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<h3>
Ben Gamari pushed to branch wip/T16546
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/466fb8462f0131a5acc0c36dbdb8689c89334d9b">466fb846</a></strong>
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<span>by Ben Gamari</span>
<i>at 2019-04-11T18:44:55Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Better document implementation implications of Data.Timeout
As noted in #16546 timeout uses asynchronous exceptions internally, an
implementation detail which can leak out in surprising ways. Note this
fact.
Also expose the `Timeout` tycon.
[skip ci]
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<h4>1 changed file:</h4>
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<a href="#7f4e105bb4723b80c9d4e9bc14db5f93a742e0aa">
libraries/base/System/Timeout.hs
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<h4>Changes:</h4>
<li id="7f4e105bb4723b80c9d4e9bc14db5f93a742e0aa">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/466fb8462f0131a5acc0c36dbdb8689c89334d9b#7f4e105bb4723b80c9d4e9bc14db5f93a742e0aa"><strong>libraries/base/System/Timeout.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">@@ -16,7 +16,7 @@</td>
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<pre style="margin: 0;"> <span id="LC16" 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="LC17" 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="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">System.Timeout</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">timeout</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">System.Timeout</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Timeout</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">timeout</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="n" style="color: #333;">mingw32_HOST_OS</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;">Control.Monad</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">@@ -35,7 +35,11 @@ import Data.Unique (Unique, newUnique)</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- interrupt the running IO computation when the timeout has</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expired.</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <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 4.0</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="cd">-- | An exception thrown to a thread by 'timeout' to interrupt a timed-out</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- computation.</span></span>
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<pre style="margin: 0;">+<span id="LC40" 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="LC41" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.0</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></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="cd">-- | @since 4.0</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="kr" style="font-weight: 600;">where</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">@@ -67,20 +71,25 @@ instance Exception Timeout where</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- another thread.</span></span>
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<pre style="margin: 0;"> <span id="LC72" 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="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A tricky implementation detail is the question of how to abort an @IO@</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- computation. This combinator relies on asynchronous exceptions internally.</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The technique works very well for computations executing inside of the</span></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Haskell runtime system, but it doesn't work at all for non-Haskell code.</span></span>
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Foreign function calls, for example, cannot be timed out with this</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- combinator simply because an arbitrary C function cannot receive</span></span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- asynchronous exceptions. When @timeout@ is used to wrap an FFI call that</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- blocks, no timeout event can be delivered until the FFI call returns, which</span></span>
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pretty much negates the purpose of the combinator. In practice, however,</span></span>
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this limitation is less severe than it may sound. Standard I\/O functions</span></span>
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<pre style="margin: 0;">-<span id="LC79" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- like 'System.IO.hGetBuf', 'System.IO.hPutBuf', Network.Socket.accept, or</span></span>
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<pre style="margin: 0;">-<span id="LC80" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'System.IO.hWaitForInput' appear to be blocking, but they really don't</span></span>
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- because the runtime system uses scheduling mechanisms like @select(2)@ to</span></span>
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- perform asynchronous I\/O, so it is possible to interrupt standard socket</span></span>
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<pre style="margin: 0;">-<span id="LC83" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- I\/O or file I\/O using this combinator.</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- computation. This combinator relies on asynchronous exceptions internally</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (namely throwing the computation the 'Timeout' exception). The technique</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- works very well for computations executing inside of the Haskell runtime</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- system, but it doesn't work at all for non-Haskell code. Foreign function</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- calls, for example, cannot be timed out with this combinator simply because</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- an arbitrary C function cannot receive asynchronous exceptions. When</span></span>
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80
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @timeout@ is used to wrap an FFI call that blocks, no timeout event can be</span></span>
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81
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- delivered until the FFI call returns, which pretty much negates the purpose</span></span>
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82
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of the combinator. In practice, however, this limitation is less severe than</span></span>
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83
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it may sound. Standard I\/O functions like 'System.IO.hGetBuf',</span></span>
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84
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'System.IO.hPutBuf', Network.Socket.accept, or 'System.IO.hWaitForInput'</span></span>
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85
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- appear to be blocking, but they really don't because the runtime system uses</span></span>
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86
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- scheduling mechanisms like @select(2)@ to perform asynchronous I\/O, so it</span></span>
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87
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is possible to interrupt standard socket I\/O or file I\/O using this</span></span>
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88
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- combinator.</span></span>
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89
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<pre style="margin: 0;">+<span id="LC89" 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="LC90" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that 'timeout' cancels the computation by throwing it the 'Timeout'</span></span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exception. Consequently blanket exception handlers (e.g. catching</span></span>
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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'SomeException') within the computation will break the timeout behavior.</span></span>
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84
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">timeout</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</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;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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85
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="n" style="color: #333;">timeout</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">f</span></span>
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86
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">f</span></span>
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