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<h3>
Ben Gamari pushed to branch wip/T15616
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/353e1230538a9adeca25930d57190a6df88a4cdc">353e1230</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-06-24T14:55:37-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Better error message on invalid getSystemTimerManager call
Previously we would produce a rather unhelpful pattern match failure
error in the case where the user called `getSystemTimerManager` in a
program which isn't built with `-threaded`. This understandably confused
the user in #15616.
Fixes #15616.
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<h4>1 changed file:</h4>
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<a href="#85027f4b37c07925334b1e4215f1cd73816e69c4">
libraries/base/GHC/Event/Thread.hs
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<h4>Changes:</h4>
<li id="85027f4b37c07925334b1e4215f1cd73816e69c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/353e1230538a9adeca25930d57190a6df88a4cdc#85027f4b37c07925334b1e4215f1cd73816e69c4"><strong>libraries/base/GHC/Event/Thread.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">@@ -19,6 +19,7 @@ module GHC.Event.Thread</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Exception</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">finally</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toException</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Foldable</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">forM_</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapM_</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sequence_</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.IORef</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IORef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newIORef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">readIORef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">writeIORef</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">fromMaybe</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Tuple</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">snd</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C.Error</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">eBADF</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">errnoToIOError</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CInt</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">CUInt</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="213" 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>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="214" 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>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -213,8 +214,9 @@ ioManagerLock = unsafePerformIO $ do</td>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"><span class="n" style="color: #333;">getSystemTimerManager</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;">TM</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TimerManager</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"><span class="n" style="color: #333;">getSystemTimerManager</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="LC216" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">mgr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readIORef</span> <span class="n" style="color: #333;">timerManager</span></span>
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">mgr</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">err</span> <span class="p">`</span><span class="n" style="color: #333;">fmap</span><span class="p">`</span> <span class="n" style="color: #333;">readIORef</span> <span class="n" style="color: #333;">timerManager</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="n" style="color: #333;">err</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"GHC.Event.Thread.getSystemTimerManager: the TimerManager requires linking against the threaded runtime"</span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"getOrSetSystemTimerThreadEventManagerStore"</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">getOrSetSystemTimerThreadEventManagerStore</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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