Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
Mono organizations on
GitHub to continue tracking issues. Bugzilla will remain
available for reference in read-only mode. We will continue to work
on open Bugzilla bugs, copy them to the new locations
as needed for follow-up, and add the new items under Related
Our sincere thanks to everyone who has contributed on this bug
tracker over the years. Thanks also for your understanding as we
make these adjustments and improvements for the future.
Please create a new report on
GitHub or Developer Community with
your current version information, steps to reproduce, and relevant error
messages or log files if you are hitting an issue that looks similar to
this resolved bug and you do not yet see a matching new report.
the following test fails consistently in Windows 7.
public void TaskWaitDoesNotRunTaskOnCurrentThread()
var mainThreadId = Thread.CurrentThread.ManagedThreadId;
var threadThreadId = mainThreadId;
Task task = Task.Factory.StartNew(() => threadThreadId = Thread.CurrentThread.ManagedThreadId);
task = Task.Factory.StartNew(() => threadThreadId = Thread.CurrentThread.ManagedThreadId);
This same test with .NET 4.0 does not fail.
This is implementation/OS detail. .NET Framework is free to choose any available thread to execute the task
Any *available* thread, it's running it on the *current* thread.
If you're trying to do background tasks *off* the UI thread, this is bad; because the code ends up running on the UI thread and completely bogs down the UI.
Fixed in master, the handling is now task scheduler specific.
Thanks for the bug report.