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5d4439cc3e
release/17.x branch, commit 8f4dd44097c9ae25dd203d5ac87f3b48f854bba8 This adds the flag `-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL`. A future enhancement could possibly pass something different if there is a compelling parallel implementation. That libdispatch one might be worth looking into.
51 lines
1.5 KiB
C++
Vendored
51 lines
1.5 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
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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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// Define ~mutex.
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//
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// On some platforms ~mutex has been made trivial and the definition is only
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// provided for ABI compatibility.
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//
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// In order to avoid ODR violations within libc++ itself, we need to ensure
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// that *nothing* sees the non-trivial mutex declaration. For this reason
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// we re-declare the entire class in this file instead of using
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// _LIBCPP_BUILDING_LIBRARY to change the definition in the headers.
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#include <__config>
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#include <__threading_support>
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#if !defined(_LIBCPP_HAS_NO_THREADS)
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# if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
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# define NEEDS_MUTEX_DESTRUCTOR
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# endif
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#ifdef NEEDS_MUTEX_DESTRUCTOR
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class _LIBCPP_EXPORTED_FROM_ABI mutex
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{
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__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
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public:
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_LIBCPP_ALWAYS_INLINE _LIBCPP_INLINE_VISIBILITY
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constexpr mutex() = default;
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mutex(const mutex&) = delete;
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mutex& operator=(const mutex&) = delete;
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~mutex() noexcept;
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};
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mutex::~mutex() noexcept
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{
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__libcpp_mutex_destroy(&__m_);
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}
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#endif // !_LIBCPP_HAS_NO_THREADS
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_LIBCPP_END_NAMESPACE_STD
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