Mere moments ago, quoth I:

On 19/05/2015 15:26, Lane wrote:

I'm using the boost meta state machine and upon entry of this state, I
create two threads, and stop these threads in the on_exit().

In on_entry(), I call the functors of each class and create threads and
add those to a boost thread_group. What I need to do now is call the
destructor of the objects on the threads ( of ClassA and ClassB) within
on_exit(). I'm unclear as to how the destructors of the objects
would/should be called when interrupting the threads. The destructors
are currently not being called.

Since you are passing a copy of the object as the thread's state, the
destructor for the local instances will be called in on_entry(), and the
destructor for the instances owned by the thread will be called when the
thread_group is destroyed, which is when MyEvent is destroyed.

I'm not really familiar enough with Boost.MSM to know whether the event
instance is destroyed when the event is handled (which if this were the
case, you shouldn't be keeping threads in it), or when the containing
state machine is destroyed, or only when the program exits.

Sorry, pressed Send too quickly.

If you want to destroy the threads in on_exit instead, then since thread_group lacks a means to remove a thread (unless you still have a reference to it), you will have to destroy the thread_group instead.

The simplest way to do that is to wrap it in a std::unique_ptr and reset() it in on_exit.

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