private IEnumerator ExecuteYieldableTask(YieldableTask task)
{
object fiberResult = null;
// TODO: Cleanup
//
// This uses internal setters to fake starting the fiber
// and then uses internal Execute(). It should be possible to
// use public APIs instead to:
// 1. Set a fiber property to associate the task
// 2. Set an exception handler on the FiberScheduler
// 3. Retrieve the task in the handler from the fiber and set
// the exeption
// 4. Return from the handler without rethrowing
//
// This method could be removed then and the internal setters
// removed as well.
task.Fiber.Scheduler = scheduler;
task.Fiber.Status = FiberStatus.Running;
while(true)
{
try
{
// Throw here because the scheduler is disposed and will not
// run anything else. No further access is valid.
CancellationToken.ThrowIfCancellationRequested();
fiberResult = task.Fiber.Execute();
if(fiberResult is StopInstruction) {
// Check for exceptions
if (task.Fiber.IsFaulted) {
task.FiberException = task.Fiber.Exception;
}
yield break;
}
}
catch(System.Threading.OperationCanceledException ex)
{
// Fiber execution does not throw so the only exception
// expected is the cancellation above.
task.FiberException = ex;
yield break;
}
yield return fiberResult;
}
}
