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98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
// mutex -*- C++ -*-
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// Copyright (C) 2008-2018 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 <mutex>
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#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
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#ifndef _GLIBCXX_HAVE_TLS
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namespace
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{
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inline std::unique_lock<std::mutex>*&
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__get_once_functor_lock_ptr()
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{
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static std::unique_lock<std::mutex>* __once_functor_lock_ptr = 0;
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return __once_functor_lock_ptr;
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}
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}
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#endif
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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 _GLIBCXX_HAVE_TLS
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__thread void* __once_callable;
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__thread void (*__once_call)();
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#else
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// Explicit instantiation due to -fno-implicit-instantiation.
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template class function<void()>;
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function<void()> __once_functor;
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mutex&
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__get_once_mutex()
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{
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static mutex once_mutex;
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return once_mutex;
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}
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// code linked against ABI 3.4.12 and later uses this
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void
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__set_once_functor_lock_ptr(unique_lock<mutex>* __ptr)
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{
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__get_once_functor_lock_ptr() = __ptr;
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}
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// unsafe - retained for compatibility with ABI 3.4.11
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unique_lock<mutex>&
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__get_once_functor_lock()
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{
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static unique_lock<mutex> once_functor_lock(__get_once_mutex(), defer_lock);
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return once_functor_lock;
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}
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#endif
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extern "C"
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{
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void __once_proxy()
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{
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#ifndef _GLIBCXX_HAVE_TLS
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function<void()> __once_call = std::move(__once_functor);
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if (unique_lock<mutex>* __lock = __get_once_functor_lock_ptr())
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{
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// caller is using new ABI and provided lock ptr
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__get_once_functor_lock_ptr() = 0;
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__lock->unlock();
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}
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else
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__get_once_functor_lock().unlock(); // global lock
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#endif
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__once_call();
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}
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
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