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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [dl/] [atomicity.h] - Rev 859
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/* Low-level functions for atomic operations. ix86 version, x >= 4. Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _ATOMICITY_H #define _ATOMICITY_H 1 static inline uint32_t __attribute__ ((unused)) exchange_and_add (volatile uint32_t *mem, uint32_t val) { register uint32_t result; __asm__ __volatile__ ("lock; xaddl %0,%1" : "=r" (result), "=m" (*mem) : "m" (val), "1" (*mem)); return result; } static inline void __attribute__ ((unused)) atomic_add (volatile uint32_t *mem, int val) { __asm__ __volatile__ ("lock; addl %1,%0" : "=m" (*mem) : "ir" (val), "m" (*mem)); } static inline char __attribute__ ((unused)) compare_and_swap (volatile long int *p, long int oldval, long int newval) { char ret; long int readval; __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" : "=q" (ret), "=m" (*p), "=a" (readval) : "r" (newval), "1" (*p), "a" (oldval)); return ret; } #endif /* atomicity.h */
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