From: Sam Partington (sam.partington_at_[hidden])
Date: 2006-01-30 11:02:06
> You can avoid having to make the implementation thread safe by making the
> pointee thread safe.
> This can be done by using an intrusive lock.
How? The FAQ is talking about making the reference count thread safe,
not the object thread safe.
class A { };
void f(ptr<A> a) { }
int main()
{
ptr<A> a(new A);
boost::thread t(boost::bind(f, a));
}
Which thread does the deallocation of a? What protects both of them
from trying to deallocate it at the same time?
> I guess this could be considered not enough of an advantage if 22% to 30%
> extra efficiency is not that important.
> But some developers would differ.
Until there is a thread safe implemenation then any performance
comparisons are irrelevant because you're comparing apples and
oranges.
Sam