/// <summary>
/// Get the result of the work item.
/// If the work item didn't run yet then the caller waits for the result, timeout, or cancel.
/// In case of error the e argument is filled with the exception
/// </summary>
/// <returns>The result of the work item</returns>
private object GetResult(
int millisecondsTimeout,
bool exitContext,
WaitHandle cancelWaitHandle,
out Exception e)
{
e = null;
// Check for cancel
if (WorkItemState.Canceled == GetWorkItemState())
{
throw new WorkItemCancelException("Work item canceled");
}
// Check for completion
if (IsCompleted)
{
e = _exception;
return(_result);
}
// If no cancelWaitHandle is provided
if (null == cancelWaitHandle)
{
WaitHandle wh = GetWaitHandle();
bool timeout = !STPEventWaitHandle.WaitOne(wh, millisecondsTimeout, exitContext);
ReleaseWaitHandle();
if (timeout)
{
throw new WorkItemTimeoutException("Work item timeout");
}
}
else
{
WaitHandle wh = GetWaitHandle();
int result = STPEventWaitHandle.WaitAny(new WaitHandle[] { wh, cancelWaitHandle });
ReleaseWaitHandle();
switch (result)
{
case 0:
// The work item signaled
// Note that the signal could be also as a result of canceling the
// work item (not the get result)
break;
case 1:
case STPEventWaitHandle.WaitTimeout:
throw new WorkItemTimeoutException("Work item timeout");
default:
Debug.Assert(false);
break;
}
}
// Check for cancel
if (WorkItemState.Canceled == GetWorkItemState())
{
throw new WorkItemCancelException("Work item canceled");
}
Debug.Assert(IsCompleted);
e = _exception;
// Return the result
return(_result);
}
/// <summary>
/// Wait for the thread pool to be idle
/// </summary>
public override bool WaitForIdle(int millisecondsTimeout)
{
SmartThreadPool.ValidateWorkItemsGroupWaitForIdle(this);
return(STPEventWaitHandle.WaitOne(_isIdleWaitHandle, millisecondsTimeout, false));
}