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

llvm-svn: 298681

1 files changed, 72 insertions, 0 deletions

diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp
new file mode 100644
index 00000000000..78165383a15
--- /dev/null
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp
@@ -0,0 +1,72 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+
+// <mutex>
+
+// template <class ...Mutex> class scoped_lock;
+
+// scoped_lock(Mutex&..., adopt_lock_t);
+
+#include <mutex>
+#include <cassert>
+#include "test_macros.h"
+
+struct TestMutex {
+    bool locked = false;
+    TestMutex() = default;
+
+    void lock() { assert(!locked); locked = true; }
+    bool try_lock() { if (locked) return false; locked = true; return true; }
+    void unlock() { assert(locked); locked = false; }
+
+    TestMutex(TestMutex const&) = delete;
+    TestMutex& operator=(TestMutex const&) = delete;
+};
+
+int main()
+{
+    {
+        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::scoped_lock<TestMutex, TestMutex>;
+        m1.lock(); m2.lock();
+        {
+            LG lg(m1, m2, std::adopt_lock);
+            assert(m1.locked && m2.locked);
+        }
+        assert(!m1.locked && !m2.locked);
+    }
+    {
+        TestMutex m1, m2, m3;
+        using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
+        m1.lock(); m2.lock(); m3.lock();
+        {
+            LG lg(m1, m2, m3, std::adopt_lock);
+            assert(m1.locked && m2.locked && m3.locked);
+        }
+        assert(!m1.locked && !m2.locked && !m3.locked);
+    }
+
+}