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| author | Ben Gamari <ben@smart-cactus.org> | 2015-10-23 17:09:31 +0200 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2015-10-23 17:43:49 +0200 |
| commit | fd63ea5686fe5b856c3ebdc5f28bf7a2547bd96f (patch) | |
| tree | 60dde5bb92e617a62c7c9ad3a4aeb8422f757e74 /libraries | |
| parent | 0afba67f703ab0ba8cd041167144169d67e14501 (diff) | |
| download | haskell-fd63ea5686fe5b856c3ebdc5f28bf7a2547bd96f.tar.gz | |
base: Note platform dependence of registerFd
Just a documentation change. Fixes #10736.
Diffstat (limited to 'libraries')
| -rw-r--r-- | libraries/base/GHC/Event/Manager.hs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libraries/base/GHC/Event/Manager.hs b/libraries/base/GHC/Event/Manager.hs index b674866ad8..a94f8e8247 100644 --- a/libraries/base/GHC/Event/Manager.hs +++ b/libraries/base/GHC/Event/Manager.hs @@ -305,6 +305,11 @@ step mgr@EventManager{..} = do -- | Register interest in the given events, without waking the event -- manager thread. The 'Bool' return value indicates whether the -- event manager ought to be woken. +-- +-- Note that the event manager is generally implemented in terms of the +-- platform's @selectg@ or @epoll@ system call, which tend to vary in +-- what sort of fds are permitted. For instance, waiting on regular files +-- is not allowed on many platforms. registerFd_ :: EventManager -> IOCallback -> Fd -> Event -> Lifetime -> IO (FdKey, Bool) registerFd_ mgr@(EventManager{..}) cb fd evs lt = do |