root / lab4 / .minix-src / include / sys / lock.h @ 13
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| 1 | 13 | up20180614 | /* $NetBSD: lock.h,v 1.86 2010/07/01 13:00:57 hannken Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 1999, 2000, 2006, 2007 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 of the Numerical Aerospace Simulation Facility,
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| 9 | * NASA Ames Research Center, by Ross Harvey, and by Andrew Doran.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | *
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| 20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 30 | * POSSIBILITY OF SUCH DAMAGE.
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| 31 | */
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| 32 | |||
| 33 | /*
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| 34 | * Copyright (c) 1995
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| 35 | * The Regents of the University of California. All rights reserved.
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| 36 | *
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| 37 | * This code contains ideas from software contributed to Berkeley by
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| 38 | * Avadis Tevanian, Jr., Michael Wayne Young, and the Mach Operating
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| 39 | * System project at Carnegie-Mellon University.
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| 40 | *
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| 41 | * Redistribution and use in source and binary forms, with or without
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| 42 | * modification, are permitted provided that the following conditions
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| 43 | * are met:
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| 44 | * 1. Redistributions of source code must retain the above copyright
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| 45 | * notice, this list of conditions and the following disclaimer.
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| 46 | * 2. Redistributions in binary form must reproduce the above copyright
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| 47 | * notice, this list of conditions and the following disclaimer in the
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| 48 | * documentation and/or other materials provided with the distribution.
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| 49 | * 3. Neither the name of the University nor the names of its contributors
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| 50 | * may be used to endorse or promote products derived from this software
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| 51 | * without specific prior written permission.
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| 52 | *
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| 53 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 54 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 55 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 56 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 57 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 58 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 59 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 60 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 61 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 62 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 63 | * SUCH DAMAGE.
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| 64 | *
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| 65 | * @(#)lock.h 8.12 (Berkeley) 5/19/95
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| 66 | */
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| 67 | |||
| 68 | #ifndef _SYS_LOCK_H_
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| 69 | #define _SYS_LOCK_H_
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| 70 | |||
| 71 | #include <sys/stdint.h> |
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| 72 | #include <sys/mutex.h> |
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| 73 | |||
| 74 | #include <machine/lock.h> |
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| 75 | |||
| 76 | #ifdef _KERNEL
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| 77 | |||
| 78 | /*
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| 79 | * From <machine/lock.h>.
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| 80 | */
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| 81 | #ifndef SPINLOCK_SPIN_HOOK
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| 82 | #define SPINLOCK_SPIN_HOOK
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| 83 | #endif
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| 84 | #ifndef SPINLOCK_BACKOFF_HOOK
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| 85 | #define SPINLOCK_BACKOFF_HOOK nullop(NULL) |
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| 86 | #endif
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| 87 | #ifndef SPINLOCK_BACKOFF_MIN
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| 88 | #define SPINLOCK_BACKOFF_MIN 4 |
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| 89 | #endif
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| 90 | #ifndef SPINLOCK_BACKOFF_MAX
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| 91 | #define SPINLOCK_BACKOFF_MAX 128 |
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| 92 | #endif
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| 93 | |||
| 94 | #define SPINLOCK_BACKOFF(count) \
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| 95 | do { \
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| 96 | int __i; \
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| 97 | for (__i = (count); __i != 0; __i--) { \ |
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| 98 | SPINLOCK_BACKOFF_HOOK; \ |
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| 99 | } \ |
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| 100 | if ((count) < SPINLOCK_BACKOFF_MAX) \
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| 101 | (count) += (count); \ |
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| 102 | } while (/* CONSTCOND */ 0); |
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| 103 | |||
| 104 | #define SPINLOCK_RUN_HOOK(count) ((count) >= SPINLOCK_BACKOFF_MAX)
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| 105 | |||
| 106 | #ifdef LOCKDEBUG
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| 107 | #define SPINLOCK_SPINOUT(spins) ((spins)++ > 0x0fffffff) |
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| 108 | #else
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| 109 | #define SPINLOCK_SPINOUT(spins) ((void)(spins), 0) |
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| 110 | #endif
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| 111 | |||
| 112 | extern __cpu_simple_lock_t kernel_lock[];
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| 113 | |||
| 114 | #endif /* _KERNEL */ |
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| 115 | |||
| 116 | #endif /* _SYS_LOCK_H_ */ |