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http://dev.sourcefabric.org/browse/LS-268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15539#action_15539
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David Baelde commented on LS-268:
---------------------------------
Hi Romain! Thanks a lot for pointing it out.
I remember our conclusions in the discussion about namespace (un)registration,
so my first reaction was: Yeeeepee, so many headaches go away, we didn't really
need to deal with re-awakening, checking that threads have exited, etc.
However I'm afraid the truth is that the old difficult code is justified and we
overlooked the issue the other day. (As a result we'll get a failed assertion
because we don't reset the namespace to [] after unregistering it.) Here's how
to re-awaken:
p = playlist(...)
x = output.dummy(...)
At this point, the output has started automatically, it's been woken up, and it
woke up p. Later on, execute this code:
source.shutdown(x)
Now x and p have been stopped and put to sleep, which is necessary to make
garbage collection possible. However, in that case we can re-enable them:
output.dummy(p)
The new output starts automatically and re-awakens p. We can also do
output.dummy(x), even though it feels weird. The really weird thing is that the
only way to startup an active source is implicit upon creation.
> Clean thread management for input.http() (and input.harbor())
> -------------------------------------------------------------
>
> Key: LS-268
> URL: http://dev.sourcefabric.org/browse/LS-268
> Project: Liquidsoap
> Issue Type: Bug
> Components: Liquidsoap
> Priority: Blocker
>
> Currently, when an input.http goes to #sleep, it asks its feeding thread to
> exit, but does not check that it exited. As a consequence, a #wake_up quickly
> after the #sleep could cause (1) the old thread to not exit and hence (2) two
> feeding threads at the same time.
> (Another slightly related issue is that the feeding thread might have
> non-trivial activity during the shutdown phase: it can be in the middle of a
> connection when shutdown starts, and we have to wait for it to start decoding
> before that it notices that it should exit.)
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