Juha Nieminen <nospam@thanks.invalid>
Thu, 30 Jul 2009 08:16:48 GMT
Jerry Coffin wrote:

Not really. As long as you always do a deep copy (regardless of SSO),
you avoid sharing access to the string's internals. Any particular
string can only belong to one thread at any given time. Since there's
never any shared access to any particular data, you never have to
synchronize access to the data.

  I don't understand how there is never any synchronization problems
when deep-copying data from one thread to another. To me it seems fairly
obvious that *during* the copying you need to lock the data: If the
source thread modifies the data or the destination thread reads it while
it's being copied, the data will be corrupted (or in the case of the
reading thread the data will not be corrupted, but it will get the wrong
data because it will be reading data which has only been partially copied).

  If, for example, thread A is copying a string to thread B, it has to
say to thread B "don't read it yet, I'm not done" until the copying has

  If you are talking about a "create copies for all thread *before*
creating the threads" then that's different because the copying is not
done from one thread to another in the first place.

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