fa4a2ffd58
INVARIANT_SUPPORT is defined so you can build a kernel with INVARIANT_SUPPORT, but build a module with just INVARIANTS on. MFC after: 3 days Reported by: kuriyama
114 lines
4.3 KiB
C
114 lines
4.3 KiB
C
/*-
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* Copyright (C) 2001 Jason Evans <jasone@freebsd.org>. 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(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), 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 COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* 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 SUCH
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* DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_SX_H_
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#define _SYS_SX_H_
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/condvar.h> /* XXX */
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struct sx {
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struct lock_object sx_object; /* Common lock properties. */
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struct mtx *sx_lock; /* General protection lock. */
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int sx_cnt; /* -1: xlock, > 0: slock count. */
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struct cv sx_shrd_cv; /* slock waiters. */
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int sx_shrd_wcnt; /* Number of slock waiters. */
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struct cv sx_excl_cv; /* xlock waiters. */
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int sx_excl_wcnt; /* Number of xlock waiters. */
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struct thread *sx_xholder; /* Thread presently holding xlock. */
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};
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#ifdef _KERNEL
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void sx_sysinit(void *arg);
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void sx_init(struct sx *sx, const char *description);
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void sx_destroy(struct sx *sx);
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void _sx_slock(struct sx *sx, const char *file, int line);
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void _sx_xlock(struct sx *sx, const char *file, int line);
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int _sx_try_slock(struct sx *sx, const char *file, int line);
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int _sx_try_xlock(struct sx *sx, const char *file, int line);
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void _sx_sunlock(struct sx *sx, const char *file, int line);
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void _sx_xunlock(struct sx *sx, const char *file, int line);
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int _sx_try_upgrade(struct sx *sx, const char *file, int line);
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void _sx_downgrade(struct sx *sx, const char *file, int line);
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#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
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void _sx_assert(struct sx *sx, int what, const char *file, int line);
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#endif
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#ifdef DDB
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int sx_chain(struct thread *td, struct thread **ownerp);
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#endif
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struct sx_args {
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struct sx *sa_sx;
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const char *sa_desc;
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};
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#define SX_SYSINIT(name, sxa, desc) \
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static struct sx_args name##_args = { \
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(sxa), \
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(desc) \
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}; \
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SYSINIT(name##_sx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
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sx_sysinit, &name##_args); \
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SYSUNINIT(name##_sx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
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sx_destroy, (sxa))
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#define sx_xlocked(sx) ((sx)->sx_cnt < 0 && (sx)->sx_xholder == curthread)
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#define sx_slock(sx) _sx_slock((sx), LOCK_FILE, LOCK_LINE)
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#define sx_xlock(sx) _sx_xlock((sx), LOCK_FILE, LOCK_LINE)
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#define sx_try_slock(sx) _sx_try_slock((sx), LOCK_FILE, LOCK_LINE)
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#define sx_try_xlock(sx) _sx_try_xlock((sx), LOCK_FILE, LOCK_LINE)
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#define sx_sunlock(sx) _sx_sunlock((sx), LOCK_FILE, LOCK_LINE)
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#define sx_xunlock(sx) _sx_xunlock((sx), LOCK_FILE, LOCK_LINE)
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#define sx_try_upgrade(sx) _sx_try_upgrade((sx), LOCK_FILE, LOCK_LINE)
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#define sx_downgrade(sx) _sx_downgrade((sx), LOCK_FILE, LOCK_LINE)
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#define sx_unlock(sx) do { \
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if (sx_xlocked(sx)) \
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sx_xunlock(sx); \
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else \
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sx_sunlock(sx); \
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} while (0)
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#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
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#define SX_LOCKED LA_LOCKED
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#define SX_SLOCKED LA_SLOCKED
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#define SX_XLOCKED LA_XLOCKED
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#define SX_UNLOCKED LA_UNLOCKED
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#endif
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#ifdef INVARIANTS
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#define sx_assert(sx, what) _sx_assert((sx), (what), LOCK_FILE, LOCK_LINE)
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#else
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#define sx_assert(sx, what)
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#endif
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#endif /* _KERNEL */
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#endif /* !_SYS_SX_H_ */
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