Re: How to make this program more efficient?

James Kanze <>
Tue, 16 Sep 2008 01:56:27 -0700 (PDT)
On Sep 16, 6:22 am, Jerry Coffin <> wrote:

In article <f9c317c4-329c-4951-922d-0b1125a67ef9>, says...

[ ... ]

Another is to use something like reference counting so you
can determinstically dispose of the map as soon as it's no
longer in use. Depending on usage pattern, you can often
reduce the reference count to a single bit for each thread
(basically a mutex).

You'll have to explain that one to me. (I agree that this
is a pattern in which reference counting works extremely
well, but I'm pretty sure you still need more than a single
bit to implement it.)

As I said, it depends on the usage -- in a pretty fair number
of cases, a thread isn't capable of creating more than one
reference to the contents of the collection at any given time.
When that's the case, the maximum reference count is one...

But in that case, you don't need a reference count at all. Any
time you would decrement the reference count, you're guaranteed
that the result will be 0, and you'll have to delete, so you
might as well just delete immediately, without bothering with
the reference count.

James Kanze (GABI Software)
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