1 // Low-level functions for atomic operations: Sparc version -*- C++ -*-
3 // Copyright (C) 1999, 2000, 2001, 2002 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 #ifndef _BITS_ATOMICITY_H
31 #define _BITS_ATOMICITY_H 1
35 typedef long _Atomic_word;
37 static inline _Atomic_word
38 __attribute__ ((__unused__))
39 __exchange_and_add (volatile _Atomic_word *__mem, int __val)
41 _Atomic_word __tmp1, __tmp2;
43 __asm__ __volatile__("1: ldx [%2], %0\n\t"
45 " casx [%2], %0, %1\n\t"
49 : "=&r" (__tmp1), "=&r" (__tmp2)
50 : "r" (__mem), "r" (__val)
56 __attribute__ ((__unused__))
57 __atomic_add (volatile _Atomic_word* __mem, int __val)
59 _Atomic_word __tmp1, __tmp2;
61 __asm__ __volatile__("1: ldx [%2], %0\n\t"
63 " casx [%2], %0, %1\n\t"
67 : "=&r" (__tmp1), "=&r" (__tmp2)
68 : "r" (__mem), "r" (__val)
72 #else /* __arch32__ */
74 typedef int _Atomic_word;
77 struct __Atomicity_lock
79 static unsigned char _S_atomicity_lock;
83 unsigned char __Atomicity_lock<__inst>::_S_atomicity_lock = 0;
85 template unsigned char __Atomicity_lock<0>::_S_atomicity_lock;
88 __attribute__ ((__unused__))
89 __exchange_and_add (volatile _Atomic_word* __mem, int __val)
91 _Atomic_word __result, __tmp;
93 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
98 : "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
102 __asm__ __volatile__("stb %%g0, [%0]"
104 : "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
110 __attribute__ ((__unused__))
111 __atomic_add (volatile _Atomic_word* __mem, int __val)
115 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
120 : "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
123 __asm__ __volatile__("stb %%g0, [%0]"
125 : "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
129 #endif /* __arch32__ */
131 #endif /* atomicity.h */