On 2012-10-19 03:06, Michel Fortin wrote:
All this is nice, but what is the owner thread for immutable data?
Because immutable is always implicitly shared, all your strings and
everything else that is immutable is thus "shared" and must be tracked
by the global heap's collector and can never be handled by a
thread-local collector. Even if most immutable data never leaves the
thread it was allocated in, there's no way you can know.
I don't think per-thread GCs will work very well without support for
immutable data, an for that you need to have a distinction between
immutable and shared immutable (just like you have with mutable data). I
complained about this almost three years ago when the semantics of
shared were being defined, but it got nowhere. Quoting Walter at the time:
Would it be any difference if the immutable data was collected from a
different collector than the shared or thread local?
In this case I guess the collector wouldn't try to make a difference
between shared and non-shared immutable data.
--
/Jacob Carlborg
