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89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
// Support for pointer abstractions -*- C++ -*-
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// Copyright (C) 2011-2018 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <memory>
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namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
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{
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const unsigned char mask = 0xf;
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const unsigned char invalid = mask + 1;
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/* Returns different instances of __mutex depending on the passed index
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* in order to limit contention.
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*/
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__gnu_cxx::__mutex& get_mutex(unsigned char i);
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}
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#ifdef __GTHREADS
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namespace
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{
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inline unsigned char key(const void* addr)
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{ return _Hash_impl::hash(addr) & __gnu_internal::mask; }
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}
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_Sp_locker::_Sp_locker(const void* p) noexcept
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{
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if (__gthread_active_p())
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{
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_M_key1 = _M_key2 = key(p);
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__gnu_internal::get_mutex(_M_key1).lock();
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}
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else
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_M_key1 = _M_key2 = __gnu_internal::invalid;
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}
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_Sp_locker::_Sp_locker(const void* p1, const void* p2) noexcept
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{
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if (__gthread_active_p())
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{
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_M_key1 = key(p1);
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_M_key2 = key(p2);
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if (_M_key2 < _M_key1)
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__gnu_internal::get_mutex(_M_key2).lock();
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__gnu_internal::get_mutex(_M_key1).lock();
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if (_M_key2 > _M_key1)
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__gnu_internal::get_mutex(_M_key2).lock();
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}
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else
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_M_key1 = _M_key2 = __gnu_internal::invalid;
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}
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_Sp_locker::~_Sp_locker()
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{
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if (_M_key1 != __gnu_internal::invalid)
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{
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__gnu_internal::get_mutex(_M_key1).unlock();
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if (_M_key2 != _M_key1)
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__gnu_internal::get_mutex(_M_key2).unlock();
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}
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}
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#endif
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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