32 lines
749 B
C++
32 lines
749 B
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// <mutex>
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// template <class Mutex> class unique_lock;
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// mutex_type *mutex() const;
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#include <mutex>
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#include <cassert>
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std::mutex m;
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int main()
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{
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std::unique_lock<std::mutex> lk0;
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assert(lk0.mutex() == nullptr);
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std::unique_lock<std::mutex> lk1(m);
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assert(lk1.mutex() == &m);
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lk1.unlock();
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assert(lk1.mutex() == &m);
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}
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