join() timesout even though thread has completed

[Craig]

Hi,
I'd just like to know why, when a System.Threading.Timer timer is fired, and
I set a class variable to CurrentThread within the Timer method, that when
calling Join on that thread in a different thread, it times out even though
the Timer method has completed.
Do I need to explicitly create a new thread explicitly in the Timer method
being fired and join on that new thread instead? I would have imagined that
when the Timer goes off, a thread is created in the background and joining
on that thread would have worked.
Thanks.
Craig

 

[Nicholas Paldino [.NET/C# MVP]]

Craig,

I believe the timer class fires an event on a thread from the thread
pool, which is why you won't see the thread die (it is being kept alive in
the pool).

If you are looking for a signal for when a task is complete, you should
not use the join method on the thread. Rather, you should set up an event
and wait on that.

Hope this helps.