[c++-pthreads] Re: thread-safety definition

[Ted Baker]

> I think it will.  Even if cancellation is disabled while exceptions are 
> in flight, a 'catch-everything-and-never-rethrow' block in a destructor 
> will discard a cancellation exception when that destructor is triggered 
> by a regular (non-exceptional, non-unwinding) exit from a block scope.

That is why you need to disable cancellation during the execution
of destructors (and C cancellation cleanup handlers).

> Call me paranoid, but as a C++ programmer, the thing that scares me most 
>  in the discussions on this list is a certain (perceived?) pressure to 
> open the door for letting exceptions escape from destructors.  Speaking 
> for myself, all I can say is that such a license would break nearly 
> every piece of non-trivial code I've written over the last eight years 
> or so.

There is no need to let exceptions escape from destructors if you
disable cancellation during desctructor execution.

> - Wil

--Ted