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<h3>
David Eichmann pushed to branch wip/io_uring
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/576e092b4a506a9b8bbc7702b03dbf80adb478fe">576e092b</a></strong>
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<span>by David Eichmann</span>
<i>at 2020-05-29T15:09:48+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor Event Manager Backend to allow for arbitrty asynchronous IO
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#4d05726fbbe8b9ed4afd74bfa38945903c03dd38">
libraries/base/GHC/Event/EPoll.hsc
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<li class="file-stats">
<a href="#c23bed179e65cee1485463017184f320e3184b8f">
libraries/base/GHC/Event/Internal.hs
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<li class="file-stats">
<a href="#1eecd86195ac019a9e8590ee2035512138a7960f">
libraries/base/GHC/Event/Manager.hs
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<li class="file-stats">
<a href="#b1e1421b2cc807278e3f984921929a2ba48b4f93">
libraries/base/GHC/Event/Poll.hsc
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<li class="file-stats">
<a href="#85dbb068e8c0d396ef1a7bb58f2679e3d9e65317">
libraries/base/GHC/Event/TimerManager.hs
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<h4>Changes:</h4>
<li id="4d05726fbbe8b9ed4afd74bfa38945903c03dd38">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/576e092b4a506a9b8bbc7702b03dbf80adb478fe#4d05726fbbe8b9ed4afd74bfa38945903c03dd38"><strong>libraries/base/GHC/Event/EPoll.hsc</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -71,7 +71,13 @@ new :: IO E.Backend</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">new = do</span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext"> epfd <- epollCreate</span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext"> evts <- A.new 64</span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext"> let !be = E.backend poll modifyFd modifyFdOnce delete (EPoll epfd evts)</span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext"> let !be = E.backend</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext"> poll</span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext"> modifyFd</span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="plaintext"> modifyFdOnce</span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext"> (\_ _ -> Nothing)</span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext"> delete</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext"> (EPoll epfd evts)</span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext"> return be</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext">delete :: EPoll -> IO ()</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -109,7 +115,7 @@ modifyFdOnce ep fd evt =</td>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="plaintext">-- events that are ready.</span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="plaintext">poll :: EPoll -- ^ state</span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="plaintext"> -> Maybe Timeout -- ^ timeout in milliseconds</span>
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="plaintext"> -> (<span class="idiff left right">Fd -> E.Event -> IO ())</span> -- ^ I/O callback</span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext"> -> (<span class="idiff left right">E.IOResult -> IO ()) </span> -- ^ I/O callback</span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext"> -> IO Int</span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">poll ep mtimeout f = do</span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext"> let events = epollEvents ep</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -122,7 +128,7 @@ poll ep mtimeout f = do</td>
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122
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="plaintext"> Nothing -> epollWaitNonBlock fd es cap</span>
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129
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="plaintext"> when (n > 0) $ do</span>
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125
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="plaintext"> A.forM_ events $ \e -> f (<span class="idiff left right">eventFd e) (toEvent (eventTypes e</span>))</span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext"> A.forM_ events $ \e -> f (<span class="idiff left right">E.IOResult_Event (eventFd e) (toEvent (eventTypes e)</span>))</span>
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126
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132
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="plaintext"> cap <- A.capacity events</span>
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127
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="plaintext"> when (cap == n) $ A.ensureCapacity events (2 * cap)</span>
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128
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext"> return n</span>
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<li id="c23bed179e65cee1485463017184f320e3184b8f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/576e092b4a506a9b8bbc7702b03dbf80adb478fe#c23bed179e65cee1485463017184f320e3184b8f"><strong>libraries/base/GHC/Event/Internal.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -6,6 +6,8 @@ module GHC.Event.Internal</td>
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6
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6
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Event back end</span></span>
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7
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Backend</span></span>
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8
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">backend</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IOAction</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IOResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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9
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11
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">delete</span></span>
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10
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12
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">poll</span></span>
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11
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13
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">modifyFd</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -38,6 +40,22 @@ import GHC.Num (Num(..))</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Show</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Semigroup.Internal</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">stimesMonoid</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IOAction</span> <span class="c1" style="color: #998; font-style: italic;">-- TODO add actions</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IOAction_Read IOActionID ...</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IOAction_Write IOActionID ...</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IOResult</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | An event has occurred for a file handle. See IOAction_SetFdEvents and</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IOAction_SetFdEventsOnce.</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IOResult_Event</span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="kt" style="color: #458; font-weight: 600;">Event</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IOResult_Read IOActionID ...</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IOResult_Write IOActionID ...</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="cd">-- | An I\/O event.</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 4.4.0.0</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -161,10 +179,11 @@ data Backend = forall a. Backend {</td>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Poll backend for new events. The provided callback is called</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- once per file descriptor with new events.</span></span>
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">_bePoll</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- backend state</span></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="c1" style="color: #998; font-style: italic;">-- timeout in milliseconds ('Nothing' for non-blocking poll)</span></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- I/O callback</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">_bePoll</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- backend state</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="c1" style="color: #998; font-style: italic;">-- timeout in milliseconds ('Nothing' for non-blocking poll)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="185" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IOResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- I/O callback</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="c1" style="color: #998; font-style: italic;">-- ???? negative is error, 0 is success but no IOResults found, positive is success with IO Results. ???</span></span>
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168
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"></span>
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169
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Register, modify, or unregister interest in the given events</span></span>
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170
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- on the given file descriptor.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="172" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -172,48 +191,60 @@ data Backend = forall a. Backend {</td>
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172
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="c1" style="color: #998; font-style: italic;">-- file descriptor</span></span>
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173
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192
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="c1" style="color: #998; font-style: italic;">-- old events to watch for ('mempty' for new)</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="c1" style="color: #998; font-style: italic;">-- new events to watch for ('mempty' to delete)</span></span>
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175
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- The Bool indicates True for success,</span></span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- False for a known failure, else this may throw</span></span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with `throwErrno`.</span></span>
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176
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Register interest in new events on a given file descriptor, set</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to be deactivated after the first event.</span></span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">_beModifyFdOnce</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="c1" style="color: #998; font-style: italic;">-- file descriptor</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="c1" style="color: #998; font-style: italic;">-- new events to watch</span></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- Bool indicates success (see _beModifyFd)</span></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Perform some IO action (non-blocking).</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">_beDoIOAction</span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IOAction</span> <span class="c1" style="color: #998; font-style: italic;">-- action to perform</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Nothing if the io action is not supported, and</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the caller should use Fd Events instead. Else</span></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just the action to do the (non-blocking) IO</span></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- action. Bool indicates success (see _beModifyFd).</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">_beDelete</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">backend</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Fd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Even</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="n" style="color: #333;">backend</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">IOResul</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IOAction</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span></span>
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="n" style="color: #333;">backend</span> <span class="n" style="color: #333;">bPoll</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="n" style="color: #333;">bDelete</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">bPoll</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="n" style="color: #333;">bDelete</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="n" style="color: #333;">backend</span> <span class="n" style="color: #333;">bPoll</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="n" style="color: #333;">bD<span class="idiff left">oIOAction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bD</span>elete</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">bPoll</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="n" style="color: #333;">bD<span class="idiff left">oIOAction</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bD</span>elete</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE backend #-}</span></span>
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227
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="n" style="color: #333;">poll</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Fd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Even</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="n" style="color: #333;">poll</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="n" style="color: #333;">bPoll</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bPoll</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"><span class="n" style="color: #333;">poll</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">IOResul</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="n" style="color: #333;">poll</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="n" style="color: #333;">bPoll</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bPoll</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE poll #-}</span></span>
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231
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"></span>
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232
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="cd">-- | Returns 'True' if the modification succeeded.</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns 'False' if this backend does not support</span></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- event notifications on this type of file.</span></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell"><span class="n" style="color: #333;">modifyFd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="n" style="color: #333;">modifyFd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">modifyFd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bModifyFd</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE modifyFd #-}</span></span>
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238
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"><span class="cd">-- | Returns 'True' if the modification succeeded.</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns 'False' if this backend does not support</span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- event notifications on this type of file.</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"><span class="n" style="color: #333;">modifyFdOnce</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"><span class="n" style="color: #333;">modifyFdOnce</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="n" style="color: #333;">modifyFdOnce</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="kr" style="font-weight: 600;">_</span><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bModifyFdOnce</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE modifyFdOnce #-}</span></span>
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245
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"><span class="n" style="color: #333;">delete</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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216
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"><span class="n" style="color: #333;">delete</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">bDelete</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bDelete</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"><span class="n" style="color: #333;">delete</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="n" style="color: #333;">bState</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">bDelete</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bDelete</span> <span class="n" style="color: #333;">bState</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE delete #-}</span></span>
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249
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"><span class="cd">-- | Throw an 'Prelude.IOError' corresponding to the current value of</span></span>
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<li id="1eecd86195ac019a9e8590ee2035512138a7960f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/576e092b4a506a9b8bbc7702b03dbf80adb478fe#1eecd86195ac019a9e8590ee2035512138a7960f"><strong>libraries/base/GHC/Event/Manager.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -293,12 +293,12 @@ step mgr@EventManager{..} = do</td>
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293
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="n" style="color: #333;">state</span> <span class="p">`</span><span class="n" style="color: #333;">seq</span><span class="p">`</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">state</span></span>
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294
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294
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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295
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295
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"> <span class="n" style="color: #333;">waitForIO</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num old old_line" data-linenumber="296" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
296
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<td class="diff-line-num new_line old" data-linenumber="296" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">n1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">poll</span> <span class="n" style="color: #333;">emBackend</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">on<span class="idiff left right">FdEven</span>t</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="296" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">n1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">poll</span> <span class="n" style="color: #333;">emBackend</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">on<span class="idiff left right">IOResul</span>t</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span></span>
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297
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297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">n1</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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298
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298
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="n" style="color: #333;">yield</span></span>
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299
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;">n2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">poll</span> <span class="n" style="color: #333;">emBackend</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">on<span class="idiff left right">FdEven</span>t</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;">n2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">poll</span> <span class="n" style="color: #333;">emBackend</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">on<span class="idiff left right">IOResul</span>t</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span></span>
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300
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300
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">n2</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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301
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">poll</span> <span class="n" style="color: #333;">emBackend</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">Forever</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">on<span class="idiff left right">FdEven</span>t</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">poll</span> <span class="n" style="color: #333;">emBackend</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">Forever</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">on<span class="idiff left right">IOResul</span>t</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span></span>
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302
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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303
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"></span>
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304
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304
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------------</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="444" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -444,6 +444,11 @@ closeFd_ mgr tbl fd = do</td>
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444
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------------</span></span>
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445
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Utilities</span></span>
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446
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446
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="haskell"><span class="cd">-- | Call the callbacks corresponding ot the given IOResult.</span></span>
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448
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="n" style="color: #333;">onIOResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EventManager</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">IOResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"><span class="n" style="color: #333;">onIOResult</span> <span class="n" style="color: #333;">em</span> <span class="n" style="color: #333;">ioResult</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ioResult</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">IOResult_Event</span> <span class="n" style="color: #333;">fd</span> <span class="n" style="color: #333;">events</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">onFdEvent</span> <span class="n" style="color: #333;">em</span> <span class="n" style="color: #333;">fd</span> <span class="n" style="color: #333;">events</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC452" class="line" lang="haskell"><span class="cd">-- | Call the callbacks corresponding to the given file descriptor.</span></span>
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"><span class="n" style="color: #333;">onFdEvent</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EventManager</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Event</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC454" class="line" lang="haskell"><span class="n" style="color: #333;">onFdEvent</span> <span class="n" style="color: #333;">mgr</span> <span class="n" style="color: #333;">fd</span> <span class="n" style="color: #333;">evs</span></span>
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<li id="b1e1421b2cc807278e3f984921929a2ba48b4f93">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/576e092b4a506a9b8bbc7702b03dbf80adb478fe#b1e1421b2cc807278e3f984921929a2ba48b4f93"><strong>libraries/base/GHC/Event/Poll.hsc</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -51,7 +51,7 @@ data Poll = Poll {</td>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"> }</span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">new :: IO E.Backend</span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="plaintext">new = E.backend poll modifyFd modifyFdOnce (\_ -> return ()) `liftM`</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">new = E.backend poll modifyFd modifyFdOnce (\_ <span class="idiff left right">_ -> Nothing) (\_ </span>-> return ()) `liftM`</span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"> liftM2 Poll (newMVar =<< A.empty) A.empty</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">modifyFd :: Poll -> Fd -> E.Event -> E.Event -> IO Bool</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -78,7 +78,7 @@ reworkFd p (PollFd fd npevt opevt) = do</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext">poll :: Poll</span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext"> -> Maybe E.Timeout</span>
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="plaintext"> -> (<span class="idiff left right">Fd -> E.Even</span>t -> IO ())</span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext"> -> (<span class="idiff left right">E.IOResul</span>t -> IO ())</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext"> -> IO Int</span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext">poll p mtout f = do</span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext"> let a = pollFd p</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -95,7 +95,7 @@ poll p mtout f = do</td>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext"> A.loop a 0 $ \i e -> do</span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="plaintext"> let r = pfdRevents e</span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext"> if r /= 0</span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext"> then do f (<span class="idiff left right">pfdFd e) (toEvent r</span>)</span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext"> then do f (<span class="idiff left right">E.IOResult_Event (pfdFd e) (toEvent r)</span>)</span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="plaintext"> let i' = i + 1</span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="plaintext"> return (i', i' == n)</span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext"> else return (i, True)</span>
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<li id="85dbb068e8c0d396ef1a7bb58f2679e3d9e65317">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/576e092b4a506a9b8bbc7702b03dbf80adb478fe#85dbb068e8c0d396ef1a7bb58f2679e3d9e65317"><strong>libraries/base/GHC/Event/TimerManager.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -50,9 +50,8 @@ import GHC.Num (Num(..))</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Real</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">quot</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fromIntegral</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Show</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Event.Control</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Event.Internal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Event</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">evtRead</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Event.Internal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backend</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">evtRead</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Event.Unique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unique</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UniqueSource</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newSource</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newUnique</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Posix.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Fd</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Event.Internal</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">I</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Event.PSQ</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Q</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -99,13 +98,15 @@ data TimerManager = TimerManager</td>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Creation</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">handleControlEvent</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TimerManager</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Fd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Even</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">handleControlEvent</span> <span class="n" style="color: #333;">mgr</span> <span class="n" style="color: #333;"><span class="idiff left">fd</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">_evt</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="n" style="color: #333;">handleControlEvent</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TimerManager</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">I</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">IOResul</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">handleControlEvent</span> <span class="n" style="color: #333;">mgr</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">I</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">IOResult_Event</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fd</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_evt</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readControlMessage</span> <span class="p">(</span><span class="n" style="color: #333;">emControl</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span> <span class="n" style="color: #333;">fd</span></span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">msg</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CMsgWakeup</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CMsgDie</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">writeIORef</span> <span class="p">(</span><span class="n" style="color: #333;">emState</span> <span class="n" style="color: #333;">mgr</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Finished</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CMsgSignal</span> <span class="n" style="color: #333;">fp</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">runHandlers</span> <span class="n" style="color: #333;">fp</span> <span class="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TimerManager should only use the event api of the backend to wait on timers.</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- handleControlEvent _ _ = errorWithoutStackTrace "unexpected non-event IO result"</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">newDefaultBackend</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span></span>
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111
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HAVE_POLL</span><span class="p">)</span></span>
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