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File: [cvs.NetBSD.org] / src / sys / arch / x86 / include / lock.h (download)
Revision 1.11, Wed Dec 28 19:09:30 2005 UTC (18 years, 3 months ago) by perry
inline -> __inline |
/* $NetBSD: lock.h,v 1.11 2005/12/28 19:09:30 perry Exp $ */ /*- * Copyright (c) 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Machine-dependent spin lock operations. */ #ifndef _X86_LOCK_H_ #define _X86_LOCK_H_ #if defined(_KERNEL_OPT) #include "opt_lockdebug.h" #endif #include <machine/cpufunc.h> #ifdef LOCKDEBUG extern void __cpu_simple_lock_init(__cpu_simple_lock_t *); extern void __cpu_simple_lock(__cpu_simple_lock_t *); extern int __cpu_simple_lock_try(__cpu_simple_lock_t *); extern void __cpu_simple_unlock(__cpu_simple_lock_t *); #else #include <machine/atomic.h> static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *) __attribute__((__unused__)); static __inline void __cpu_simple_lock(__cpu_simple_lock_t *) __attribute__((__unused__)); static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *) __attribute__((__unused__)); static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *) __attribute__((__unused__)); static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *lockp) { *lockp = __SIMPLELOCK_UNLOCKED; __insn_barrier(); } static __inline void __cpu_simple_lock(__cpu_simple_lock_t *lockp) { while (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED) != __SIMPLELOCK_UNLOCKED) { do { x86_pause(); } while (*lockp == __SIMPLELOCK_LOCKED); } __insn_barrier(); } static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *lockp) { int r = (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED) == __SIMPLELOCK_UNLOCKED); __insn_barrier(); return (r); } static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *lockp) { __insn_barrier(); *lockp = __SIMPLELOCK_UNLOCKED; } #endif /* !LOCKDEBUG */ #ifdef _KERNEL #define SPINLOCK_SPIN_HOOK x86_pause() #endif #endif /* _X86_LOCK_H_ */