[Boost-users] [statechart] Question about do activities

Subject: [Boost-users] [statechart] Question about do activities
From: Bill Clark (bill_at_[hidden])
Date: 2009-04-21 17:45:03

In the boost::statechart documentation, on the UML mapping page, it says
this about do activities: “A do activity can be simulated with a separate
thread that is started in the entry action and cancelled (!) in the exit
action of a particular state.”

What's the significance of the exclamation point here? Is it suggesting that
the thread should be killed rather than joined? I'm considering
boost::statechart for a design where do activities will be a fundamental
feature, so I'm wondering whether we might run into problems with this.