5fdaeb281d
Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
59 lines
2.4 KiB
C
59 lines
2.4 KiB
C
/*-
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* Copyright (c) 1998 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#ifndef _MACHINE_ATOMIC_H_
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#define _MACHINE_ATOMIC_H_
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/*
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* Various simple arithmetic on memory which is atomic in the presence
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* of interrupts.
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*
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* Note: these versions are not SMP safe.
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*/
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#define atomic_set_char(P, V) (*(u_char*)(P) |= (V))
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#define atomic_clear_char(P, V) (*(u_char*)(P) &= ~(V))
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#define atomic_add_char(P, V) (*(u_char*)(P) += (V))
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#define atomic_subtract_char(P, V) (*(u_char*)(P) -= (V))
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#define atomic_set_short(P, V) (*(u_short*)(P) |= (V))
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#define atomic_clear_short(P, V) (*(u_short*)(P) &= ~(V))
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#define atomic_add_short(P, V) (*(u_short*)(P) += (V))
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#define atomic_subtract_short(P, V) (*(u_short*)(P) -= (V))
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#define atomic_set_int(P, V) (*(u_int*)(P) |= (V))
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#define atomic_clear_int(P, V) (*(u_int*)(P) &= ~(V))
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#define atomic_add_int(P, V) (*(u_int*)(P) += (V))
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#define atomic_subtract_int(P, V) (*(u_int*)(P) -= (V))
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#define atomic_set_long(P, V) (*(u_long*)(P) |= (V))
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#define atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V))
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#define atomic_add_long(P, V) (*(u_long*)(P) += (V))
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#define atomic_subtract_long(P, V) (*(u_long*)(P) -= (V))
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#endif /* ! _MACHINE_ATOMIC_H_ */
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