#5060: iteratee: epollControl: permission denied (Operation not permitted)
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Reporter: pacak | Owner: johan.tibell@…
Type: bug | Status: new
Priority: high | Milestone: 7.2.1
Component: libraries/base | Version: 7.0.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime
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Comment(by tibbe):
Note that there's currently no good way to do async file I/O. Not with the
old or new I/O manager. epoll makes this more clear by throwing the error
you're seeing, while select/poll will just silently accept the file
descriptor.
As for the iteratee library implementation, I recommend just making
blocking read/write calls. Given the way that GHC implements (safe)
foreign calls GHC should reuse OS threads from its thread pool to make the
calls.
The only thing we can fix at the moment is the documentation of
`Control.Concurrent.threadWait*`.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5060#comment:17>
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