a7f9895cc1
Since those features are general properties of the environment, it makes sense to use them from libc++abi too, and so the name libcpp-has-no-xxx doesn't make sense. Differential Revision: https://reviews.llvm.org/D126482
50 lines
1.1 KiB
C++
50 lines
1.1 KiB
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: 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 "make_test_thread.h"
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#include "test_macros.h"
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std::mutex m;
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void do_try_lock() {
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assert(m.try_lock() == false);
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}
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int main(int, char**) {
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{
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std::lock_guard<std::mutex> lg(m);
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std::thread t = support::make_test_thread(do_try_lock);
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t.join();
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}
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m.lock();
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m.unlock();
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#if TEST_STD_VER >= 17
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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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