72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// Implementation file for the -*- C++ -*- dynamic memory management header.
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// Copyright (C) 1996-2020 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC 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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//
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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 "new"
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#include <bits/atomic_lockfree_defines.h>
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#if ATOMIC_POINTER_LOCK_FREE < 2
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#include <ext/concurrence.h>
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namespace
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{
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__gnu_cxx::__mutex mx;
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}
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#endif
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const std::nothrow_t std::nothrow = std::nothrow_t{ };
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using std::new_handler;
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namespace
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{
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new_handler __new_handler;
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}
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new_handler
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std::set_new_handler (new_handler handler) throw()
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{
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new_handler prev_handler;
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#if ATOMIC_POINTER_LOCK_FREE > 1
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__atomic_exchange (&__new_handler, &handler, &prev_handler,
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__ATOMIC_ACQ_REL);
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#else
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__gnu_cxx::__scoped_lock l(mx);
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prev_handler = __new_handler;
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__new_handler = handler;
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#endif
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return prev_handler;
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}
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new_handler
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std::get_new_handler () noexcept
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{
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new_handler handler;
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#if ATOMIC_POINTER_LOCK_FREE > 1
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__atomic_load (&__new_handler, &handler, __ATOMIC_ACQUIRE);
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#else
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__gnu_cxx::__scoped_lock l(mx);
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handler = __new_handler;
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#endif
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return handler;
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}
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