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>
31 lines
789 B
C++
31 lines
789 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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// <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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#include <cassert>
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#include <mutex>
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#include <type_traits>
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#include "types.h"
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int main(int, char**) {
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MyMutex m;
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assert(!m.locked);
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std::lock_guard<MyMutex> lg(m);
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assert(m.locked);
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static_assert(!std::is_convertible<MyMutex, std::lock_guard<MyMutex> >::value, "constructor must be explicit");
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return 0;
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}
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