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<h3>
Marge Bot pushed to branch master
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/c05756cdef800f1d8e92114222bcc480bce758b9">c05756cd</a></strong>
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<span>by Niklas Hambüchen</span>
<i>at 2020-06-04T04:35:24-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: Add more details on InterruptibleFFI.
Details from https://gitlab.haskell.org/ghc/ghc/issues/8684
and https://github.com/takano-akio/filelock/pull/7#discussion_r280332430
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<h4>1 changed file:</h4>
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<a href="#f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2">
docs/users_guide/exts/ffi.rst
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<h4>Changes:</h4>
<li id="f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c05756cdef800f1d8e92114222bcc480bce758b9#f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2"><strong>docs/users_guide/exts/ffi.rst</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">@@ -301,7 +301,8 @@ to the user interrupt.</td>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="plaintext"></span>
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<td class="diff-line-num old_line" data-linenumber="302" 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">
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="plaintext">The problem is that it is not possible in general to interrupt a foreign</span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="plaintext">call safely. However, GHC does provide a way to interrupt blocking</span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="plaintext">system calls which works for most system calls on both Unix and Windows.</span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="plaintext">*system* calls which works for most system calls on both Unix and Windows.</span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="plaintext">When the ``InterruptibleFFI`` extension is enabled, a foreign call can</span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="plaintext">be annotated with ``interruptible`` instead of ``safe`` or ``unsafe``: ::</span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="plaintext"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="326" 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">@@ -325,12 +326,38 @@ Windows systems</td>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="plaintext"> ``CancelSynchronousIo``, which will cause a blocking I/O operation</span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="plaintext"> to return with the error ``ERROR_OPERATION_ABORTED``.</span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="plaintext">If the system call is successfully interrupted, it will return to</span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="plaintext">Haskell whereupon the exception can be raised. Be especially careful</span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="plaintext">when using ``interruptible`` that the caller of the foreign function is</span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="plaintext">prepared to deal with the consequences of the call being interrupted; on</span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="plaintext">Unix it is good practice to check for ``EINTR`` always, but on Windows</span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="plaintext">it is not typically necessary to handle ``ERROR_OPERATION_ABORTED``.</span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="plaintext">Once the system call is successfully interrupted, the surrounding</span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="plaintext">code must return control out of the ``foreign import``, back into Haskell code,</span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="plaintext">so that the ``throwTo`` Haskell exception can be raised there.</span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="plaintext">If the foreign code simply retries the system call directly without returning</span>
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334
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="plaintext">back to Haskell, then the intended effect of `interruptible` disappears</span>
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335
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="plaintext">and functions like :base-ref:`System.Timeout.timeout` will not work.</span>
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336
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="plaintext"></span>
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337
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="plaintext">Finally, after the ``interruptible`` foreign call returns into Haskell, the</span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="plaintext">Haskell code should allow exceptions to be raised</span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="plaintext">(``Control.Exception``'s ``allowInterrupt``, or ``interruptible yield``</span>
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340
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="plaintext">for non-``-threaded``, see https://gitlab.haskell.org/ghc/ghc/issues/8684),</span>
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341
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="plaintext">and implement the ``EINTR``-retrying in Haskell</span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="plaintext">(e.g. using e.g. :base-ref:`Foreign.C.Error.throwErrnoIfMinus1Retry`).</span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="plaintext">Be especially careful when using ``interruptible`` to check that that</span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="plaintext">the called foreign function is prepared to deal with the consequences</span>
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346
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="plaintext">of the call being interrupted.</span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="plaintext">On Unix it is considered good practice to always check for ``EINTR`` after</span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="plaintext">system calls, so you can expect it not to crash (but in that case</span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="plaintext">``interruptible`` will not work as intended unless the code then returns</span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="plaintext">all the way up to Haskell as described above).</span>
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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="plaintext">But on Windows it is not typically common practice to handle</span>
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352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="plaintext">``ERROR_OPERATION_ABORTED``.</span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="plaintext">The approach works *only* for foreign code that does I/O (system calls),</span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="plaintext">not for CPU-intensive computations that do not do any system calls.</span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="plaintext">This is because the only way by which the foreign code can observe</span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="plaintext">interruption is by system calls returning interruption error codes.</span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="plaintext">To be able to interrupt long-running foreign code doing no system calls,</span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="plaintext">the code must likely be changed to explicitly check for intended</span>
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360
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="plaintext">early termination.</span>
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334
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361
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="plaintext"></span>
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335
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362
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="plaintext">.. _ffi-capi:</span>
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363
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="plaintext"></span>
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