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458f31b3 | 1 | // Implementation file for the -*- C++ -*- dynamic memory management header. |
85d54afa | 2 | |
f1717362 | 3 | // Copyright (C) 1996-2016 Free Software Foundation, Inc. |
458f31b3 | 4 | // |
908dad4c | 5 | // This file is part of GCC. |
458f31b3 | 6 | // |
908dad4c | 7 | // GCC is free software; you can redistribute it and/or modify |
458f31b3 | 8 | // it under the terms of the GNU General Public License as published by |
6bc9506f | 9 | // the Free Software Foundation; either version 3, or (at your option) |
458f31b3 | 10 | // any later version. |
11 | // | |
908dad4c | 12 | // GCC is distributed in the hope that it will be useful, |
458f31b3 | 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | // | |
6bc9506f | 17 | // Under Section 7 of GPL version 3, you are granted additional |
18 | // permissions described in the GCC Runtime Library Exception, version | |
19 | // 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | // You should have received a copy of the GNU General Public License and | |
22 | // a copy of the GCC Runtime Library Exception along with this program; | |
23 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | // <http://www.gnu.org/licenses/>. | |
458f31b3 | 25 | |
458f31b3 | 26 | #include "new" |
257b4f53 | 27 | #include <bits/atomic_lockfree_defines.h> |
28 | ||
29 | #if ATOMIC_POINTER_LOCK_FREE < 2 | |
30 | #include <ext/concurrence.h> | |
31 | namespace | |
32 | { | |
33 | __gnu_cxx::__mutex mx; | |
34 | } | |
35 | #endif | |
458f31b3 | 36 | |
a3f25f0f | 37 | const std::nothrow_t std::nothrow = std::nothrow_t{ }; |
458f31b3 | 38 | |
39 | using std::new_handler; | |
a366a1d3 | 40 | namespace |
41 | { | |
42 | new_handler __new_handler; | |
43 | } | |
458f31b3 | 44 | |
45 | new_handler | |
067ae9c8 | 46 | std::set_new_handler (new_handler handler) throw() |
458f31b3 | 47 | { |
a366a1d3 | 48 | new_handler prev_handler; |
257b4f53 | 49 | #if ATOMIC_POINTER_LOCK_FREE > 1 |
a366a1d3 | 50 | __atomic_exchange (&__new_handler, &handler, &prev_handler, |
51 | __ATOMIC_ACQ_REL); | |
257b4f53 | 52 | #else |
53 | __gnu_cxx::__scoped_lock l(mx); | |
54 | prev_handler = __new_handler; | |
55 | __new_handler = handler; | |
56 | #endif | |
458f31b3 | 57 | return prev_handler; |
58 | } | |
a366a1d3 | 59 | |
60 | new_handler | |
61 | std::get_new_handler () noexcept | |
62 | { | |
63 | new_handler handler; | |
257b4f53 | 64 | #if ATOMIC_POINTER_LOCK_FREE > 1 |
a366a1d3 | 65 | __atomic_load (&__new_handler, &handler, __ATOMIC_ACQUIRE); |
257b4f53 | 66 | #else |
67 | __gnu_cxx::__scoped_lock l(mx); | |
68 | handler = __new_handler; | |
69 | #endif | |
a366a1d3 | 70 | return handler; |
71 | } |