a675c1dee4
These two tests were clumsily using time measurements to determine whether std::lock_guard was working correctly. In practice, this approach merely verified that the underlying lock properly waits. Now these two tests verify that lock is acquired, not dropped prematurely, and finally, actually dropped at the end of the scope.
45 lines
992 B
C++
45 lines
992 B
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 lock_guard;
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// explicit lock_guard(mutex_type& m);
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// template<class _Mutex> lock_guard(lock_guard<_Mutex>)
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// -> lock_guard<_Mutex>; // C++17
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#include <mutex>
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#include <cstdlib>
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#include <cassert>
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#include "test_macros.h"
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std::mutex m;
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int main()
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{
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{
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std::lock_guard<std::mutex> lg(m);
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assert(m.try_lock() == false);
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}
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m.lock();
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m.unlock();
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#ifdef __cpp_deduction_guides
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std::lock_guard lg(m);
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static_assert((std::is_same<decltype(lg), std::lock_guard<decltype(m)>>::value), "" );
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#endif
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return 0;
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}
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