internal uint QueueBeginGetContext()
{
uint statusCode = UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS;
bool retry;
do
{
retry = false;
uint bytesTransferred = 0;
statusCode = HttpApi.HttpReceiveHttpRequest(
Server.RequestQueue.Handle,
_nativeRequestContext.RequestId,
// Small perf impact by not using HTTP_RECEIVE_REQUEST_FLAG_COPY_BODY
// if the request sends header+body in a single TCP packet
(uint)HttpApiTypes.HTTP_FLAGS.NONE,
_nativeRequestContext.NativeRequest,
_nativeRequestContext.Size,
&bytesTransferred,
_nativeRequestContext.NativeOverlapped);
if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_INVALID_PARAMETER && _nativeRequestContext.RequestId != 0)
{
// we might get this if somebody stole our RequestId,
// set RequestId to 0 and start all over again with the buffer we just allocated
// BUGBUG: how can someone steal our request ID? seems really bad and in need of fix.
_nativeRequestContext.RequestId = 0;
retry = true;
}
else if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA)
{
// the buffer was not big enough to fit the headers, we need
// to read the RequestId returned, allocate a new buffer of the required size
// (uint)backingBuffer.Length - AlignmentPadding
AllocateNativeRequest(bytesTransferred);
retry = true;
}
else if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS &&
HttpSysListener.SkipIOCPCallbackOnSuccess)
{
// IO operation completed synchronously - callback won't be called to signal completion.
IOCompleted(this, statusCode, bytesTransferred);
}
}while (retry);
return(statusCode);
}
