1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___CXX03___THREAD_ID_H 11 #define _LIBCPP___CXX03___THREAD_ID_H 12 13 #include <__cxx03/__config> 14 #include <__cxx03/__fwd/functional.h> 15 #include <__cxx03/__fwd/ostream.h> 16 #include <__cxx03/__thread/support.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 #ifndef _LIBCPP_HAS_NO_THREADS 25 class _LIBCPP_EXPORTED_FROM_ABI __thread_id; 26 27 namespace this_thread { 28 29 _LIBCPP_HIDE_FROM_ABI __thread_id get_id() _NOEXCEPT; 30 31 } // namespace this_thread 32 33 template <> 34 struct hash<__thread_id>; 35 36 class _LIBCPP_TEMPLATE_VIS __thread_id { 37 // FIXME: pthread_t is a pointer on Darwin but a long on Linux. 38 // NULL is the no-thread value on Darwin. Someone needs to check 39 // on other platforms. We assume 0 works everywhere for now. 40 __libcpp_thread_id __id_; 41 42 static _LIBCPP_HIDE_FROM_ABI bool 43 __lt_impl(__thread_id __x, __thread_id __y) _NOEXCEPT { // id==0 is always less than any other thread_id 44 if (__x.__id_ == 0) 45 return __y.__id_ != 0; 46 if (__y.__id_ == 0) 47 return false; 48 return __libcpp_thread_id_less(__x.__id_, __y.__id_); 49 } 50 51 public: 52 _LIBCPP_HIDE_FROM_ABI __thread_id() _NOEXCEPT : __id_(0) {} 53 54 _LIBCPP_HIDE_FROM_ABI void __reset() { __id_ = 0; } 55 56 friend _LIBCPP_HIDE_FROM_ABI bool operator==(__thread_id __x, __thread_id __y) _NOEXCEPT; 57 friend _LIBCPP_HIDE_FROM_ABI bool operator<(__thread_id __x, __thread_id __y) _NOEXCEPT; 58 59 template <class _CharT, class _Traits> 60 friend _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 61 operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id); 62 63 private: 64 _LIBCPP_HIDE_FROM_ABI __thread_id(__libcpp_thread_id __id) : __id_(__id) {} 65 66 _LIBCPP_HIDE_FROM_ABI friend __libcpp_thread_id __get_underlying_id(const __thread_id __id) { return __id.__id_; } 67 68 friend __thread_id this_thread::get_id() _NOEXCEPT; 69 friend class _LIBCPP_EXPORTED_FROM_ABI thread; 70 friend struct _LIBCPP_TEMPLATE_VIS hash<__thread_id>; 71 }; 72 73 inline _LIBCPP_HIDE_FROM_ABI bool operator==(__thread_id __x, __thread_id __y) _NOEXCEPT { 74 // Don't pass id==0 to underlying routines 75 if (__x.__id_ == 0) 76 return __y.__id_ == 0; 77 if (__y.__id_ == 0) 78 return false; 79 return __libcpp_thread_id_equal(__x.__id_, __y.__id_); 80 } 81 82 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__x == __y); } 83 84 inline _LIBCPP_HIDE_FROM_ABI bool operator<(__thread_id __x, __thread_id __y) _NOEXCEPT { 85 return __thread_id::__lt_impl(__x.__id_, __y.__id_); 86 } 87 88 inline _LIBCPP_HIDE_FROM_ABI bool operator<=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__y < __x); } 89 inline _LIBCPP_HIDE_FROM_ABI bool operator>(__thread_id __x, __thread_id __y) _NOEXCEPT { return __y < __x; } 90 inline _LIBCPP_HIDE_FROM_ABI bool operator>=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__x < __y); } 91 92 namespace this_thread { 93 94 inline _LIBCPP_HIDE_FROM_ABI __thread_id get_id() _NOEXCEPT { return __libcpp_thread_get_current_id(); } 95 96 } // namespace this_thread 97 98 #endif // !_LIBCPP_HAS_NO_THREADS 99 100 _LIBCPP_END_NAMESPACE_STD 101 102 #endif // _LIBCPP___CXX03___THREAD_ID_H 103