private Task GetTaskForValueTaskSource(IValueTaskSource t)
{
Task completedTask;
var status = t.GetStatus(Token);
if (status == ValueTaskSourceStatus.Pending)
{
return(new ValueTaskSourceAsTask(t, Token).Task);
}
try
{
t.GetResult(Token);
completedTask = CompletedTask;
}
catch (Exception exception1)
{
var exception = exception1;
if (status != ValueTaskSourceStatus.Canceled)
{
var taskCompletionSource = new TaskCompletionSource <bool>();
taskCompletionSource.TrySetException(exception);
completedTask = taskCompletionSource.Task;
}
else
{
completedTask = _task;
}
}
return(completedTask);
}
public ValueTask(IValueTaskSource source, Int16 token)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
_obj = source;
_token = token;
_continueOnCapturedContext = true;
}
public ValueTask(IValueTaskSource <TResult> source, short token)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
_obj = source;
_token = token;
_result = default;
_continueOnCapturedContext = true;
}
public async Task CreateAndAwait_FromCompletedValueTaskSource_ConfigureAwait()
{
IValueTaskSource <int> vts = ManualResetValueTaskSource.Completed(42);
foreach (BenchmarkIteration iteration in Benchmark.Iterations)
{
long iters = Benchmark.InnerIterationCount;
using (iteration.StartMeasurement())
{
for (long i = 0; i < iters; i++)
{
await new ValueTask <int>(vts, 0).ConfigureAwait(false);
}
}
}
}
/// <summary>Creates a <see cref="Task{TResult}"/> to represent the <see cref="IValueTaskSource{TResult}"/>.</summary>
/// <remarks>
/// The <see cref="IValueTaskSource{TResult}"/> is passed in rather than reading and casting <see cref="_obj"/>
/// so that the caller can pass in an object it's already validated.
/// </remarks>
private Task <TResult> GetTaskForValueTaskSource(IValueTaskSource <TResult> t)
{
ValueTaskSourceStatus status = t.GetStatus(_token);
if (status != ValueTaskSourceStatus.Pending)
{
try
{
// Get the result of the operation and return a task for it.
// If any exception occurred, propagate it
return(AsyncTaskMethodBuilder <TResult> .GetTaskForResult(t.GetResult(_token)));
// If status is Faulted or Canceled, GetResult should throw. But
// we can't guarantee every implementation will do the "right thing".
// If it doesn't throw, we just treat that as success and ignore
// the status.
}
catch (Exception exc)
{
if (status == ValueTaskSourceStatus.Canceled)
{
if (exc is OperationCanceledException oce)
{
var task = new Task <TResult>();
task.TrySetCanceled(oce.CancellationToken, oce);
return(task);
}
Task <TResult> canceledTask = s_canceledTask;
if (canceledTask == null)
{
// Benign race condition to initialize cached task, as identity doesn't matter.
s_canceledTask = Task.FromCanceled <TResult>(new CancellationToken(true));
}
return(canceledTask);
}
else
{
return(Task.FromException <TResult>(exc));
}
}
}
return(new ValueTaskSourceAsTask(t, _token));
}
/// <summary>Creates a <see cref="Task"/> to represent the <see cref="IValueTaskSource"/>.</summary>
/// <remarks>
/// The <see cref="IValueTaskSource"/> is passed in rather than reading and casting <see cref="_obj"/>
/// so that the caller can pass in an object it's already validated.
/// </remarks>
private Task GetTaskForValueTaskSource(IValueTaskSource t)
{
ValueTaskSourceStatus status = t.GetStatus(_token);
if (status != ValueTaskSourceStatus.Pending)
{
try
{
// Propagate any exceptions that may have occurred, then return
// an already successfully completed task.
t.GetResult(_token);
return(Task.CompletedTask);
// If status is Faulted or Canceled, GetResult should throw. But
// we can't guarantee every implementation will do the "right thing".
// If it doesn't throw, we just treat that as success and ignore
// the status.
}
catch (Exception exc)
{
if (status == ValueTaskSourceStatus.Canceled)
{
if (exc is OperationCanceledException oce)
{
var task = new Task();
task.TrySetCanceled(oce.CancellationToken, oce);
return(task);
}
// Benign race condition to initialize cached task, as identity doesn't matter.
return(s_canceledTask ??= Task.FromCanceled(new CancellationToken(canceled: true)));
}
else
{
return(Task.FromException(exc));
}
}
}
return(new ValueTaskSourceAsTask(t, _token));
}
private Task GetTaskForValueTaskSource(IValueTaskSource t)
{
ValueTaskSourceStatus status = t.GetStatus(_token);
if (status == ValueTaskSourceStatus.Pending)
{
return(new ValueTaskSourceAsTask(t, _token).Task);
}
try
{
t.GetResult(_token);
return(CompletedTask);
}
catch (Exception ex)
{
if (status == ValueTaskSourceStatus.Canceled)
{
return(s_canceledTask);
}
TaskCompletionSource <Boolean> completionSource = new TaskCompletionSource <Boolean>();
completionSource.TrySetException(ex);
return(completionSource.Task);
}
}
public ValueTaskSourceAsTask(IValueTaskSource <TResult> source, short token)
{
_source = source;
_token = token;
source.OnCompleted(s_completionAction, this, token, ValueTaskSourceOnCompletedFlags.None);
}
internal ValueTaskSourceAsTask(IValueTaskSource source, short token)
{
_token = token;
_source = source;
source.OnCompleted(s_completionAction, this, token, ValueTaskSourceOnCompletedFlags.None);
}
public ValueTaskSourceAsTask(IValueTaskSource source, Int16 token)
{
_token = token;
_source = source;
source.OnCompleted(s_completionAction, this, token, ValueTaskSourceOnCompletedFlags.None);
}
public ValueTask(IValueTaskSource source, short token)
{
Obj = source ?? throw new ArgumentNullException(nameof(source));
Token = token;
ContinueOnCapturedContext = true;
}
