[Mono-bugs] [Bug 690944] New: TPL cannot use main UI thread TaskScheduler

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=690944

https://bugzilla.novell.com/show_bug.cgi?id=690944#c0


           Summary: TPL cannot use main UI thread TaskScheduler
    Classification: Mono
           Product: MonoTouch
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Class Libraries
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: fak at kruegersystems.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Created an attachment (id=427357)
 --> (http://bugzilla.novell.com/attachment.cgi?id=427357)
Project file demoing bug

Description of Problem:

In order to run some code off the UI thread, and some on, the TaskScheduler
"TaskScheduler.FromCurrentSynchronizationContext()" is used with a ContinueWith
of the background task.

However, either ContinueWith is broken or the UI TaskScheduler is broken
because such synchronized tasks end up executing on the background thread
instead of the main UI thread.

Steps to reproduce the problem:

            var t = Task.Factory.StartNew(() => {
                return 42;
            });

            t.ContinueWith((r) => {

                // DO UI WORK ON UI THREAD

            }, TaskScheduler.FromCurrentSynchronizationContext());


There is an attached project that demos this bug. Watch the console output.

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