1 // Low-level functions for atomic operations: PA-RISC version -*- C++ -*-
3 // Copyright (C) 2002, 2004, 2005, 2009 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 #include <bits/c++config.h>
26 #include <ext/atomicity.h>
28 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
31 struct _Atomicity_lock
33 static volatile int _S_atomicity_lock;
38 _Atomicity_lock<_Inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1;
40 // Because of the lack of weak support when using the hpux som
41 // linker, we explicitly instantiate the atomicity lock.
42 template volatile int _Atomicity_lock<0>::_S_atomicity_lock;
45 __attribute__ ((__unused__))
46 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
50 volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock;
52 __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
53 "cmpib,<>,n 0,%0,.+20\n\t"
55 "cmpib,= 0,%0,.-4\n\t"
63 *__mem = result + __val;
64 __asm__ __volatile__ ("stw %1,0(%0)"
65 : : "r" (&lock), "r" (tmp) : "memory");
70 __attribute__ ((__unused__))
71 __atomic_add(volatile _Atomic_word* __mem, int __val)
74 volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock;
76 __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
77 "cmpib,<>,n 0,%0,.+20\n\t"
79 "cmpib,= 0,%0,.-4\n\t"
87 __asm__ __volatile__ ("stw %1,0(%0)"
88 : : "r" (&lock), "r" (tmp) : "memory");
91 _GLIBCXX_END_NAMESPACE