/// <summary>
/// Process the non-dispose. Used when <see cref="nonDisposable"/> is true (singleton instances).
///
/// This may be called from <see cref="Dispose"/> or from the dispose of the last
/// belate handle (After <see cref="Dispose"/> has been called aswell).
///
/// Only one thread may process the dispose. Returns state back to 0.
///
/// Unattaches all disposables, disposes them, and calls <see cref="InnerDispose(ref StructList4{Exception})"/>.
/// Does not set state
/// </summary>
/// <exception cref="AggregateException">thrown if disposing threw errors</exception>
protected virtual void ProcessNonDispose()
{
// Revert state
Interlocked.CompareExchange(ref disposing, 0L, 1L);
// Extract snapshot, clear array
StructList2 <IDisposable> toDispose = default;
lock (m_disposelist_lock) { toDispose = disposeList; disposeList = default; }
// Captured errors
StructList4 <Exception> disposeErrors = new StructList4 <Exception>();
// Dispose disposables
DisposeList.DisposeAndCapture(ref toDispose, ref disposeErrors);
// Call InnerDispose(). Capture errors to compose it with others.
try
{
InnerDispose(ref disposeErrors);
}
catch (Exception e)
{
// Capture error
disposeErrors.Add(e);
}
// Throw captured errors
if (disposeErrors.Count > 0)
{
throw new AggregateException(disposeErrors);
}
}
/// <summary>
/// Add <paramref name="disposableObjects"/> to be disposed with the object.
/// </summary>
/// <param name="disposableObjects"></param>
/// <returns></returns>
bool IDisposeList.AddDisposables(IEnumerable disposableObjects)
{
// Argument error
if (disposableObjects == null)
{
throw new ArgumentNullException(nameof(disposableObjects));
}
// Parent is disposed/ing
if (IsDisposing)
{
// Captured errors
StructList4 <Exception> disposeErrors = new StructList4 <Exception>();
// Dispose now
DisposeList.DisposeAndCapture(disposableObjects, ref disposeErrors);
// Throw captured errors
if (disposeErrors.Count > 0)
{
throw new AggregateException(disposeErrors);
}
return(false);
}
// Add to list
lock (m_disposelist_lock)
foreach (Object d in disposableObjects)
{
if (d is IDisposable disposable)
{
disposeList.Add(disposable);
}
}
// Check parent again
if (IsDisposing)
{
// Captured errors
StructList4 <Exception> disposeErrors = new StructList4 <Exception>();
// Dispose now
DisposeList.DisposeAndCapture(disposableObjects, ref disposeErrors);
// Remove
lock (m_disposelist_lock) foreach (object d in disposableObjects)
{
if (d is IDisposable disp)
{
disposeList.Remove(disp);
}
}
// Throw captured errors
if (disposeErrors.Count > 0)
{
throw new AggregateException(disposeErrors);
}
return(false);
}
// OK
return(true);
}
/// <summary>
/// Process the actual dispose. This may be called from <see cref="Dispose"/> or from the dispose of the last
/// belate handle (After <see cref="Dispose"/> has been called aswell).
///
/// Only one thread may process the dispose.
/// Sets state to 2, and then 3.
///
/// Unattaches all disposables, disposes them, and calls <see cref="InnerDispose(ref StructList4{Exception})"/>.
/// </summary>
/// <exception cref="AggregateException">thrown if disposing threw errors</exception>
protected virtual void ProcessDispose()
{
// Set state IsDisposing=2, but let only one thread continue.
bool thisThreadChangedStateToIsDispose = (Interlocked.CompareExchange(ref disposing, 2L, 0L) == 0L) || (Interlocked.CompareExchange(ref disposing, 2L, 1L) == 1L);
// Not for this thread.
if (!thisThreadChangedStateToIsDispose)
{
return;
}
// Extract snapshot, clear array
StructList2 <IDisposable> toDispose = default;
lock (m_disposelist_lock) { toDispose = disposeList; disposeList = default; }
// Captured errors
StructList4 <Exception> disposeErrors = new StructList4 <Exception>();
// Dispose disposables
DisposeList.DisposeAndCapture(ref toDispose, ref disposeErrors);
// Call InnerDispose(). Capture errors to compose it with others.
try
{
InnerDispose(ref disposeErrors);
}
catch (Exception e)
{
// Capture error
disposeErrors.Add(e);
}
// Is disposed
Interlocked.CompareExchange(ref disposing, 3L, 2L);
// Throw captured errors
if (disposeErrors.Count > 0)
{
throw new AggregateException(disposeErrors);
}
}
public void Dispose()
{
// Only one thread can dispose
DisposeList _parent = Interlocked.CompareExchange(ref parent, null, parent);
// Handle has already been disposed
if (_parent == null)
{
return;
}
// Should dispose be started
bool processDispose = false;
// Decrement handle count
lock (_parent.m_disposelist_lock)
{
int newCount = --_parent.belateHandleCount;
// Is not the handle.
if (newCount > 0)
{
return;
}
// Check Dispose() has been called when counter goes to 0
processDispose = _parent.IsDisposeCalled;
}
// Start dispose
if (processDispose)
{
if (_parent.nonDisposable)
{
_parent.ProcessNonDispose();
}
else
{
_parent.ProcessDispose();
}
}
}
public BelateHandle(DisposeList parent)
{
this.parent = parent;
}
