1 // Low-level functions for atomic operations: PA-RISC version -*- C++ -*-
3 // Copyright (C) 2002, 2004 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 2, 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 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
30 #include <bits/atomicity.h>
35 struct __Atomicity_lock
37 static volatile int _S_atomicity_lock;
42 __Atomicity_lock<__inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1;
44 /* Because of the lack of weak support when using the hpux
45 som linker, we explicitly instantiate the atomicity lock
46 in src/misc-inst.cc when _GLIBCXX_INST_ATOMICITY_LOCK
48 #ifndef _GLIBCXX_INST_ATOMICITY_LOCK
49 template volatile int __Atomicity_lock<0>::_S_atomicity_lock;
53 __attribute__ ((__unused__))
54 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
58 volatile int& lock = __Atomicity_lock<0>::_S_atomicity_lock;
60 __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
61 "cmpib,<>,n 0,%0,.+20\n\t"
63 "cmpib,= 0,%0,.-4\n\t"
70 *__mem = result + __val;
71 /* Reset lock with PA 2.0 "ordered" store. */
72 __asm__ __volatile__ ("stw,ma %1,0(%0)"
73 : : "r" (&lock), "r" (tmp) : "memory");
78 __attribute__ ((__unused__))
79 __atomic_add(_Atomic_word* __mem, int __val)
82 volatile int& lock = __Atomicity_lock<0>::_S_atomicity_lock;
84 __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
85 "cmpib,<>,n 0,%0,.+20\n\t"
87 "cmpib,= 0,%0,.-4\n\t"
94 /* Reset lock with PA 2.0 "ordered" store. */
95 __asm__ __volatile__ ("stw,ma %1,0(%0)"
96 : : "r" (&lock), "r" (tmp) : "memory");
98 } // namespace __gnu_cxx