Add std::scoped_lock for C++17
* doc/xml/manual/status_cxx2017.xml: Document P0156R2 status. * doc/html/*: Regenerate. * include/std/mutex (scoped_lock): Implement new C++17 template. * testsuite/30_threads/scoped_lock/cons/1.cc: New test. * testsuite/30_threads/scoped_lock/requirements/ explicit_instantiation.cc: New test. * testsuite/30_threads/scoped_lock/requirements/typedefs.cc: New test. From-SVN: r245903
This commit is contained in:
Jonathan Wakely
Jonathan Wakely
parent
d8b4baeb45
commit
f620e1d5c8
16 changed files with 301 additions and 29 deletions
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@ -1,3 +1,13 @@
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2017-03-05 Jonathan Wakely <jwakely@redhat.com>
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* doc/xml/manual/status_cxx2017.xml: Document P0156R2 status.
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* doc/html/*: Regenerate.
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* include/std/mutex (scoped_lock): Implement new C++17 template.
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* testsuite/30_threads/scoped_lock/cons/1.cc: New test.
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* testsuite/30_threads/scoped_lock/requirements/
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explicit_instantiation.cc: New test.
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* testsuite/30_threads/scoped_lock/requirements/typedefs.cc: New test.
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2017-03-02 Gerald Pfeifer <gerald@pfeifer.com>
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François Dumont <frs.dumont@gmail.com>
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Jonathan Wakely <jwakely@redhat.com>
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@ -161,7 +161,7 @@
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DRD</a>,
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<a class="link" href="http://valgrind.org/docs/manual/hg-manual.html" target="_top">
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Helgrind</a>, and
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<a class="link" href="https://code.google.com/p/data-race-test/" target="_top">
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<a class="link" href="https://github.com/google/sanitizers" target="_top">
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ThreadSanitizer</a> (this refers to ThreadSanitizer v1, not the
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new "tsan" feature built-in to GCC itself).
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</p><p>
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@ -191,15 +191,11 @@ template<typename _Tp, typename _Allocator = allocator<_Tp>
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perform, shortening the detect-compile-debug bug hunting cycle
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and making the debug mode easier to incorporate into development
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environments by minimizing dependencies.</p><p>Achieving link- and run-time coexistence is not a trivial
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implementation task. To achieve this goal we required a small
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extension to the GNU C++ compiler (since incorporated into the C++11 language specification, described in the GCC Manual for the C++ language as
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<a class="link" href="http://gcc.gnu.org/onlinedocs/gcc/Namespace-Association.html#Namespace-Association" target="_top">namespace
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association</a>), and a complex organization of debug- and
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release-modes. The end result is that we have achieved per-use
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recompilation but have had to give up some checking of the
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<code class="code">std::basic_string</code> class template (namely, safe
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iterators).
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</p><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="methods.coexistence.compile"></a>Compile-time coexistence of release- and debug-mode components</h5></div></div></div><p>Both the release-mode components and the debug-mode
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implementation task. To achieve this goal we use inline namespaces and
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a complex organization of debug- and release-modes. The end result is
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that we have achieved per-use recompilation but have had to give up
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some checking of the <code class="code">std::basic_string</code> class template
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(namely, safe iterators).</p><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="methods.coexistence.compile"></a>Compile-time coexistence of release- and debug-mode components</h5></div></div></div><p>Both the release-mode components and the debug-mode
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components need to exist within a single translation unit so that
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the debug versions can wrap the release versions. However, only one
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of these components should be user-visible at any particular
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@ -114,7 +114,7 @@
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<span class="emphasis"><em>ps</em></span>, and <span class="emphasis"><em>dvi</em></span>.
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</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="doc.doxygen"></a>Doxygen</h3></div></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="doxygen.prereq"></a>Prerequisites</h4></div></div></div><div class="table"><a id="table.doxygen_prereq"></a><p class="title"><strong>Table B.1. Doxygen Prerequisites</strong></p><div class="table-contents"><table summary="Doxygen Prerequisites" border="1"><colgroup><col align="center" class="c1" /><col align="center" class="c2" /><col align="center" class="c3" /></colgroup><thead><tr><th align="center">Tool</th><th align="center">Version</th><th align="center">Required By</th></tr></thead><tbody><tr><td align="center">coreutils</td><td align="center">8.5</td><td align="center">all</td></tr><tr><td align="center">bash</td><td align="center">4.1</td><td align="center">all</td></tr><tr><td align="center">doxygen</td><td align="center">1.7.6.1</td><td align="center">all</td></tr><tr><td align="center">graphviz</td><td align="center">2.26</td><td align="center">graphical hierarchies</td></tr><tr><td align="center">pdflatex</td><td align="center">2007-59</td><td align="center">pdf output</td></tr></tbody></table></div></div><br class="table-break" /><p>
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Prerequisite tools are Bash 2.0 or later,
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<a class="link" href="http://www.doxygen.org/" target="_top">Doxygen</a>, and
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<a class="link" href="http://www.doxygen.org" target="_top">Doxygen</a>, and
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the <a class="link" href="http://www.gnu.org/software/coreutils/" target="_top">GNU
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coreutils</a>. (GNU versions of find, xargs, and possibly
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sed and grep are used, just because the GNU versions make
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|
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@ -137,8 +137,8 @@
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</p><p>
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An instructive thread from comp.lang.c++.moderated delved off into
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this topic starting more or less at
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<a class="link" href="http://groups.google.com/group/comp.std.c++/browse_thread/thread/f87b4abd7954a87/946a3eb9921e382d?q=comp.std.c%2B%2B+binary+iostream#946a3eb9921e382d" target="_top">this</a>
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post and continuing to the end of the thread. (The subject heading is "binary iostreams" on both comp.std.c++
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<a class="link" href="https://groups.google.com/forum/#!topic/comp.std.c++/D4e0q9eVSoc" target="_top">this post</a>
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and continuing to the end of the thread. (The subject heading is "binary iostreams" on both comp.std.c++
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and comp.lang.c++.moderated.) Take special note of the replies by James Kanze and Dietmar Kühl.
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</p><p>Briefly, the problems of byte ordering and type sizes mean that
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the unformatted functions like <code class="code">ostream::put()</code> and
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@ -671,7 +671,7 @@ be private.
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</em>. </span><span class="subtitle">
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N2461
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. </span></p></div><div class="biblioentry"><a id="id-1.3.4.4.4.5.8.5"></a><p><span class="title"><em>
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<a class="link" href="http://boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">
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<a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">
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Boost C++ Libraries documentation, shared_ptr
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</a>
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</em>. </span><span class="subtitle">
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|
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@ -834,7 +834,7 @@
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</span>. </span><span class="publisher"><span class="publishername">
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Generic Programming
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. </span></span></p></div><div class="biblioentry"><a id="biblio.dawestimer"></a><p>[biblio.dawestimer] <span class="title"><em>
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<a class="link" href="http://www.boost.org/doc/libs/release/libs/timer/" target="_top">
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<a class="link" href="http://www.boost.org/libs/timer/" target="_top">
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Boost Timer Library
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</a>
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</em>. </span><span class="author"><span class="firstname">
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|
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@ -844,7 +844,7 @@
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</span>. </span><span class="publisher"><span class="publishername">
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Boost
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. </span></span></p></div><div class="biblioentry"><a id="biblio.clearypool"></a><p>[biblio.clearypool] <span class="title"><em>
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<a class="link" href="http://www.boost.org/doc/libs/release/libs/pool/" target="_top">
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<a class="link" href="http://www.boost.org/libs/pool/" target="_top">
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Boost Pool Library
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</a>
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</em>. </span><span class="author"><span class="firstname">
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||||
|
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@ -854,7 +854,7 @@
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</span>. </span><span class="publisher"><span class="publishername">
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Boost
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. </span></span></p></div><div class="biblioentry"><a id="biblio.maddocktraits"></a><p>[biblio.maddocktraits] <span class="title"><em>
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<a class="link" href="http://www.boost.org/doc/libs/release/libs/type_traits/" target="_top">
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||||
<a class="link" href="http://www.boost.org/libs/type_traits/" target="_top">
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Boost Type Traits Library
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</a>
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</em>. </span><span class="authorgroup"><span class="firstname">
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|
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@ -18,7 +18,7 @@
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reverse iteration can be performed efficiently.
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</p></li></ol></div><p>
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Some test utilities borrow ideas from
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<a class="link" href="http://www.boost.org/doc/libs/release/libs/timer/index.html" target="_top">boost::timer</a>.
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<a class="link" href="http://www.boost.org/libs/timer/" target="_top">boost::timer</a>.
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</p><p>
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We would like to thank Scott Meyers for useful comments (without
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attributing to him any flaws in the design or implementation of the
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|
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@ -11,7 +11,7 @@
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various components at interesting entry/exit points to/from the standard
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library. Process trace, recognize suboptimal patterns, give advice.
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For details, see the
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<a class="link" href="http://http://ieeexplore.ieee.org/document/4907670/" target="_top">Perflint
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<a class="link" href="http://ieeexplore.ieee.org/document/4907670/" target="_top">Perflint
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paper presented at CGO 2009</a>.
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</p><p>
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<span class="emphasis"><em>Strengths: </em></span>
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@ -60,7 +60,7 @@
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call stack of its constructor location.
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</p><p>
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For details, see
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<a class="link" href="http://dx.doi.org/10.1109/CGO.2009.36" target="_top">paper presented at
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<a class="link" href="http://ieeexplore.ieee.org/document/4907670/" target="_top">paper presented at
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CGO 2009</a>.
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</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.ext.profile_mode.design.analysis"></a>Analysis and Diagnostics</h3></div></div></div><p>
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Final analysis takes place offline, and it is based entirely on the
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|
|
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@ -776,11 +776,11 @@ Feature-testing recommendations for C++</a>.
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<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4508.html" target="_top">
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N4508
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</a>
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</td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_shared_mutex >= 201505 </code></td></tr><tr bgcolor="#C8B0B0"><td align="left"> Variadic <code class="code">lock_guard</code> </td><td align="left">
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<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0156r0.html" target="_top">
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P0156R0
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</td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_shared_mutex >= 201505 </code></td></tr><tr><td align="left"> Variadic <code class="code">lock_guard</code> </td><td align="left">
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<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0156r2.html" target="_top">
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P0156R2
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</a>
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</td><td align="center"> No </td><td align="left"><code class="code"> __cpp_lib_lock_guard_variadic >= 201510 </code></td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.cxx1z_ts_status"></a><p class="title"><strong>Table 1.6. C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
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</td><td align="center"> 7 </td><td align="left"><code class="code"> __cpp_lib_scoped_lock >= 201703 </code></td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.cxx1z_ts_status"></a><p class="title"><strong>Table 1.6. C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
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<a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4076.html" target="_top">
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N4076
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</a>
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@ -719,15 +719,14 @@ Feature-testing recommendations for C++</link>.
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</row>
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<row>
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<?dbhtml bgcolor="#C8B0B0" ?>
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<entry> Variadic <code>lock_guard</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0156r0.html">
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P0156R0
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0156r2.html">
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P0156R2
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</link>
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</entry>
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<entry align="center"> No </entry>
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<entry><code> __cpp_lib_lock_guard_variadic >= 201510 </code></entry>
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<entry align="center"> 7 </entry>
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<entry><code> __cpp_lib_scoped_lock >= 201703 </code></entry>
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</row>
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</tbody>
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@ -556,6 +556,74 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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}
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}
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#if __cplusplus > 201402L
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#define __cpp_lib_scoped_lock 201703
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/** @brief A scoped lock type for multiple lockable objects.
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*
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* A scoped_lock controls mutex ownership within a scope, releasing
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* ownership in the destructor.
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*/
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template<typename... _MutexTypes>
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class scoped_lock
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{
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public:
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explicit scoped_lock(_MutexTypes&... __m) : _M_devices(std::tie(__m...))
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{ std::lock(__m...); }
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explicit scoped_lock(_MutexTypes&... __m, adopt_lock_t) noexcept
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: _M_devices(std::tie(__m...))
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{ } // calling thread owns mutex
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~scoped_lock()
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{
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std::apply([](_MutexTypes&... __m) {
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char __i[] __attribute__((__unused__)) = { (__m.unlock(), 0)... };
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}, _M_devices);
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}
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scoped_lock(const scoped_lock&) = delete;
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scoped_lock& operator=(const scoped_lock&) = delete;
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private:
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tuple<_MutexTypes&...> _M_devices;
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};
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template<>
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class scoped_lock<>
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{
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public:
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explicit scoped_lock() = default;
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explicit scoped_lock(adopt_lock_t) noexcept { }
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~scoped_lock() = default;
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scoped_lock(const scoped_lock&) = delete;
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scoped_lock& operator=(const scoped_lock&) = delete;
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};
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template<typename _Mutex>
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class scoped_lock<_Mutex>
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{
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public:
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using mutex_type = _Mutex;
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explicit scoped_lock(mutex_type& __m) : _M_device(__m)
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{ _M_device.lock(); }
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explicit scoped_lock(mutex_type& __m, adopt_lock_t) noexcept
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: _M_device(__m)
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{ } // calling thread owns mutex
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~scoped_lock()
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{ _M_device.unlock(); }
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scoped_lock(const scoped_lock&) = delete;
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scoped_lock& operator=(const scoped_lock&) = delete;
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private:
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mutex_type& _M_device;
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};
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#endif // C++17
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#ifdef _GLIBCXX_HAS_GTHREADS
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/// once_flag
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struct once_flag
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133
libstdc++-v3/testsuite/30_threads/scoped_lock/cons/1.cc
Normal file
133
libstdc++-v3/testsuite/30_threads/scoped_lock/cons/1.cc
Normal file
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@ -0,0 +1,133 @@
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// { dg-options "-std=gnu++17" }
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// { dg-do run { target c++1z } }
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// { dg-require-cstdint "" }
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||||
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||||
// Copyright (C) 2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
|
||||
// software; you can redistribute it and/or modify it under the
|
||||
// terms of the GNU General Public License as published by the
|
||||
// Free Software Foundation; either version 3, or (at your option)
|
||||
// any later version.
|
||||
|
||||
// This library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
|
||||
// You should have received a copy of the GNU General Public License along
|
||||
// with this library; see the file COPYING3. If not see
|
||||
// <http://www.gnu.org/licenses/>.
|
||||
|
||||
|
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#include <mutex>
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||||
#include <testsuite_hooks.h>
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struct BasicLockable
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{
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||||
BasicLockable() : locked(false) { }
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|
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~BasicLockable() noexcept(false)
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{
|
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if (locked)
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throw 0;
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}
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void lock()
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{
|
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if (locked)
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throw 0;
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locked = true;
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}
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void unlock()
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{
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if (!locked)
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throw 0;
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locked = false;
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}
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bool locked;
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};
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template<int>
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struct Lockable
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{
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||||
BasicLockable m;
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void lock() { m.lock(); }
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void unlock() { m.unlock(); }
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||||
bool try_lock() { if (m.locked) return false; m.lock(); return true; }
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||||
};
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||||
|
||||
void test01()
|
||||
{
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||||
BasicLockable m;
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try
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{
|
||||
std::scoped_lock<BasicLockable> l(m);
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VERIFY( m.locked );
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}
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catch (...)
|
||||
{
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VERIFY( false );
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||||
}
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||||
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VERIFY( !m.locked );
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||||
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m.lock();
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|
||||
try
|
||||
{
|
||||
std::scoped_lock<BasicLockable> l(m, std::adopt_lock);
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
VERIFY( false );
|
||||
}
|
||||
|
||||
VERIFY( !m.locked );
|
||||
}
|
||||
|
||||
void test02()
|
||||
{
|
||||
Lockable<1> m1;
|
||||
Lockable<2> m2;
|
||||
|
||||
try
|
||||
{
|
||||
std::scoped_lock<Lockable<1>, Lockable<2>> l(m1, m2);
|
||||
VERIFY( m1.m.locked );
|
||||
VERIFY( m2.m.locked );
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
VERIFY( false );
|
||||
}
|
||||
|
||||
VERIFY( !m1.m.locked );
|
||||
VERIFY( !m2.m.locked );
|
||||
|
||||
m1.lock();
|
||||
m2.lock();
|
||||
|
||||
try
|
||||
{
|
||||
std::scoped_lock<Lockable<1>, Lockable<2>> l(m1, m2, std::adopt_lock);
|
||||
VERIFY( m1.m.locked );
|
||||
VERIFY( m2.m.locked );
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
VERIFY( false );
|
||||
}
|
||||
|
||||
VERIFY( !m1.m.locked );
|
||||
VERIFY( !m2.m.locked );
|
||||
}
|
||||
|
||||
int main()
|
||||
{
|
||||
test01();
|
||||
test02();
|
||||
}
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
// { dg-options "-std=gnu++17" }
|
||||
// { dg-do compile { target c++1z } }
|
||||
// { dg-require-cstdint "" }
|
||||
// { dg-require-gthreads "" }
|
||||
|
||||
// Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
//
|
||||
// This file is part of the GNU ISO C++ Library. This library is free
|
||||
// software; you can redistribute it and/or modify it under the
|
||||
// terms of the GNU General Public License as published by the
|
||||
// Free Software Foundation; either version 3, or (at your option)
|
||||
// any later version.
|
||||
|
||||
// This library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
|
||||
// You should have received a copy of the GNU General Public License along
|
||||
// with this library; see the file COPYING3. If not see
|
||||
// <http://www.gnu.org/licenses/>.
|
||||
|
||||
|
||||
// NB: This file is for testing with NO OTHER INCLUDES.
|
||||
|
||||
#include <mutex>
|
||||
|
||||
namespace std
|
||||
{
|
||||
template class scoped_lock<>;
|
||||
template class scoped_lock<mutex>;
|
||||
template class scoped_lock<recursive_mutex, mutex>;
|
||||
}
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
// { dg-options "-std=gnu++17" }
|
||||
// { dg-do compile { target c++1z } }
|
||||
// { dg-require-cstdint "" }
|
||||
// { dg-require-gthreads "" }
|
||||
|
||||
// Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
//
|
||||
// This file is part of the GNU ISO C++ Library. This library is free
|
||||
// software; you can redistribute it and/or modify it under the
|
||||
// terms of the GNU General Public License as published by the
|
||||
// Free Software Foundation; either version 3, or (at your option)
|
||||
// any later version.
|
||||
|
||||
// This library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
|
||||
// You should have received a copy of the GNU General Public License along
|
||||
// with this library; see the file COPYING3. If not see
|
||||
// <http://www.gnu.org/licenses/>.
|
||||
|
||||
|
||||
// NB: This file is for testing with NO OTHER INCLUDES.
|
||||
|
||||
#include <mutex>
|
||||
|
||||
void test01()
|
||||
{
|
||||
// Check for required typedefs
|
||||
typedef std::scoped_lock<std::mutex> test_type;
|
||||
typedef test_type::mutex_type mutex_type;
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue