11debfc3dSmrg // Support for pointer abstractions -*- C++ -*- 21debfc3dSmrg 3*8feb0f0bSmrg // Copyright (C) 2011-2020 Free Software Foundation, Inc. 41debfc3dSmrg // 51debfc3dSmrg // This file is part of the GNU ISO C++ Library. This library is free 61debfc3dSmrg // software; you can redistribute it and/or modify it under the 71debfc3dSmrg // terms of the GNU General Public License as published by the 81debfc3dSmrg // Free Software Foundation; either version 3, or (at your option) 91debfc3dSmrg // any later version. 101debfc3dSmrg 111debfc3dSmrg // This library is distributed in the hope that it will be useful, 121debfc3dSmrg // but WITHOUT ANY WARRANTY; without even the implied warranty of 131debfc3dSmrg // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 141debfc3dSmrg // GNU General Public License for more details. 151debfc3dSmrg 161debfc3dSmrg // Under Section 7 of GPL version 3, you are granted additional 171debfc3dSmrg // permissions described in the GCC Runtime Library Exception, version 181debfc3dSmrg // 3.1, as published by the Free Software Foundation. 191debfc3dSmrg 201debfc3dSmrg // You should have received a copy of the GNU General Public License and 211debfc3dSmrg // a copy of the GCC Runtime Library Exception along with this program; 221debfc3dSmrg // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 231debfc3dSmrg // <http://www.gnu.org/licenses/>. 241debfc3dSmrg 251debfc3dSmrg #include <memory> 261debfc3dSmrg 271debfc3dSmrg #include "mutex_pool.h" 281debfc3dSmrg 291debfc3dSmrg namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden) 301debfc3dSmrg { 311debfc3dSmrg /* Returns different instances of __mutex depending on the passed index 321debfc3dSmrg * in order to limit contention. 331debfc3dSmrg */ 341debfc3dSmrg __gnu_cxx::__mutex& get_mutex(unsigned char i)351debfc3dSmrg get_mutex(unsigned char i) 361debfc3dSmrg { 37*8feb0f0bSmrg // increase alignment to put each lock on a separate cache line 38*8feb0f0bSmrg struct alignas(64) M : __gnu_cxx::__mutex { }; 39*8feb0f0bSmrg static M m[mask + 1]; 401debfc3dSmrg return m[i]; 411debfc3dSmrg } 421debfc3dSmrg } 431debfc3dSmrg 441debfc3dSmrg namespace std _GLIBCXX_VISIBILITY(default) 451debfc3dSmrg { 461debfc3dSmrg _GLIBCXX_BEGIN_NAMESPACE_VERSION 471debfc3dSmrg 481debfc3dSmrg bad_weak_ptr::~bad_weak_ptr() noexcept = default; 491debfc3dSmrg 501debfc3dSmrg char const* what() const511debfc3dSmrg bad_weak_ptr::what() const noexcept 521debfc3dSmrg { return "bad_weak_ptr"; } 531debfc3dSmrg 541debfc3dSmrg #ifdef __GTHREADS 551debfc3dSmrg namespace 561debfc3dSmrg { key(const void * addr)571debfc3dSmrg inline unsigned char key(const void* addr) 581debfc3dSmrg { return _Hash_impl::hash(addr) & __gnu_internal::mask; } 591debfc3dSmrg } 601debfc3dSmrg _Sp_locker(const void * p)611debfc3dSmrg _Sp_locker::_Sp_locker(const void* p) noexcept 621debfc3dSmrg { 631debfc3dSmrg if (__gthread_active_p()) 641debfc3dSmrg { 651debfc3dSmrg _M_key1 = _M_key2 = key(p); 661debfc3dSmrg __gnu_internal::get_mutex(_M_key1).lock(); 671debfc3dSmrg } 681debfc3dSmrg else 691debfc3dSmrg _M_key1 = _M_key2 = __gnu_internal::invalid; 701debfc3dSmrg } 711debfc3dSmrg _Sp_locker(const void * p1,const void * p2)721debfc3dSmrg _Sp_locker::_Sp_locker(const void* p1, const void* p2) noexcept 731debfc3dSmrg { 741debfc3dSmrg if (__gthread_active_p()) 751debfc3dSmrg { 761debfc3dSmrg _M_key1 = key(p1); 771debfc3dSmrg _M_key2 = key(p2); 781debfc3dSmrg if (_M_key2 < _M_key1) 791debfc3dSmrg __gnu_internal::get_mutex(_M_key2).lock(); 801debfc3dSmrg __gnu_internal::get_mutex(_M_key1).lock(); 811debfc3dSmrg if (_M_key2 > _M_key1) 821debfc3dSmrg __gnu_internal::get_mutex(_M_key2).lock(); 831debfc3dSmrg } 841debfc3dSmrg else 851debfc3dSmrg _M_key1 = _M_key2 = __gnu_internal::invalid; 861debfc3dSmrg } 871debfc3dSmrg ~_Sp_locker()881debfc3dSmrg _Sp_locker::~_Sp_locker() 891debfc3dSmrg { 901debfc3dSmrg if (_M_key1 != __gnu_internal::invalid) 911debfc3dSmrg { 921debfc3dSmrg __gnu_internal::get_mutex(_M_key1).unlock(); 931debfc3dSmrg if (_M_key2 != _M_key1) 941debfc3dSmrg __gnu_internal::get_mutex(_M_key2).unlock(); 951debfc3dSmrg } 961debfc3dSmrg } 971debfc3dSmrg #endif 981debfc3dSmrg 99c0a68be4Smrg bool _S_eq(const type_info & ti)100c0a68be4Smrg _Sp_make_shared_tag::_S_eq(const type_info& ti) noexcept 101c0a68be4Smrg { 102c0a68be4Smrg #if __cpp_rtti 103c0a68be4Smrg return ti == typeid(_Sp_make_shared_tag); 104c0a68be4Smrg #else 105c0a68be4Smrg // If libstdc++ itself is built with -fno-rtti then just assume that 106c0a68be4Smrg // make_shared and allocate_shared will never be used with -frtti. 107c0a68be4Smrg return false; 108c0a68be4Smrg #endif 109c0a68be4Smrg } 110c0a68be4Smrg 1111debfc3dSmrg _GLIBCXX_END_NAMESPACE_VERSION 1121debfc3dSmrg } // namespace 113