Boriss Mejias wrote:
Raphael Collet wrote:
Dear Ashis,
The port only keeps a reference to the unbound tail of the stream.
It does not keep alive all former messages that were sent.
Sorry for joining late, but, if you have a pointer to the beginning of
the stream, then all the messages sent to that port will stay in the
stream and not be garbage collected. is that right? for instance:
declare
S P
P = {NewPort S}
thread
for Msg in S do
{Browse Msg}
end
end
That will keep the whole stream of messages because you can always
access S.
An alternative code would be
declare
P
thread
S
in
P = {NewPort S}
for Msg in S do
{Browse Msg}
end
end
on this second code you don't need to keep the whole stream, and then
the garbage collector should be able to do its job.
cheers
Boriss
This is completely right. In the first example, S is part of the global
(interactive)
environment and is always accessible -> its data is never collected. In
the second
example, S is local and the 'for' loop traverses it -> all the data in
the stream
eventually becomes inaccessible and is collected. The identifier P
refers to the
port name and to the *current end* of the stream, so it can be global
without
hurting the memory management.
Peter
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