Jan-Willem Maessen wrote:
On Nov 1, 2008, at 9:38 AM, Andrew Coppin wrote:
Alberto G. Corona wrote:
Is there a way to know the number of memory references for a
variable?. The runtime must know it but i do not know if this
available for the program trough any low level trick
More precisely, the GC computes it each time it runs. (And only
computes it precisely during a "major" pass, not the more frequent
"minor" passes.)
Even this isn't quite true for most GC algorithms. The GC only needs
to compute whether there is 0 or >= 1 reference to a given location.
If you can see it, the answer is always >=1, so this information is
much less useful than you might think!
Quite right.
Usually the clever thing you want to know is "this is the sole
reference to the pointed-to object".
Does GHC have weak references? (I seem to recall it does...)
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