protected override void Dispose(bool disposing)
{
if (!_disposed)
{
_disposed = true;
if (disposing)
{
// TODO (Issue 2508): Pinned buffers must be released in the callback, when it is guaranteed no further
// operations will be made to the send/receive buffers.
if (_cachedReceivePinnedBuffer.IsAllocated)
{
_cachedReceivePinnedBuffer.Free();
}
if (_state.RequestHandle != null)
{
_state.RequestHandle.Dispose();
_state.RequestHandle = null;
}
_state.Dispose();
}
}
base.Dispose(disposing);
}
private static void OnRequestHandleClosing(WinHttpRequestState state)
{
Debug.Assert(state != null, "OnRequestSendRequestComplete: state is null");
// This is the last notification callback that WinHTTP will send. Therefore, we can
// now explicitly dispose the state object which will free its corresponding GCHandle.
// This will then allow the state object to be garbage collected.
state.Dispose();
}
private RendezvousAwaitable<int> InternalSendRequestAsync(WinHttpRequestState state)
{
lock (state.Lock)
{
state.Pin();
if (!Interop.WinHttp.WinHttpSendRequest(
state.RequestHandle,
null,
0,
IntPtr.Zero,
0,
0,
state.ToIntPtr()))
{
// Dispose (which will unpin) the state object. Since this failed, WinHTTP won't associate
// our context value (state object) to the request handle. And thus we won't get HANDLE_CLOSING
// notifications which would normally cause the state object to be unpinned and disposed.
state.Dispose();
WinHttpException.ThrowExceptionUsingLastError();
}
}
return state.LifecycleAwaitable;
}
private Task<bool> InternalSendRequestAsync(WinHttpRequestState state)
{
state.TcsSendRequest = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
lock (state.Lock)
{
state.Pin();
if (!Interop.WinHttp.WinHttpSendRequest(
state.RequestHandle,
null,
0,
IntPtr.Zero,
0,
0,
state.ToIntPtr()))
{
// Dispose (which will unpin) the state object. Since this failed, WinHTTP won't associate
// our context value (state object) to the request handle. And thus we won't get HANDLE_CLOSING
// notifications which would normally cause the state object to be unpinned and disposed.
state.Dispose();
WinHttpException.ThrowExceptionUsingLastError();
}
}
return state.TcsSendRequest.Task;
}
private static void OnRequestHandleClosing(WinHttpRequestState state)
{
Debug.Assert(state != null, "OnRequestSendRequestComplete: state is null");
// This is the last notification callback that WinHTTP will send. Therefore, we can
// now explicitly dispose the state object which will free its corresponding GCHandle.
// This will then allow the state object to be garbage collected.
state.Dispose();
}
