6192f458f4
This change makes `std::lock_guard` available when `_LIBCPP_HAS_NO_THREADS` is set. This class is generic and doesn't require threading support, and is regularly used even in environments where threading isn't available like embedded. fixes #89891 --------- Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
50 lines
1.2 KiB
C++
50 lines
1.2 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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// UNSUPPORTED: no-threads
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// UNSUPPORTED: c++03
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// Test the interoperation of std::lock_guard with std::mutex, since that is such
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// a common use case.
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#include <cassert>
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#include <mutex>
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#include <type_traits>
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#include <functional>
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#include "make_test_thread.h"
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#include "test_macros.h"
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void do_try_lock(std::mutex& m) { assert(m.try_lock() == false); }
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int main(int, char**) {
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{
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std::mutex m;
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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, std::ref(m));
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t.join();
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}
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// This should work because the lock_guard unlocked the mutex when it was destroyed above.
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m.lock();
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m.unlock();
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}
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// Test CTAD
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#if TEST_STD_VER >= 17
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{
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std::mutex m;
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std::lock_guard lg(m);
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static_assert(std::is_same<decltype(lg), std::lock_guard<std::mutex>>::value, "");
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}
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#endif
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return 0;
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}
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