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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MUTEX_MUTEX_H
#define _LIBCPP___MUTEX_MUTEX_H
#include <__config>
#include <__thread/support.h>
#include <__type_traits/is_nothrow_constructible.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#ifndef _LIBCPP_HAS_NO_THREADS
_LIBCPP_BEGIN_NAMESPACE_STD
class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex {
__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR mutex() = default;
mutex(const mutex&) = delete;
mutex& operator=(const mutex&) = delete;
# if defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
_LIBCPP_HIDE_FROM_ABI ~mutex() = default;
# else
~mutex() _NOEXCEPT;
# endif
void lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability());
bool try_lock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(try_acquire_capability(true));
void unlock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability());
typedef __libcpp_mutex_t* native_handle_type;
_LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() { return &__m_; }
};
static_assert(is_nothrow_default_constructible<mutex>::value, "the default constructor for std::mutex must be nothrow");
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_HAS_NO_THREADS
#endif // _LIBCPP___MUTEX_MUTEX_H
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