static async void AddOne(WritableChannel <int> output, ReadableChannel <int> input)
{
await output.WriteAsync(1 + await input.ReadAsync());
}
public static Task <T> ReadAsync <T>(this ReadableChannel <T> channel)
{
return(channel.ReadAsync(CancellationToken.None, acceptanceTest => true));
}
private async Task ProcessCaseAsync <T>(ReadableChannel <T> channel, Func <T, Task> callback, Func <T, bool> additionalAcceptanceTest)
{
try {
while (!cts.IsCancellationRequested)
{
bool isFinalDispatch = false;
T item;
try {
item = await channel.ReadAsync(
cts.Token,
x => {
if (!additionalAcceptanceTest(x))
{
return(false);
}
if (Interlocked.CompareExchange(ref dispatchesRemaining, 0, 0) == kTimesInfinite)
{
return(true);
}
else
{
var spinner = new SpinWait();
while (true)
{
var capturedDispatchesRemaining = Interlocked.CompareExchange(ref dispatchesRemaining, 0, 0);
var nextDispatchesRemaining = capturedDispatchesRemaining - 1;
if (nextDispatchesRemaining < 0)
{
return(false);
}
if (Interlocked.CompareExchange(ref dispatchesRemaining, nextDispatchesRemaining, capturedDispatchesRemaining) == capturedDispatchesRemaining)
{
isFinalDispatch = nextDispatchesRemaining == 0;
return(true);
}
spinner.SpinOnce();
}
}
}).ConfigureAwait(false);
} catch (OperationCanceledException) {
//Exit processing loop - no dispatches remaining
break;
}
// Signal other case workers to exit
if (isFinalDispatch)
{
cts.Cancel();
}
// Execute callback
await callback(item).ConfigureAwait(false);
// Mark dispatcher as completed, signal awaiters
if (isFinalDispatch)
{
IsCompleted = true;
completionBox.SetResult(true);
}
}
} catch (Exception ex) {
// Signal all other case workers to exit
cts.Cancel();
// Bubble all exceptions up to dispatcher awaiters
IsCompleted = true;
completionBox.SetException(ex);
}
}
public static T Read <T>(this ReadableChannel <T> channel)
{
return(channel.ReadAsync().Result);
}
static async void AddOne(WritableChannel <int> output, ReadableChannel <int> input)
{
await output.WriteAsync(1 + await input.ReadAsync().ConfigureAwait(false));
}