diff options
Diffstat (limited to 'sys/arch/mvme88k/include/mplock.h')
| -rw-r--r-- | sys/arch/mvme88k/include/mplock.h | 194 |
1 files changed, 3 insertions, 191 deletions
diff --git a/sys/arch/mvme88k/include/mplock.h b/sys/arch/mvme88k/include/mplock.h index 8f87c895aae..a4e5204c65c 100644 --- a/sys/arch/mvme88k/include/mplock.h +++ b/sys/arch/mvme88k/include/mplock.h @@ -1,191 +1,3 @@ -/* $OpenBSD: mplock.h,v 1.1 2007/11/26 17:15:29 art Exp $ */ - -/* - * Copyright (c) 2004 Niklas Hallqvist. All rights reserved. - * - * 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. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. - */ - -#ifndef _MACHINE_MPLOCK_H_ -#define _MACHINE_MPLOCK_H_ - -/* - * Really simple spinlock implementation with recursive capabilities. - * Correctness is paramount, no fancyness allowed. - */ - -struct __mp_lock { - __cpu_simple_lock_t mpl_lock; - cpuid_t mpl_cpu; - int mpl_count; -}; - -static __inline void -__mp_lock_init(struct __mp_lock *lock) -{ - __cpu_simple_lock_init(&lock->mpl_lock); - lock->mpl_cpu = LK_NOCPU; - lock->mpl_count = 0; -} - -#if defined(MP_LOCKDEBUG) -#ifndef DDB -#error "MP_LOCKDEBUG requires DDB" -#endif - -extern void Debugger(void); -extern int db_printf(const char *, ...) - __attribute__((__format__(__kprintf__,1,2))); - -/* CPU-dependent timing, needs this to be settable from ddb. */ -extern int __mp_lock_spinout; -#endif - -static __inline void -__mp_lock(struct __mp_lock *lock) -{ - int s = spllock(); - - if (lock->mpl_cpu != cpu_number()) { -#ifndef MP_LOCKDEBUG - __cpu_simple_lock(&lock->mpl_lock); -#else - { - int got_it; - do { - int ticks = __mp_lock_spinout; - - do { - got_it = __cpu_simple_lock_try( - &lock->mpl_lock); - } while (!got_it && ticks-- > 0); - if (!got_it) { - db_printf( - "__mp_lock(0x%x): lock spun out", - lock); - Debugger(); - } - } while (!got_it); - } -#endif - lock->mpl_cpu = cpu_number(); - } - lock->mpl_count++; - splx(s); -} - -/* - * Try to acquire the lock, if another cpu has it, fill it in the - * call-by-reference cpu parameter. Return true if acquired. - */ -static __inline int -__mp_lock_try(struct __mp_lock *lock, cpuid_t *cpu) -{ - int s = spllock(); - - if (lock->mpl_cpu != cpu_number()) { - if (!__cpu_simple_lock_try(&lock->mpl_lock)) { - *cpu = lock->mpl_cpu; - splx(s); - return 0; - } - lock->mpl_cpu = cpu_number(); - } - lock->mpl_count++; - splx(s); - return 1; -} - -static __inline void -__mp_unlock(struct __mp_lock *lock) -{ - int s = spllock(); - -#ifdef MP_LOCKDEBUG - if (lock->mpl_count == 0 || lock->mpl_cpu == LK_NOCPU) { - db_printf("__mp_unlock(0x%x): releasing not locked lock\n", - lock); - Debugger(); - } -#endif - - if (--lock->mpl_count == 0) { - lock->mpl_cpu = LK_NOCPU; - __cpu_simple_unlock(&lock->mpl_lock); - } - splx(s); -} - -static __inline int -__mp_release_all(struct __mp_lock *lock) { - int s = spllock(); - int rv = lock->mpl_count; - -#ifdef MP_LOCKDEBUG - if (lock->mpl_count == 0 || lock->mpl_cpu == LK_NOCPU) { - db_printf( - "__mp_release_all(0x%x): releasing not locked lock\n", - lock); - Debugger(); - } -#endif - - lock->mpl_cpu = LK_NOCPU; - lock->mpl_count = 0; - __cpu_simple_unlock(&lock->mpl_lock); - splx(s); - return (rv); -} - -static __inline int -__mp_release_all_but_one(struct __mp_lock *lock) { - int s = spllock(); - int rv = lock->mpl_count - 1; - -#ifdef MP_LOCKDEBUG - if (lock->mpl_count == 0 || lock->mpl_cpu == LK_NOCPU) { - db_printf( - "__mp_release_all_but_one(0x%x): releasing not locked lock\n", - lock); - Debugger(); - } -#endif - - lock->mpl_count = 1; - splx(s); - return (rv); -} - -static __inline void -__mp_acquire_count(struct __mp_lock *lock, int count) { - int s = spllock(); - - while (count--) - __mp_lock(lock); - splx(s); -} - -static __inline int -__mp_lock_held(struct __mp_lock *lock) { - return lock->mpl_count && lock->mpl_cpu == cpu_number(); -} - -#endif /* !_MACHINE_MPLOCK_H */ +/* $OpenBSD: mplock.h,v 1.2 2007/12/02 21:20:17 miod Exp $ */ +/* public domain */ +#include <m88k/mplock.h> |