mirror of git://gcc.gnu.org/git/gcc.git
72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// Implementation file for the -*- C++ -*- dynamic memory management header.
|
|
|
|
// Copyright (C) 1996-2013 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of GCC.
|
|
//
|
|
// GCC is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 3, or (at your option)
|
|
// any later version.
|
|
//
|
|
// GCC is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
#include "new"
|
|
#include <bits/atomic_lockfree_defines.h>
|
|
|
|
#if ATOMIC_POINTER_LOCK_FREE < 2
|
|
#include <ext/concurrence.h>
|
|
namespace
|
|
{
|
|
__gnu_cxx::__mutex mx;
|
|
}
|
|
#endif
|
|
|
|
const std::nothrow_t std::nothrow = { };
|
|
|
|
using std::new_handler;
|
|
namespace
|
|
{
|
|
new_handler __new_handler;
|
|
}
|
|
|
|
new_handler
|
|
std::set_new_handler (new_handler handler) throw()
|
|
{
|
|
new_handler prev_handler;
|
|
#if ATOMIC_POINTER_LOCK_FREE > 1
|
|
__atomic_exchange (&__new_handler, &handler, &prev_handler,
|
|
__ATOMIC_ACQ_REL);
|
|
#else
|
|
__gnu_cxx::__scoped_lock l(mx);
|
|
prev_handler = __new_handler;
|
|
__new_handler = handler;
|
|
#endif
|
|
return prev_handler;
|
|
}
|
|
|
|
new_handler
|
|
std::get_new_handler () noexcept
|
|
{
|
|
new_handler handler;
|
|
#if ATOMIC_POINTER_LOCK_FREE > 1
|
|
__atomic_load (&__new_handler, &handler, __ATOMIC_ACQUIRE);
|
|
#else
|
|
__gnu_cxx::__scoped_lock l(mx);
|
|
handler = __new_handler;
|
|
#endif
|
|
return handler;
|
|
}
|