1*404b540aSrobert // Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*-
2*404b540aSrobert
3*404b540aSrobert // Copyright (C) 1999, 2000, 2001, 2004, 2005 Free Software Foundation, Inc.
4*404b540aSrobert //
5*404b540aSrobert // This file is part of the GNU ISO C++ Library. This library is free
6*404b540aSrobert // software; you can redistribute it and/or modify it under the
7*404b540aSrobert // terms of the GNU General Public License as published by the
8*404b540aSrobert // Free Software Foundation; either version 2, or (at your option)
9*404b540aSrobert // any later version.
10*404b540aSrobert
11*404b540aSrobert // This library is distributed in the hope that it will be useful,
12*404b540aSrobert // but WITHOUT ANY WARRANTY; without even the implied warranty of
13*404b540aSrobert // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*404b540aSrobert // GNU General Public License for more details.
15*404b540aSrobert
16*404b540aSrobert // You should have received a copy of the GNU General Public License along
17*404b540aSrobert // with this library; see the file COPYING. If not, write to the Free
18*404b540aSrobert // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19*404b540aSrobert // USA.
20*404b540aSrobert
21*404b540aSrobert // As a special exception, you may use this file as part of a free software
22*404b540aSrobert // library without restriction. Specifically, if other files instantiate
23*404b540aSrobert // templates or use macros or inline functions from this file, or you compile
24*404b540aSrobert // this file and link it with other files to produce an executable, this
25*404b540aSrobert // file does not by itself cause the resulting executable to be covered by
26*404b540aSrobert // the GNU General Public License. This exception does not however
27*404b540aSrobert // invalidate any other reasons why the executable file might be covered by
28*404b540aSrobert // the GNU General Public License.
29*404b540aSrobert
30*404b540aSrobert #include <ext/atomicity.h>
31*404b540aSrobert
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)32*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
33*404b540aSrobert
34*404b540aSrobert _Atomic_word
35*404b540aSrobert __attribute__ ((__unused__))
36*404b540aSrobert __exchange_and_add(volatile _Atomic_word* __mem, int __val)
37*404b540aSrobert {
38*404b540aSrobert register _Atomic_word __result;
39*404b540aSrobert __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}"
40*404b540aSrobert : "=r" (__result), "=m" (*__mem)
41*404b540aSrobert : "0" (__val), "m" (*__mem));
42*404b540aSrobert return __result;
43*404b540aSrobert }
44*404b540aSrobert
45*404b540aSrobert void
46*404b540aSrobert __attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word * __mem,int __val)47*404b540aSrobert __atomic_add(volatile _Atomic_word* __mem, int __val)
48*404b540aSrobert {
49*404b540aSrobert __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"
50*404b540aSrobert : "=m" (*__mem) : "ir" (__val), "m" (*__mem));
51*404b540aSrobert }
52*404b540aSrobert
53*404b540aSrobert _GLIBCXX_END_NAMESPACE
54*404b540aSrobert
55