internal QuerySettings WithPerExecutionSettings(CancellationTokenSource topLevelCancellationTokenSource, Shared <bool> topLevelDisposedFlag)
{
//Initialize a new QuerySettings structure and copy in the current settings.
//Note: this has the very important effect of newing a fresh CancellationSettings,
// and _not_ copying in the current internalCancellationSource or topLevelDisposedFlag which should not be
// propagated to internal query executions. (This affects SelectMany execution)
// The fresh toplevel parameters are used instead.
QuerySettings settings = new QuerySettings(TaskScheduler, DegreeOfParallelism, CancellationState.ExternalCancellationToken, ExecutionMode, MergeOptions);
Debug.Assert(topLevelCancellationTokenSource != null, "There should always be a top-level cancellation signal specified.");
settings.CancellationState.InternalCancellationTokenSource = topLevelCancellationTokenSource;
//Merge internal and external tokens to form the combined token
settings.CancellationState.MergedCancellationTokenSource =
CancellationTokenSource.CreateLinkedTokenSource(settings.CancellationState.InternalCancellationTokenSource.Token, settings.CancellationState.ExternalCancellationToken);
// and copy in the topLevelDisposedFlag
settings.CancellationState.TopLevelDisposedFlag = topLevelDisposedFlag;
Debug.Assert(settings.CancellationState.InternalCancellationTokenSource != null);
Debug.Assert(settings.CancellationState.MergedCancellationToken.CanBeCanceled);
Debug.Assert(settings.CancellationState.TopLevelDisposedFlag != null);
// Finally, assign a query Id to the settings
settings._queryId = PlinqEtwProvider.NextQueryId();
return(settings);
}
internal QuerySettings WithPerExecutionSettings(CancellationTokenSource topLevelCancellationTokenSource, System.Linq.Parallel.Shared <bool> topLevelDisposedFlag)
{
QuerySettings settings = new QuerySettings(this.TaskScheduler, this.DegreeOfParallelism, this.CancellationState.ExternalCancellationToken, this.ExecutionMode, this.MergeOptions);
settings.CancellationState.InternalCancellationTokenSource = topLevelCancellationTokenSource;
settings.CancellationState.MergedCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(settings.CancellationState.InternalCancellationTokenSource.Token, settings.CancellationState.ExternalCancellationToken);
settings.CancellationState.TopLevelDisposedFlag = topLevelDisposedFlag;
settings.m_queryId = PlinqEtwProvider.NextQueryId();
return(settings);
}
