1*38fd1498Szrj // Implementation file for the -*- C++ -*- dynamic memory management header.
2*38fd1498Szrj
3*38fd1498Szrj // Copyright (C) 1996-2018 Free Software Foundation, Inc.
4*38fd1498Szrj //
5*38fd1498Szrj // This file is part of GCC.
6*38fd1498Szrj //
7*38fd1498Szrj // GCC is free software; you can redistribute it and/or modify
8*38fd1498Szrj // it under the terms of the GNU General Public License as published by
9*38fd1498Szrj // the Free Software Foundation; either version 3, or (at your option)
10*38fd1498Szrj // any later version.
11*38fd1498Szrj //
12*38fd1498Szrj // GCC is distributed in the hope that it will be useful,
13*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of
14*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15*38fd1498Szrj // GNU General Public License for more details.
16*38fd1498Szrj //
17*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional
18*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version
19*38fd1498Szrj // 3.1, as published by the Free Software Foundation.
20*38fd1498Szrj
21*38fd1498Szrj // You should have received a copy of the GNU General Public License and
22*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program;
23*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24*38fd1498Szrj // <http://www.gnu.org/licenses/>.
25*38fd1498Szrj
26*38fd1498Szrj #include "new"
27*38fd1498Szrj #include <bits/atomic_lockfree_defines.h>
28*38fd1498Szrj
29*38fd1498Szrj #if ATOMIC_POINTER_LOCK_FREE < 2
30*38fd1498Szrj #include <ext/concurrence.h>
31*38fd1498Szrj namespace
32*38fd1498Szrj {
33*38fd1498Szrj __gnu_cxx::__mutex mx;
34*38fd1498Szrj }
35*38fd1498Szrj #endif
36*38fd1498Szrj
37*38fd1498Szrj const std::nothrow_t std::nothrow = std::nothrow_t{ };
38*38fd1498Szrj
39*38fd1498Szrj using std::new_handler;
40*38fd1498Szrj namespace
41*38fd1498Szrj {
42*38fd1498Szrj new_handler __new_handler;
43*38fd1498Szrj }
44*38fd1498Szrj
45*38fd1498Szrj new_handler
set_new_handler(new_handler handler)46*38fd1498Szrj std::set_new_handler (new_handler handler) throw()
47*38fd1498Szrj {
48*38fd1498Szrj new_handler prev_handler;
49*38fd1498Szrj #if ATOMIC_POINTER_LOCK_FREE > 1
50*38fd1498Szrj __atomic_exchange (&__new_handler, &handler, &prev_handler,
51*38fd1498Szrj __ATOMIC_ACQ_REL);
52*38fd1498Szrj #else
53*38fd1498Szrj __gnu_cxx::__scoped_lock l(mx);
54*38fd1498Szrj prev_handler = __new_handler;
55*38fd1498Szrj __new_handler = handler;
56*38fd1498Szrj #endif
57*38fd1498Szrj return prev_handler;
58*38fd1498Szrj }
59*38fd1498Szrj
60*38fd1498Szrj new_handler
get_new_handler()61*38fd1498Szrj std::get_new_handler () noexcept
62*38fd1498Szrj {
63*38fd1498Szrj new_handler handler;
64*38fd1498Szrj #if ATOMIC_POINTER_LOCK_FREE > 1
65*38fd1498Szrj __atomic_load (&__new_handler, &handler, __ATOMIC_ACQUIRE);
66*38fd1498Szrj #else
67*38fd1498Szrj __gnu_cxx::__scoped_lock l(mx);
68*38fd1498Szrj handler = __new_handler;
69*38fd1498Szrj #endif
70*38fd1498Szrj return handler;
71*38fd1498Szrj }
72