1*38fd1498Szrj // Support for pointer abstractions -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 2011-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj #include <memory> 26*38fd1498Szrj 27*38fd1498Szrj #include "mutex_pool.h" 28*38fd1498Szrj 29*38fd1498Szrj namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden) 30*38fd1498Szrj { 31*38fd1498Szrj /* Returns different instances of __mutex depending on the passed index 32*38fd1498Szrj * in order to limit contention. 33*38fd1498Szrj */ 34*38fd1498Szrj __gnu_cxx::__mutex& get_mutex(unsigned char i)35*38fd1498Szrj get_mutex(unsigned char i) 36*38fd1498Szrj { 37*38fd1498Szrj static __gnu_cxx::__mutex m[mask + 1]; 38*38fd1498Szrj return m[i]; 39*38fd1498Szrj } 40*38fd1498Szrj } 41*38fd1498Szrj 42*38fd1498Szrj namespace std _GLIBCXX_VISIBILITY(default) 43*38fd1498Szrj { 44*38fd1498Szrj _GLIBCXX_BEGIN_NAMESPACE_VERSION 45*38fd1498Szrj 46*38fd1498Szrj bad_weak_ptr::~bad_weak_ptr() noexcept = default; 47*38fd1498Szrj 48*38fd1498Szrj char const* what() const49*38fd1498Szrj bad_weak_ptr::what() const noexcept 50*38fd1498Szrj { return "bad_weak_ptr"; } 51*38fd1498Szrj 52*38fd1498Szrj #ifdef __GTHREADS 53*38fd1498Szrj namespace 54*38fd1498Szrj { key(const void * addr)55*38fd1498Szrj inline unsigned char key(const void* addr) 56*38fd1498Szrj { return _Hash_impl::hash(addr) & __gnu_internal::mask; } 57*38fd1498Szrj } 58*38fd1498Szrj _Sp_locker(const void * p)59*38fd1498Szrj _Sp_locker::_Sp_locker(const void* p) noexcept 60*38fd1498Szrj { 61*38fd1498Szrj if (__gthread_active_p()) 62*38fd1498Szrj { 63*38fd1498Szrj _M_key1 = _M_key2 = key(p); 64*38fd1498Szrj __gnu_internal::get_mutex(_M_key1).lock(); 65*38fd1498Szrj } 66*38fd1498Szrj else 67*38fd1498Szrj _M_key1 = _M_key2 = __gnu_internal::invalid; 68*38fd1498Szrj } 69*38fd1498Szrj _Sp_locker(const void * p1,const void * p2)70*38fd1498Szrj _Sp_locker::_Sp_locker(const void* p1, const void* p2) noexcept 71*38fd1498Szrj { 72*38fd1498Szrj if (__gthread_active_p()) 73*38fd1498Szrj { 74*38fd1498Szrj _M_key1 = key(p1); 75*38fd1498Szrj _M_key2 = key(p2); 76*38fd1498Szrj if (_M_key2 < _M_key1) 77*38fd1498Szrj __gnu_internal::get_mutex(_M_key2).lock(); 78*38fd1498Szrj __gnu_internal::get_mutex(_M_key1).lock(); 79*38fd1498Szrj if (_M_key2 > _M_key1) 80*38fd1498Szrj __gnu_internal::get_mutex(_M_key2).lock(); 81*38fd1498Szrj } 82*38fd1498Szrj else 83*38fd1498Szrj _M_key1 = _M_key2 = __gnu_internal::invalid; 84*38fd1498Szrj } 85*38fd1498Szrj ~_Sp_locker()86*38fd1498Szrj _Sp_locker::~_Sp_locker() 87*38fd1498Szrj { 88*38fd1498Szrj if (_M_key1 != __gnu_internal::invalid) 89*38fd1498Szrj { 90*38fd1498Szrj __gnu_internal::get_mutex(_M_key1).unlock(); 91*38fd1498Szrj if (_M_key2 != _M_key1) 92*38fd1498Szrj __gnu_internal::get_mutex(_M_key2).unlock(); 93*38fd1498Szrj } 94*38fd1498Szrj } 95*38fd1498Szrj #endif 96*38fd1498Szrj 97*38fd1498Szrj _GLIBCXX_END_NAMESPACE_VERSION 98*38fd1498Szrj } // namespace 99