00001 /* Atomic operations 00002 Copyright (C) 2000 Free Software Foundation, Inc. 00003 Written by Stephane Carrez (stcarrez@worldnet.fr) 00004 00005 This file is free software; you can redistribute it and/or modify it 00006 under the terms of the GNU General Public License as published by the 00007 Free Software Foundation; either version 2, or (at your option) any 00008 later version. 00009 00010 In addition to the permissions in the GNU General Public License, the 00011 Free Software Foundation gives you unlimited permission to link the 00012 compiled version of this file with other programs, and to distribute 00013 those programs without any restriction coming from the use of this 00014 file. (The General Public License restrictions do apply in other 00015 respects; for example, they cover modification of the file, and 00016 distribution when not linked into another program.) 00017 00018 This file is distributed in the hope that it will be useful, but 00019 WITHOUT ANY WARRANTY; without even the implied warranty of 00020 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00021 General Public License for more details. 00022 00023 You should have received a copy of the GNU General Public License 00024 along with this program; see the file COPYING. If not, write to 00025 the Free Software Foundation, 59 Temple Place - Suite 330, 00026 Boston, MA 02111-1307, USA. */ 00027 00028 #ifndef _M68HC11_ATOMIC_H 00029 #define _M68HC11_ATOMIC_H 00030 00075 00076 typedef struct { int counter; } atomic_t; 00077 00078 #define ATOMIC_INIT(i) { (i) } 00079 00080 #define atomic_read(v) ((v)->counter) 00081 #define atomic_set(v,i) (((v)->counter) = (i)) 00082 00083 static __inline__ void 00084 atomic_short_add(short i, volatile atomic_short_t *v) 00085 { 00086 unsigned short mask; 00087 00088 mask = lock (); 00089 v->counter += i; 00090 restore (mask); 00091 } 00092 00093 static __inline__ void 00094 atomic_short_sub(short i, volatile atomic_t *v) 00095 { 00096 unsigned short mask; 00097 00098 mask = lock (); 00099 v->counter -= i; 00100 restore (mask); 00101 } 00102 00105 #endif