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From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-04-08 04:58:49

Christoph Ludwig wrote:

> I did not follow the discussions about lock free implementations for
> shared_ptr closely. But I saw that they make use of inline assembler
> whence there cannot be a lock free implementation that is portable
> across all platforms. I therefore gather that the previous
> implementation is still available as a fall-back for platforms
> without a lock-free implementation, isn't it?
> Can the old implementation be made available in 1.33 by means of a
> preprocessor switch?

On Windows, the old spinlock-based implementation is no longer available;
the new implementation is better in every respect.

On other platforms the old pthread_mutex implementation can be forced with

In both cases a single-threaded version can be forced with

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