3fba886874
The intent is to provide a header that can be included by other headers without introducing too much pollution. smr.h depends on various headers and will likely grow over time, but is less likely to be required by system headers. Rename SMR_TYPE_DECLARE() to SMR_POINTER(): - One might use SMR to protect more than just pointers; it could be used for resizeable arrays, for example, so TYPE seems too generic. - It is useful to be able to define anonymous SMR-protected pointer types and the _DECLARE suffix makes that look wrong. Reviewed by: jeff, mjg, rlibby Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D23988
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019, 2020 Jeffrey Roberson <jeff@FreeBSD.org>
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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 unmodified, this list of conditions, and the following
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* 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef _SYS__SMR_H_
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#define _SYS__SMR_H_
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typedef uint32_t smr_seq_t;
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typedef int32_t smr_delta_t;
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typedef struct smr *smr_t;
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#define SMR_ENTERED(smr) \
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(curthread->td_critnest != 0 && zpcpu_get((smr))->c_seq != SMR_SEQ_INVALID)
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#define SMR_ASSERT_ENTERED(smr) \
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KASSERT(SMR_ENTERED(smr), ("Not in smr section"))
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#define SMR_ASSERT_NOT_ENTERED(smr) \
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KASSERT(!SMR_ENTERED(smr), ("In smr section."));
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#define SMR_ASSERT(ex, fn) \
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KASSERT((ex), (fn ": Assertion " #ex " failed at %s:%d", __FILE__, __LINE__))
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#endif /* __SYS_SMR_H_ */
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