rtai-core/include/asm-mips/rtai_atomic.h

00001 /*
00002  * Copyright (C) 2003 Philippe Gerum <rpm@xenomai.org>.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License as
00006  * published by the Free Software Foundation; either version 2 of the
00007  * License, or (at your option) any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  * GNU General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017  */
00018 
00019 #ifndef _RTAI_ASM_MIPS_ATOMIC_H
00020 #define _RTAI_ASM_MIPS_ATOMIC_H
00021 
00022 #ifdef __KERNEL__
00023 
00024 #include <linux/bitops.h>
00025 #include <asm/system.h>
00026 
00027 #define atomic_xchg(ptr,v)      xchg(ptr,v)
00028 
00029 /* Poor man's cmpxchg(). */
00030 #define atomic_cmpxchg(p, o, n) ({      \
00031         typeof(*(p)) __o = (o);         \
00032         typeof(*(p)) __n = (n);         \
00033         typeof(*(p)) __prev;            \
00034         unsigned long flags;            \
00035         hard_save_flags_and_cli(flags); \
00036         __prev = *(p);                  \
00037         if (__prev == __o)              \
00038                 *(p) = __n;             \
00039         hard_restore_flags(flags);      \
00040         __prev; })
00041 
00042 #endif /* __KERNEL__ */
00043 
00044 #endif /* !_RTAI_ASM_MIPS_ATOMIC_H */

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