Implement Pp0156r2: 'Variadic Lock Guard, version 5' Reviewed as https://reviews.llvm.org/D31163.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@298681 91177308-0d34-0410-b5e6-96231b3b80d8

include/__config

@@ -49,7 +49,6 @@
 #define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB
 #define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB
 #define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 // Don't use a nullptr_t simulation type in C++03 instead using C++11 nullptr
 // provided under the alternate keyword __nullptr, which changes the mangling
 // of nullptr_t. This option is ABI incompatible with GCC in C++03 mode.
@@ -1076,6 +1075,10 @@ _LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container(
 # define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
 #endif // _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES
 
+#if !defined(__cpp_deduction_guides) || __cpp_deduction_guides < 201611
+# define _LIBCPP_HAS_NO_DEDUCTION_GUIDES
+#endif
+
 #endif // __cplusplus
 
 #endif // _LIBCPP_CONFIG

include/__mutex_base

@@ -80,21 +80,9 @@ constexpr adopt_lock_t  adopt_lock  = adopt_lock_t();
 
 #endif
 
-
-// Forward declare lock_guard as a variadic template even in C++03 to keep
-// the mangling consistent between dialects.
-#if defined(_LIBCPP_ABI_VARIADIC_LOCK_GUARD)
-template <class ..._Mutexes>
-class _LIBCPP_TEMPLATE_VIS lock_guard;
-#endif
-
 template <class _Mutex>
 class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable)
-#if !defined(_LIBCPP_ABI_VARIADIC_LOCK_GUARD)
 lock_guard
-#else
-lock_guard<_Mutex>
-#endif
 {
 public:
     typedef _Mutex mutex_type;

include/mutex

@@ -109,15 +109,17 @@ public:
     lock_guard& operator=(lock_guard const&) = delete;
 };
 
-template <class... MutexTypes> // Variadic lock_guard only provided in ABI V2.
+template <class... MutexTypes>
-class lock_guard
+class scoped_lock // C++17
 {
 public:
-    explicit lock_guard(MutexTypes&... m);
+    using mutex_type = Mutex;  // If MutexTypes... consists of the single type Mutex
-    lock_guard(MutexTypes&... m, adopt_lock_t);
+
-    ~lock_guard();
+    explicit scoped_lock(MutexTypes&... m);
-    lock_guard(lock_guard const&) = delete;
+    scoped_lock(MutexTypes&... m, adopt_lock_t);
-    lock_guard& operator=(lock_guard const&) = delete;
+    ~scoped_lock();
+    scoped_lock(scoped_lock const&) = delete;
+    scoped_lock& operator=(scoped_lock const&) = delete;
 private:
     tuple<MutexTypes&...> pm; // exposition only
 };
@@ -614,50 +616,72 @@ call_once(once_flag& __flag, const _Callable& __func)
 
 #endif  // _LIBCPP_HAS_NO_VARIADICS
 
+#if _LIBCPP_STD_VER > 14
+template <class ..._Mutexes>
+class _LIBCPP_TEMPLATE_VIS scoped_lock;
 
-#if defined(_LIBCPP_ABI_VARIADIC_LOCK_GUARD) \
-    && !defined(_LIBCPP_CXX03_LANG)
 template <>
-class _LIBCPP_TEMPLATE_VIS lock_guard<> {
+class _LIBCPP_TEMPLATE_VIS scoped_lock<> {
 public:
-    explicit lock_guard() {}
+    explicit scoped_lock() {}
-    ~lock_guard() = default;
+    ~scoped_lock() = default;
 
     _LIBCPP_INLINE_VISIBILITY
-    explicit lock_guard(adopt_lock_t) {}
+    explicit scoped_lock(adopt_lock_t) {}
 
-    lock_guard(lock_guard const&) = delete;
+    scoped_lock(scoped_lock const&) = delete;
-    lock_guard& operator=(lock_guard const&) = delete;
+    scoped_lock& operator=(scoped_lock const&) = delete;
+};
+
+template <class _Mutex>
+class _LIBCPP_TEMPLATE_VIS scoped_lock<_Mutex> {
+public:
+    typedef _Mutex  mutex_type;
+private:
+    mutex_type& __m_;
+public:
+    explicit scoped_lock(mutex_type & __m) _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
+        : __m_(__m) {__m_.lock();}
+
+    ~scoped_lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) {__m_.unlock();}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit scoped_lock(mutex_type& __m, adopt_lock_t) _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
+        : __m_(__m) {}
+    
+
+    scoped_lock(scoped_lock const&) = delete;
+    scoped_lock& operator=(scoped_lock const&) = delete;
 };
 
 template <class ..._MArgs>
-class _LIBCPP_TEMPLATE_VIS lock_guard
+class _LIBCPP_TEMPLATE_VIS scoped_lock
 {
-    static_assert(sizeof...(_MArgs) >= 2, "At least 2 lock types required");
+    static_assert(sizeof...(_MArgs) > 1, "At least 2 lock types required");
     typedef tuple<_MArgs&...> _MutexTuple;
 
 public:
     _LIBCPP_INLINE_VISIBILITY
-    explicit lock_guard(_MArgs&... __margs)
+    explicit scoped_lock(_MArgs&... __margs)
       : __t_(__margs...)
     {
         _VSTD::lock(__margs...);
     }
 
     _LIBCPP_INLINE_VISIBILITY
-    lock_guard(_MArgs&... __margs, adopt_lock_t)
+    scoped_lock(_MArgs&... __margs, adopt_lock_t)
         : __t_(__margs...)
     {
     }
 
     _LIBCPP_INLINE_VISIBILITY
-    ~lock_guard() {
+    ~scoped_lock() {
         typedef typename __make_tuple_indices<sizeof...(_MArgs)>::type _Indices;
         __unlock_unpack(_Indices{}, __t_);
     }
 
-    lock_guard(lock_guard const&) = delete;
+    scoped_lock(scoped_lock const&) = delete;
-    lock_guard& operator=(lock_guard const&) = delete;
+    scoped_lock& operator=(scoped_lock const&) = delete;
 
 private:
     template <size_t ..._Indx>
@@ -669,7 +693,7 @@ private:
     _MutexTuple __t_;
 };
 
-#endif // _LIBCPP_ABI_VARIADIC_LOCK_GUARD
+#endif // _LIBCPP_STD_VER > 14
 
 _LIBCPP_END_NAMESPACE_STD
 

test/libcxx/thread/thread.mutex/thread.lock/thread.lock.guard/variadic_mutex_mangling.pass.cpp

@@ -1,37 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// UNSUPPORTED: libcpp-has-no-threads
-
-// TODO(EricWF) Investigate why typeid(...).name() returns a different string
-// on GCC 4.9 but not newer GCCs.
-// XFAIL: gcc-4.9
-// XFAIL: windows
-
-// THIS TESTS C++03 EXTENSIONS.
-
-// <mutex>
-
-// template <class ...Mutex> class lock_guard;
-
-// Test that the the variadic lock guard implementation mangles the same in
-// C++11 and C++03. This is important since the mangling of `lock_guard` depends
-// on it being declared as a variadic template, even in C++03.
-
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#include <mutex>
-#include <string>
-#include <typeinfo>
-#include <cassert>
-
-int main() {
-    const std::string expect = "NSt3__110lock_guardIJNS_5mutexEEEE";
-    assert(typeid(std::lock_guard<std::mutex>).name() == expect);
-}

test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp

@@ -15,11 +15,16 @@
 
 // explicit lock_guard(mutex_type& m);
 
+// template<class _Mutex> lock_guard(lock_guard<_Mutex>)
+//     -> lock_guard<_Mutex>;  // C++17
+
 #include <mutex>
 #include <thread>
 #include <cstdlib>
 #include <cassert>
 
+#include "test_macros.h"
+
 std::mutex m;
 
 typedef std::chrono::system_clock Clock;
@@ -47,4 +52,9 @@ int main()
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+    
+#ifdef __cpp_deduction_guides
+    std::lock_guard lg(m);
+    static_assert((std::is_same<decltype(lg), std::lock_guard<decltype(m)>>::value), "" );
+#endif
 }

test/std/thread/thread.mutex/thread.lock/thread.lock.guard/variadic_mutex_cxx03.pass.cpp

@@ -1,21 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// UNSUPPORTED: libcpp-has-no-threads
-// <mutex>
-
-// template <class ...Mutex> class lock_guard;
-
-// Test that the variadic lock guard implementation compiles in all standard
-// dialects, including C++03, even though it is forward declared using
-// variadic templates.
-
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#include "mutex.pass.cpp" // Use the existing non-variadic test

test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp

@@ -8,18 +8,17 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++98, c++03, c++11, c++14
 
 // <mutex>
 
-// template <class ...Mutex> class lock_guard;
+// template <class ...Mutex> class scoped_lock;
 
-// lock_guard(Mutex&..., adopt_lock_t);
+// scoped_lock(Mutex&..., adopt_lock_t);
 
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 #include <mutex>
 #include <cassert>
+#include "test_macros.h"
 
 struct TestMutex {
     bool locked = false;
@@ -36,12 +35,22 @@ struct TestMutex {
 int main()
 {
     {
-        using LG = std::lock_guard<>;
+        using LG = std::scoped_lock<>;
         LG lg(std::adopt_lock);
     }
+    {
+        TestMutex m1;
+        using LG = std::scoped_lock<TestMutex>;
+        m1.lock();
+        {
+            LG lg(m1, std::adopt_lock);
+            assert(m1.locked);
+        }
+        assert(!m1.locked);
+    }
     {
         TestMutex m1, m2;
-        using LG = std::lock_guard<TestMutex, TestMutex>;
+        using LG = std::scoped_lock<TestMutex, TestMutex>;
         m1.lock(); m2.lock();
         {
             LG lg(m1, m2, std::adopt_lock);
@@ -51,7 +60,7 @@ int main()
     }
     {
         TestMutex m1, m2, m3;
-        using LG = std::lock_guard<TestMutex, TestMutex, TestMutex>;
+        using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
         m1.lock(); m2.lock(); m3.lock();
         {
             LG lg(m1, m2, m3, std::adopt_lock);

test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/assign.fail.cpp

@@ -8,17 +8,16 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: libcpp-has-no-threads
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++98, c++03, c++11, c++14
 
 // <mutex>
 
-// template <class ...Mutex> class lock_guard;
+// template <class ...Mutex> class scoped_lock;
 
-// lock_guard& operator=(lock_guard const&) = delete;
+// scoped_lock& operator=(scoped_lock const&) = delete;
 
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 #include <mutex>
+#include "test_macros.h"
 
 int main()
 {
@@ -26,18 +25,24 @@ int main()
     M m0, m1, m2;
     M om0, om1, om2;
     {
-        using LG = std::lock_guard<>;
+        using LG = std::scoped_lock<>;
         LG lg1, lg2;
         lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
     }
     {
-        using LG = std::lock_guard<M, M>;
+        using LG = std::scoped_lock<M>;
+        LG lg1(m0);
+        LG lg2(om0);
+        lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
+    }
+    {
+        using LG = std::scoped_lock<M, M>;
         LG lg1(m0, m1);
         LG lg2(om0, om1);
         lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
     }
     {
-        using LG = std::lock_guard<M, M, M>;
+        using LG = std::scoped_lock<M, M, M>;
         LG lg1(m0, m1, m2);
         LG lg2(om0, om1, om2);
         lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}

test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/copy.fail.cpp

@@ -8,34 +8,38 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: libcpp-has-no-threads
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++98, c++03, c++11, c++14
 
 // <mutex>
 
-// template <class ...Mutex> class lock_guard;
+// template <class ...Mutex> class scoped_lock;
 
-// lock_guard(lock_guard const&) = delete;
+// scoped_lock(scoped_lock const&) = delete;
 
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 #include <mutex>
+#include "test_macros.h"
 
 int main()
 {
     using M = std::mutex;
     M m0, m1, m2;
     {
-        using LG = std::lock_guard<>;
+        using LG = std::scoped_lock<>;
         const LG Orig;
         LG Copy(Orig); // expected-error{{call to deleted constructor of 'LG'}}
     }
     {
-        using LG = std::lock_guard<M, M>;
+        using LG = std::scoped_lock<M>;
+        const LG Orig(m0);
+        LG Copy(Orig); // expected-error{{call to deleted constructor of 'LG'}}
+    }
+    {
+        using LG = std::scoped_lock<M, M>;
         const LG Orig(m0, m1);
         LG Copy(Orig); // expected-error{{call to deleted constructor of 'LG'}}
     }
     {
-        using LG = std::lock_guard<M, M, M>;
+        using LG = std::scoped_lock<M, M, M>;
         const LG Orig(m0, m1, m2);
         LG Copy(Orig); // expected-error{{call to deleted constructor of 'LG'}}
     }

test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.fail.cpp

@@ -8,17 +8,16 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: libcpp-has-no-threads
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++98, c++03, c++11, c++14
 
 // <mutex>
 
-// template <class ...Mutex> class lock_guard;
+// template <class ...Mutex> class scoped_lock;
 
-// explicit lock_guard(Mutex&...);
+// explicit scoped_lock(Mutex&...);
 
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 #include <mutex>
+#include "test_macros.h"
 
 template <class LG>
 void test_conversion(LG) {}
@@ -29,19 +28,25 @@ int main()
     M m0, m1, m2;
     M n0, n1, n2;
     {
-        using LG = std::lock_guard<>;
+        using LG = std::scoped_lock<>;
         LG lg = {}; // expected-error{{chosen constructor is explicit in copy-initialization}}
         test_conversion<LG>({}); // expected-error{{no matching function for call}}
         ((void)lg);
     }
     {
-        using LG = std::lock_guard<M, M>;
+        using LG = std::scoped_lock<M>;
+        LG lg = {m0}; // expected-error{{chosen constructor is explicit in copy-initialization}}
+        test_conversion<LG>({n0}); // expected-error{{no matching function for call}}
+        ((void)lg);
+    }
+    {
+        using LG = std::scoped_lock<M, M>;
         LG lg = {m0, m1}; // expected-error{{chosen constructor is explicit in copy-initialization}}
         test_conversion<LG>({n0, n1}); // expected-error{{no matching function for call}}
         ((void)lg);
     }
     {
-        using LG = std::lock_guard<M, M, M>;
+        using LG = std::scoped_lock<M, M, M>;
         LG lg = {m0, m1, m2}; // expected-error{{chosen constructor is explicit in copy-initialization}}
         test_conversion<LG>({n0, n1, n2}); // expected-error{{no matching function for call}}
     }

test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.pass.cpp

@@ -8,19 +8,16 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++98, c++03, c++11, c++14
 
 // <mutex>
 
-// template <class ...Mutex> class lock_guard;
+// template <class ...Mutex> class scoped_lock;
 
-// explicit lock_guard(mutex_type& m);
+// explicit scoped_lock(mutex_type& m);
 
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 #include <mutex>
 #include <cassert>
-
 #include "test_macros.h"
 
 struct TestMutex {
@@ -68,11 +65,20 @@ struct TestMutexThrows {
 int main()
 {
     {
-        using LG = std::lock_guard<>;
+        using LG = std::scoped_lock<>;
         LG lg;
     }
     {
-        using LG = std::lock_guard<TestMutex, TestMutex>;
+        using LG = std::scoped_lock<TestMutex>;
+        TestMutex m1;
+        {
+            LG lg(m1);
+            assert(m1.locked);
+        }
+        assert(!m1.locked);
+    }
+    {
+        using LG = std::scoped_lock<TestMutex, TestMutex>;
         TestMutex m1, m2;
         {
             LG lg(m1, m2);
@@ -81,7 +87,7 @@ int main()
         assert(!m1.locked && !m2.locked);
     }
     {
-        using LG = std::lock_guard<TestMutex, TestMutex, TestMutex>;
+        using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
         TestMutex m1, m2, m3;
         {
             LG lg(m1, m2, m3);
@@ -92,7 +98,18 @@ int main()
 #if !defined(TEST_HAS_NO_EXCEPTIONS)
     {
         using MT = TestMutexThrows;
-        using LG = std::lock_guard<MT, MT>;
+        using LG = std::scoped_lock<MT>;
+        MT m1;
+        m1.throws_on_lock = true;
+        try {
+            LG lg(m1);
+            assert(false);
+        } catch (int) {}
+        assert(!m1.locked);
+    }
+    {
+        using MT = TestMutexThrows;
+        using LG = std::scoped_lock<MT, MT>;
         MT m1, m2;
         m1.throws_on_lock = true;
         try {
@@ -103,7 +120,7 @@ int main()
     }
     {
         using MT = TestMutexThrows;
-        using LG = std::lock_guard<MT, MT, MT>;
+        using LG = std::scoped_lock<MT, MT, MT>;
         MT m1, m2, m3;
         m2.throws_on_lock = true;
         try {
@@ -113,4 +130,26 @@ int main()
         assert(!m1.locked && !m2.locked && !m3.locked);
     }
 #endif
+
+#ifdef __cpp_deduction_guides
+    {
+    TestMutex m1, m2, m3;
+        {
+        std::scoped_lock sl{};
+        static_assert((std::is_same<decltype(sl), std::scoped_lock<>>::value), "" );
+        }
+        {
+        std::scoped_lock sl{m1};
+        static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1)>>::value), "" );
+        }
+        {
+        std::scoped_lock sl{m1, m2};
+        static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2)>>::value), "" );
+        }
+        {
+        std::scoped_lock sl{m1, m2, m3};
+        static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2), decltype(m3)>>::value), "" );
+        }
+    } 
+#endif
 }

test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/types.pass.cpp

@@ -8,22 +8,21 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++98, c++03, c++11, c++14
 
 // <mutex>
 
-// template <class Mutex>
+// template <class Mutex...>
-// class lock_guard
+// class scoped_lock
 // {
 // public:
-//     typedef Mutex mutex_type;
+//     typedef Mutex mutex_type;  // only if sizeof...(Mutex) == 1
 //     ...
 // };
 
-// MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
-#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
 #include <mutex>
 #include <type_traits>
+#include "test_macros.h"
 
 struct NAT {};
 
@@ -41,39 +40,39 @@ constexpr bool has_mutex_type() {
 int main()
 {
     {
-        using T = std::lock_guard<>;
+        using T = std::scoped_lock<>;
         static_assert(!has_mutex_type<T>(), "");
     }
     {
         using M1 = std::mutex;
-        using T = std::lock_guard<M1>;
+        using T = std::scoped_lock<M1>;
         static_assert(std::is_same<T::mutex_type, M1>::value, "");
     }
     {
         using M1 = std::recursive_mutex;
-        using T = std::lock_guard<M1>;
+        using T = std::scoped_lock<M1>;
         static_assert(std::is_same<T::mutex_type, M1>::value, "");
     }
     {
         using M1 = std::mutex;
         using M2 = std::recursive_mutex;
-        using T = std::lock_guard<M1, M2>;
+        using T = std::scoped_lock<M1, M2>;
         static_assert(!has_mutex_type<T>(), "");
     }
     {
         using M1 = std::mutex;
         using M2 = std::recursive_mutex;
-        using T = std::lock_guard<M1, M1, M2>;
+        using T = std::scoped_lock<M1, M1, M2>;
         static_assert(!has_mutex_type<T>(), "");
     }
     {
         using M1 = std::mutex;
-        using T = std::lock_guard<M1, M1>;
+        using T = std::scoped_lock<M1, M1>;
         static_assert(!has_mutex_type<T>(), "");
     }
     {
         using M1 = std::recursive_mutex;
-        using T = std::lock_guard<M1, M1, M1>;
+        using T = std::scoped_lock<M1, M1, M1>;
         static_assert(!has_mutex_type<T>(), "");
     }
 }

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp

@@ -18,6 +18,9 @@
 
 // explicit shared_lock(mutex_type& m);
 
+// template<class _Mutex> shared_lock(shared_lock<_Mutex>)
+//     -> shared_lock<_Mutex>;  // C++17
+
 #include <shared_mutex>
 #include <thread>
 #include <vector>
@@ -92,4 +95,9 @@ int main()
             t.join();
         q.join();
     }
+
+#ifdef __cpp_deduction_guides
+    std::shared_lock sl(m);
+    static_assert((std::is_same<decltype(sl), std::shared_lock<decltype(m)>>::value), "" );
+#endif
 }

test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp

@@ -15,11 +15,16 @@
 
 // explicit unique_lock(mutex_type& m);
 
+// template<class _Mutex> unique_lock(unique_lock<_Mutex>)
+//     -> unique_lock<_Mutex>;  // C++17
+
 #include <mutex>
 #include <thread>
 #include <cstdlib>
 #include <cassert>
 
+#include "test_macros.h"
+
 std::mutex m;
 
 typedef std::chrono::system_clock Clock;
@@ -47,4 +52,9 @@ int main()
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+#ifdef __cpp_deduction_guides
+	std::unique_lock ul(m);
+    static_assert((std::is_same<decltype(ul), std::unique_lock<decltype(m)>>::value), "" );
+#endif
 }

www/cxx1z_status.html

@@ -75,7 +75,7 @@
 	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0006r0.html">P0006R0</a></td><td>LWG</td><td>Adopt Type Traits Variable Templates for C++17.</td><td>Kona</td><td>Complete</td><td>3.8</td></tr>
 	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/P0092R1.html">P0092R1</a></td><td>LWG</td><td>Polishing &lt;chrono&gt;</td><td>Kona</td><td>Complete</td><td>3.8</td></tr>
 	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/P0007R1.html">P0007R1</a></td><td>LWG</td><td>Constant View: A proposal for a <tt>std::as_const</tt> helper function template.</td><td>Kona</td><td>Complete</td><td>3.8</td></tr>
-	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0156r0.html" >P0156R0</a></td><td>LWG</td><td>Variadic lock_guard(rev 3).</td><td>Kona</td><td>Complete (ABI V2 Only)</td><td>3.9</td></tr>
+	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0156r0.html" >P0156R0</a></td><td>LWG</td><td>Variadic lock_guard(rev 3).</td><td>Kona</td><td><I>Reverted in Kona</I></td><td>3.9</td></tr>
 	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/P0074R0.html">P0074R0</a></td><td>LWG</td><td>Making <tt>std::owner_less</tt> more flexible</td><td>Kona</td><td>Complete</td><td>3.8</td></tr>
 	<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/P0013R1.html">P0013R1</a></td><td>LWG</td><td>Logical type traits rev 2</td><td>Kona</td><td>Complete</td><td>3.8</td></tr>
   	<tr><td></td><td></td><td></td><td></td><td></td><td></td></tr>
@@ -142,7 +142,7 @@
 	<tr><td><a href="http://wg21.link/P0517R0">P0517R0</a></td><td>LWG</td><td>Make future_error Constructible</td><td>Issaquah</td><td>Complete</td><td>4.0</td></tr>
 	<tr><td><a href="http://wg21.link/P0521R0">P0521R0</a></td><td>LWG</td><td>Proposed Resolution for CA 14 (shared_ptr use_count/unique)</td><td>Issaquah</td><td><i>Nothing to do</i></td><td>n/a</td></tr>
   	<tr><td></td><td></td><td></td><td></td><td></td><td></td></tr>
-	<tr><td><a href="http://wg21.link/P0156R2">P0156R2</a></td><td>LWG</td><td>Variadic Lock guard</td><td>Kona</td><td></td><td></td></tr>
+	<tr><td><a href="http://wg21.link/P0156R2">P0156R2</a></td><td>LWG</td><td>Variadic Lock guard(rev 5)</td><td>Kona</td><td>Complete</td><td>5.0</td></tr>
 	<tr><td><a href="http://wg21.link/P0270R3">P0270R3</a></td><td>CWG</td><td>Removing C dependencies from signal handler wording</td><td>Kona</td><td></td><td></td></tr>
 	<tr><td><a href="http://wg21.link/P0298R3">P0298R3</a></td><td>CWG</td><td>A byte type definition</td><td>Kona</td><td></td><td></td></tr>
 	<tr><td><a href="http://wg21.link/P0317R1">P0317R1</a></td><td>LWG</td><td>Directory Entry Caching for Filesystem</td><td>Kona</td><td></td><td></td></tr>
@@ -489,7 +489,7 @@
 <!-- 	<tr><td></td><td></td><td></td><td></td></tr> -->
   </table>
 
-  <p>Last Updated: 6-Mar-2017</p>
+  <p>Last Updated: 23-Mar-2017</p>
 </div>
 </body>
 </html>