> I had thought of having the signal handler reap as many
> terminated child
> processes as possible, but had been concerned about a possible race
> condition. After you suggested that approach, I thought some more and
> decided that no race problem should exist. So I've
> implemented multiple
> reaping and it does help. I no longer have any tests hang as before.
> (Note that I still do see the occasional "EVACUATED object entered!"
> error.) However, the implementation turned out to be
> surprisingly complex.
Can you manage to get a repeatable case of the 'EVACUATED object' error?
I'd really like to track that one down.
> The first issue I confronted is that the get*ProcessStatus
> routines return
> an error rather than "nothing" if there is no candidate child process.
> (The GHC routines simply reflect the system call semantics.)
So can't you just catch the error? Something like
handler = do
r <- try (getAnyProcessStatus ...)
case r of
Left _ -> return ()
Right _ -> handler
Cheers,
Simon
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