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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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___THREAD_ID_H
#define _LIBCPP___THREAD_ID_H
#include <__compare/ordering.h>
#include <__config>
#include <__fwd/hash.h>
#include <__threading_support>
#include <iosfwd>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_HAS_NO_THREADS
class _LIBCPP_EXPORTED_FROM_ABI __thread_id;
namespace this_thread {
_LIBCPP_HIDE_FROM_ABI __thread_id get_id() _NOEXCEPT;
} // namespace this_thread
template <>
struct hash<__thread_id>;
class _LIBCPP_TEMPLATE_VIS __thread_id {
// FIXME: pthread_t is a pointer on Darwin but a long on Linux.
// NULL is the no-thread value on Darwin. Someone needs to check
// on other platforms. We assume 0 works everywhere for now.
__libcpp_thread_id __id_;
static _LIBCPP_HIDE_FROM_ABI bool
__lt_impl(__thread_id __x, __thread_id __y) _NOEXCEPT { // id==0 is always less than any other thread_id
if (__x.__id_ == 0)
return __y.__id_ != 0;
if (__y.__id_ == 0)
return false;
return __libcpp_thread_id_less(__x.__id_, __y.__id_);
}
public:
_LIBCPP_HIDE_FROM_ABI __thread_id() _NOEXCEPT : __id_(0) {}
_LIBCPP_HIDE_FROM_ABI void __reset() { __id_ = 0; }
friend _LIBCPP_HIDE_FROM_ABI bool operator==(__thread_id __x, __thread_id __y) _NOEXCEPT;
# if _LIBCPP_STD_VER <= 17
friend _LIBCPP_HIDE_FROM_ABI bool operator<(__thread_id __x, __thread_id __y) _NOEXCEPT;
# else // _LIBCPP_STD_VER <= 17
friend _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(__thread_id __x, __thread_id __y) noexcept;
# endif // _LIBCPP_STD_VER <= 17
template <class _CharT, class _Traits>
friend _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id);
private:
_LIBCPP_HIDE_FROM_ABI __thread_id(__libcpp_thread_id __id) : __id_(__id) {}
_LIBCPP_HIDE_FROM_ABI friend __libcpp_thread_id __get_underlying_id(const __thread_id __id) { return __id.__id_; }
friend __thread_id this_thread::get_id() _NOEXCEPT;
friend class _LIBCPP_EXPORTED_FROM_ABI thread;
friend struct _LIBCPP_TEMPLATE_VIS hash<__thread_id>;
};
inline _LIBCPP_HIDE_FROM_ABI bool operator==(__thread_id __x, __thread_id __y) _NOEXCEPT {
// Don't pass id==0 to underlying routines
if (__x.__id_ == 0)
return __y.__id_ == 0;
if (__y.__id_ == 0)
return false;
return __libcpp_thread_id_equal(__x.__id_, __y.__id_);
}
# if _LIBCPP_STD_VER <= 17
inline _LIBCPP_HIDE_FROM_ABI bool operator!=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__x == __y); }
inline _LIBCPP_HIDE_FROM_ABI bool operator<(__thread_id __x, __thread_id __y) _NOEXCEPT {
return __thread_id::__lt_impl(__x.__id_, __y.__id_);
}
inline _LIBCPP_HIDE_FROM_ABI bool operator<=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__y < __x); }
inline _LIBCPP_HIDE_FROM_ABI bool operator>(__thread_id __x, __thread_id __y) _NOEXCEPT { return __y < __x; }
inline _LIBCPP_HIDE_FROM_ABI bool operator>=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__x < __y); }
# else // _LIBCPP_STD_VER <= 17
inline _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(__thread_id __x, __thread_id __y) noexcept {
if (__x == __y)
return strong_ordering::equal;
if (__thread_id::__lt_impl(__x, __y))
return strong_ordering::less;
return strong_ordering::greater;
}
# endif // _LIBCPP_STD_VER <= 17
namespace this_thread {
inline _LIBCPP_HIDE_FROM_ABI __thread_id get_id() _NOEXCEPT { return __libcpp_thread_get_current_id(); }
} // namespace this_thread
#endif // !_LIBCPP_HAS_NO_THREADS
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___THREAD_ID_H
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