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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.
54 lines
1.5 KiB
C++
Vendored
54 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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#ifndef _LIBCPP___MUTEX_LOCK_GUARD_H
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#define _LIBCPP___MUTEX_LOCK_GUARD_H
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#include <__config>
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#include <__mutex/tag_types.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#ifndef _LIBCPP_HAS_NO_THREADS
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Mutex>
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class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable) lock_guard {
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public:
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typedef _Mutex mutex_type;
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private:
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mutex_type& __m_;
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public:
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI explicit lock_guard(mutex_type& __m)
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_LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
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: __m_(__m) {
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__m_.lock();
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}
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI lock_guard(mutex_type& __m, adopt_lock_t)
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_LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
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: __m_(__m) {}
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_LIBCPP_HIDE_FROM_ABI ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) { __m_.unlock(); }
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private:
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lock_guard(lock_guard const&) = delete;
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lock_guard& operator=(lock_guard const&) = delete;
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};
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_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(lock_guard);
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_HAS_NO_THREADS
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#endif // _LIBCPP___MUTEX_LOCK_GUARD_H
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