Re: [Boost-Users] Macintosh Carbon Thread Error with Boost 1.30.0

From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-04-14 11:24:20

Bobby Thomale wrote:
>
> That helps tremendously.
>
> I do have a couple questions though.
>
> 1.  How non-thread-safe is the non-thread-safe implementation?  As
> long as a shared_ptr is only used in one thread am I ok?  Or is there
> issues even there if I am creating shared ptrs in more than one
> thread?  (Like are they sharing some kind of custom allocator?)
>
> Just curious what guaruntees there are there (if any) without the
> mutex.

If you don't pass a shared_ptr across threads you should be fine without the
mutex. By default, shared_ptr doesn't use a custom allocator.

> 2.  I may consider writing an implementation for Mac.  As far as I
> know there is not any sort of mutex in the MP library that is faster
> and lighter weight than the MP critical section stuff which I am sure
> boost::mutex uses
> - but it would be extrordinarily helpful for me if there was a
> header-only mutex implementation for the shared_ptr to use on Mac so
> I don't have to link Boost threads into all of my projects.
>
> I have a central library that uses shared_ptr heavily, and it also
> contains some thread code.  A lot of projects share that library, but
> I only link the thread stuff in if I actually use the
> thread-dependent parts of the library.
>
> If I were to write one who would I give it to to consider for
> inclusion?

Just post it here, or to the developer's list.