1 // Low-level functions for atomic operations: AIX version -*- C++ -*-
2
3 // Copyright (C) 2000-2017 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 #include <ext/atomicity.h>
26
27 /* We cannot use the cpu/powerpc/bits/atomicity.h inline assembly
28 definitions for these operations since they depend on operations
29 that are not available on the original POWER architecture. AIX
30 still runs on the POWER architecture, so it would be incorrect to
31 assume the existence of these instructions.
32
33 The definition of _Atomic_word must match the type pointed to by
34 atomic_p in <sys/atomic_op.h>. */
35
36 extern "C"
37 {
38 #include <sys/atomic_op.h>
39 }
40
_GLIBCXX_VISIBILITY(default)41 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
42 {
43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
44
45 _Atomic_word
46 __attribute__ ((__unused__))
47 __exchange_and_add (volatile _Atomic_word* __mem, int __val) throw ()
48 { return ::fetch_and_add(const_cast<atomic_p>(__mem), __val); }
49
50 void
51 __attribute__ ((__unused__))
52 __atomic_add (volatile _Atomic_word* __mem, int __val) throw ()
53 { (void) ::fetch_and_add(const_cast<atomic_p>(__mem), __val); }
54
55 _GLIBCXX_END_NAMESPACE_VERSION
56 } // namespace
57