root / lab4 / .minix-src / include / x86 / mutex.h @ 13
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| 1 | 13 | up20180614 | /* $NetBSD: mutex.h,v 1.6 2009/04/24 17:49:51 ad Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 2002, 2006, 2009 The NetBSD Foundation, Inc.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to The NetBSD Foundation
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| 8 | * by Jason R. Thorpe and Andrew Doran.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 29 | * POSSIBILITY OF SUCH DAMAGE.
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| 30 | */
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| 31 | |||
| 32 | #ifndef _X86_MUTEX_H_
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| 33 | #define _X86_MUTEX_H_
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| 34 | |||
| 35 | struct kmutex {
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| 36 | union {
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| 37 | volatile uintptr_t mtxa_owner;
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| 38 | #ifdef __MUTEX_PRIVATE
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| 39 | struct {
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| 40 | volatile uint8_t mtxs_dummy;
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| 41 | ipl_cookie_t mtxs_ipl; |
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| 42 | __cpu_simple_lock_t mtxs_lock; |
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| 43 | volatile uint8_t mtxs_unused;
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| 44 | } s; |
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| 45 | #endif
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| 46 | } u; |
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| 47 | }; |
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| 48 | |||
| 49 | #ifdef __MUTEX_PRIVATE
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| 50 | |||
| 51 | #define mtx_owner u.mtxa_owner
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| 52 | #define mtx_ipl u.s.mtxs_ipl
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| 53 | #define mtx_lock u.s.mtxs_lock
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| 54 | |||
| 55 | #define __HAVE_MUTEX_STUBS 1 |
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| 56 | #define __HAVE_SPIN_MUTEX_STUBS 1 |
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| 57 | #define __HAVE_SIMPLE_MUTEXES 1 |
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| 58 | |||
| 59 | /*
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| 60 | * MUTEX_RECEIVE: technically, no memory barrier is required
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| 61 | * as 'ret' implies a load fence. However we need this to
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| 62 | * handle a bug with some Opteron revisions. See patch.c,
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| 63 | * lock_stubs.S.
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| 64 | */
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| 65 | #define MUTEX_RECEIVE(mtx) membar_consumer()
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| 66 | |||
| 67 | /*
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| 68 | * MUTEX_GIVE: no memory barrier required, as _lock_cas() will take care of it.
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| 69 | */
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| 70 | #define MUTEX_GIVE(mtx) /* nothing */ |
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| 71 | |||
| 72 | #define MUTEX_CAS(p, o, n) \
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| 73 | (_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o)) |
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| 74 | |||
| 75 | unsigned long _atomic_cas_ulong(volatile unsigned long *, |
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| 76 | unsigned long, unsigned long); |
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| 77 | |||
| 78 | #endif /* __MUTEX_PRIVATE */ |
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| 79 | |||
| 80 | #endif /* _X86_MUTEX_H_ */ |