90356491d7
lock_object, using an unified field called lo_data. - Replace lo_type usage with the w_name usage and at init time pass the lock "type" directly to witness_init() from the parent lock init function. Handle delayed initialization before than witness_initialize() is called through the witness_pendhelp structure. - Axe out LO_ENROLLPEND as it is not really needed. The case where the mutex init delayed wants to be destroyed can't happen because witness_destroy() checks for witness_cold and panic in case. - In enroll(), if we cannot allocate a new object from the freelist, notify that to userspace through a printf(). - Modify the depart function in order to return nothing as in the current CVS version it always returns true and adjust callers accordingly. - Fix the witness_addgraph() argument name prototype. - Remove unuseful code from itismychild(). This commit leads to a shrinked struct lock_object and so smaller locks, in particular on amd64 where 2 uintptr_t (16 bytes per-primitive) are gained. Reviewed by: jhb
44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/*-
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* Copyright (c) 2006 John Baldwin <jhb@FreeBSD.org>
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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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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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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* $FreeBSD$
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*/
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#ifndef _SYS__RWLOCK_H_
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#define _SYS__RWLOCK_H_
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/*
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* Reader/writer lock.
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*/
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struct rwlock {
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struct lock_object lock_object;
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volatile uintptr_t rw_lock;
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};
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#endif /* !_SYS__RWLOCK_H_ */
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