_hSharedMemory, SectionAccessFlags.SECTION_ALL_ACCESS,
0, 0, IntPtr.Zero);
if (_pSharedMemory == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error(),
"Error getting bsae address of file mapping.");
}
// Create synchronisation objects.
if (syncObjects != SyncObjectTypes.SyncObjNone)
{
CreateSyncObjects(syncObjects, name);
}
this.IsAvailable = true;
}
private bool _isDisposed = false; // True if object has been disposed.
public SharedMemory(string name, int size, SyncObjectTypes syncObjects, bool create)
{
if (create)
{
Create(name, size, syncObjects);
}
else
{
Open(name, syncObjects);
}
}
private void CreateSyncObjects(SyncObjectTypes syncObjects, string name)
{
// Create synchronisation objects.
if (syncObjects >= SyncObjectTypes.SyncObjRequest)
{
_sharedMutex = new Mutex(false, name + "_mutex");
_sharedReqEvent = new EventWaitHandle(false, EventResetMode.AutoReset,
name + "_req_event");
}
if (syncObjects >= SyncObjectTypes.SyncObjBoth)
{
_sharedRespEvent = new EventWaitHandle(false, EventResetMode.AutoReset,
name + "_resp_event");
}
}
public void Create(string name, int size, SyncObjectTypes syncObjects)
{
if (_isDisposed)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
_name = name;
_size = size;
// Create file mapping.
_hSharedMemory = WinApi.CreateFileMapping((IntPtr)WinApi.INVALID_HANDLE_VALUE, IntPtr.Zero,
PageProtection.ReadWrite, 0, _size * Marshal.SizeOf(typeof(T)), name);
if (_hSharedMemory == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error(),
"Error creating file mapping.");
}
// Get base address of file mapping.
_pSharedMemory = WinApi.MapViewOfFile(_hSharedMemory, SectionAccessFlags.SECTION_ALL_ACCESS,
0, 0, IntPtr.Zero);
if (_pSharedMemory == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error(),
"Error getting bsae address of file mapping.");
}
// Initialize file-mapped memory to zero.
WinApi.ZeroMemory(_pSharedMemory, _size * Marshal.SizeOf(typeof(T)));
// Create synchronisation objects.
if (syncObjects != SyncObjectTypes.SyncObjNone)
{
CreateSyncObjects(syncObjects, name);
}
this.IsAvailable = true;
}
