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Diffstat (limited to 'libraries/base/GHC/Event/Control.hs')
| -rw-r--r-- | libraries/base/GHC/Event/Control.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libraries/base/GHC/Event/Control.hs b/libraries/base/GHC/Event/Control.hs index a9f23e07d2..9054da4f22 100644 --- a/libraries/base/GHC/Event/Control.hs +++ b/libraries/base/GHC/Event/Control.hs @@ -123,6 +123,10 @@ newControl shouldRegister = allocaArray 2 $ \fds -> do -- the RTS, then *BEFORE* the wakeup file is closed, we must call -- c_setIOManagerWakeupFd (-1), so that the RTS does not try to use the wakeup -- file after it has been closed. +-- +-- Note, however, that even if we do the above, this function is still racy +-- since we do not synchronize between here and ioManagerWakeup. +-- ioManagerWakeup ignores failures that arise from this case. closeControl :: Control -> IO () closeControl w = do _ <- atomicSwapIORef (controlIsDead w) True |