a21018063b
Unclear how, but the locking routine for mutexes was using the *release* barrier instead of acquire. This must have been either a copy-pasto or bad completion. Going through other uses of atomics shows no barriers in: - upgrade routines (addressed in this patch) - sections protected with turnstile locks - this should be fine as necessary barriers are in the worst case provided by turnstile unlock I would like to thank Mark Millard and andreast@ for reporting the problem and testing previous patches before the issue got identified. ps. .-'---`-. ,' `. | \ | \ \ _ \ ,\ _ ,'-,/-)\ ( * \ \,' ,' ,'-) `._,) -',-') \/ ''/ ) / / / ,'-' Hardware provided by: IBM LTC
526 lines
18 KiB
C
526 lines
18 KiB
C
/*-
|
|
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Berkeley Software Design Inc's name may not be used to endorse or
|
|
* promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _SYS_MUTEX_H_
|
|
#define _SYS_MUTEX_H_
|
|
|
|
#include <sys/queue.h>
|
|
#include <sys/_lock.h>
|
|
#include <sys/_mutex.h>
|
|
|
|
#ifdef _KERNEL
|
|
#include <sys/pcpu.h>
|
|
#include <sys/lock_profile.h>
|
|
#include <sys/lockstat.h>
|
|
#include <machine/atomic.h>
|
|
#include <machine/cpufunc.h>
|
|
|
|
/*
|
|
* Mutex types and options passed to mtx_init(). MTX_QUIET and MTX_DUPOK
|
|
* can also be passed in.
|
|
*/
|
|
#define MTX_DEF 0x00000000 /* DEFAULT (sleep) lock */
|
|
#define MTX_SPIN 0x00000001 /* Spin lock (disables interrupts) */
|
|
#define MTX_RECURSE 0x00000004 /* Option: lock allowed to recurse */
|
|
#define MTX_NOWITNESS 0x00000008 /* Don't do any witness checking. */
|
|
#define MTX_NOPROFILE 0x00000020 /* Don't profile this lock */
|
|
#define MTX_NEW 0x00000040 /* Don't check for double-init */
|
|
|
|
/*
|
|
* Option flags passed to certain lock/unlock routines, through the use
|
|
* of corresponding mtx_{lock,unlock}_flags() interface macros.
|
|
*/
|
|
#define MTX_QUIET LOP_QUIET /* Don't log a mutex event */
|
|
#define MTX_DUPOK LOP_DUPOK /* Don't log a duplicate acquire */
|
|
|
|
/*
|
|
* State bits kept in mutex->mtx_lock, for the DEFAULT lock type. None of this,
|
|
* with the exception of MTX_UNOWNED, applies to spin locks.
|
|
*/
|
|
#define MTX_RECURSED 0x00000001 /* lock recursed (for MTX_DEF only) */
|
|
#define MTX_CONTESTED 0x00000002 /* lock contested (for MTX_DEF only) */
|
|
#define MTX_UNOWNED 0x00000004 /* Cookie for free mutex */
|
|
#define MTX_FLAGMASK (MTX_RECURSED | MTX_CONTESTED | MTX_UNOWNED)
|
|
|
|
/*
|
|
* Value stored in mutex->mtx_lock to denote a destroyed mutex.
|
|
*/
|
|
#define MTX_DESTROYED (MTX_CONTESTED | MTX_UNOWNED)
|
|
|
|
/*
|
|
* Prototypes
|
|
*
|
|
* NOTE: Functions prepended with `_' (underscore) are exported to other parts
|
|
* of the kernel via macros, thus allowing us to use the cpp LOCK_FILE
|
|
* and LOCK_LINE or for hiding the lock cookie crunching to the
|
|
* consumers. These functions should not be called directly by any
|
|
* code using the API. Their macros cover their functionality.
|
|
* Functions with a `_' suffix are the entrypoint for the common
|
|
* KPI covering both compat shims and fast path case. These can be
|
|
* used by consumers willing to pass options, file and line
|
|
* informations, in an option-independent way.
|
|
*
|
|
* [See below for descriptions]
|
|
*
|
|
*/
|
|
void _mtx_init(volatile uintptr_t *c, const char *name, const char *type,
|
|
int opts);
|
|
void _mtx_destroy(volatile uintptr_t *c);
|
|
void mtx_sysinit(void *arg);
|
|
int _mtx_trylock_flags_(volatile uintptr_t *c, int opts, const char *file,
|
|
int line);
|
|
void mutex_init(void);
|
|
#if LOCK_DEBUG > 0
|
|
void __mtx_lock_sleep(volatile uintptr_t *c, uintptr_t v, uintptr_t tid,
|
|
int opts, const char *file, int line);
|
|
void __mtx_unlock_sleep(volatile uintptr_t *c, int opts, const char *file,
|
|
int line);
|
|
#else
|
|
void __mtx_lock_sleep(volatile uintptr_t *c, uintptr_t v, uintptr_t tid);
|
|
void __mtx_unlock_sleep(volatile uintptr_t *c);
|
|
#endif
|
|
|
|
#ifdef SMP
|
|
void _mtx_lock_spin_cookie(volatile uintptr_t *c, uintptr_t v, uintptr_t tid,
|
|
int opts, const char *file, int line);
|
|
#endif
|
|
void __mtx_lock_flags(volatile uintptr_t *c, int opts, const char *file,
|
|
int line);
|
|
void __mtx_unlock_flags(volatile uintptr_t *c, int opts, const char *file,
|
|
int line);
|
|
void __mtx_lock_spin_flags(volatile uintptr_t *c, int opts, const char *file,
|
|
int line);
|
|
int __mtx_trylock_spin_flags(volatile uintptr_t *c, int opts,
|
|
const char *file, int line);
|
|
void __mtx_unlock_spin_flags(volatile uintptr_t *c, int opts,
|
|
const char *file, int line);
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
void __mtx_assert(const volatile uintptr_t *c, int what, const char *file,
|
|
int line);
|
|
#endif
|
|
void thread_lock_flags_(struct thread *, int, const char *, int);
|
|
|
|
#define thread_lock(tdp) \
|
|
thread_lock_flags_((tdp), 0, __FILE__, __LINE__)
|
|
#define thread_lock_flags(tdp, opt) \
|
|
thread_lock_flags_((tdp), (opt), __FILE__, __LINE__)
|
|
#define thread_unlock(tdp) \
|
|
mtx_unlock_spin((tdp)->td_lock)
|
|
|
|
/*
|
|
* Top-level macros to provide lock cookie once the actual mtx is passed.
|
|
* They will also prevent passing a malformed object to the mtx KPI by
|
|
* failing compilation as the mtx_lock reserved member will not be found.
|
|
*/
|
|
#define mtx_init(m, n, t, o) \
|
|
_mtx_init(&(m)->mtx_lock, n, t, o)
|
|
#define mtx_destroy(m) \
|
|
_mtx_destroy(&(m)->mtx_lock)
|
|
#define mtx_trylock_flags_(m, o, f, l) \
|
|
_mtx_trylock_flags_(&(m)->mtx_lock, o, f, l)
|
|
#if LOCK_DEBUG > 0
|
|
#define _mtx_lock_sleep(m, v, t, o, f, l) \
|
|
__mtx_lock_sleep(&(m)->mtx_lock, v, t, o, f, l)
|
|
#define _mtx_unlock_sleep(m, o, f, l) \
|
|
__mtx_unlock_sleep(&(m)->mtx_lock, o, f, l)
|
|
#else
|
|
#define _mtx_lock_sleep(m, v, t, o, f, l) \
|
|
__mtx_lock_sleep(&(m)->mtx_lock, v, t)
|
|
#define _mtx_unlock_sleep(m, o, f, l) \
|
|
__mtx_unlock_sleep(&(m)->mtx_lock)
|
|
#endif
|
|
#ifdef SMP
|
|
#define _mtx_lock_spin(m, v, t, o, f, l) \
|
|
_mtx_lock_spin_cookie(&(m)->mtx_lock, v, t, o, f, l)
|
|
#endif
|
|
#define _mtx_lock_flags(m, o, f, l) \
|
|
__mtx_lock_flags(&(m)->mtx_lock, o, f, l)
|
|
#define _mtx_unlock_flags(m, o, f, l) \
|
|
__mtx_unlock_flags(&(m)->mtx_lock, o, f, l)
|
|
#define _mtx_lock_spin_flags(m, o, f, l) \
|
|
__mtx_lock_spin_flags(&(m)->mtx_lock, o, f, l)
|
|
#define _mtx_trylock_spin_flags(m, o, f, l) \
|
|
__mtx_trylock_spin_flags(&(m)->mtx_lock, o, f, l)
|
|
#define _mtx_unlock_spin_flags(m, o, f, l) \
|
|
__mtx_unlock_spin_flags(&(m)->mtx_lock, o, f, l)
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
#define _mtx_assert(m, w, f, l) \
|
|
__mtx_assert(&(m)->mtx_lock, w, f, l)
|
|
#endif
|
|
|
|
#define mtx_recurse lock_object.lo_data
|
|
|
|
/* Very simple operations on mtx_lock. */
|
|
|
|
/* Try to obtain mtx_lock once. */
|
|
#define _mtx_obtain_lock(mp, tid) \
|
|
atomic_cmpset_acq_ptr(&(mp)->mtx_lock, MTX_UNOWNED, (tid))
|
|
|
|
#define _mtx_obtain_lock_fetch(mp, vp, tid) \
|
|
atomic_fcmpset_acq_ptr(&(mp)->mtx_lock, vp, (tid))
|
|
|
|
/* Try to release mtx_lock if it is unrecursed and uncontested. */
|
|
#define _mtx_release_lock(mp, tid) \
|
|
atomic_cmpset_rel_ptr(&(mp)->mtx_lock, (tid), MTX_UNOWNED)
|
|
|
|
/* Release mtx_lock quickly, assuming we own it. */
|
|
#define _mtx_release_lock_quick(mp) \
|
|
atomic_store_rel_ptr(&(mp)->mtx_lock, MTX_UNOWNED)
|
|
|
|
/*
|
|
* Full lock operations that are suitable to be inlined in non-debug
|
|
* kernels. If the lock cannot be acquired or released trivially then
|
|
* the work is deferred to another function.
|
|
*/
|
|
|
|
/* Lock a normal mutex. */
|
|
#define __mtx_lock(mp, tid, opts, file, line) do { \
|
|
uintptr_t _tid = (uintptr_t)(tid); \
|
|
uintptr_t _v = MTX_UNOWNED; \
|
|
\
|
|
if (__predict_false(LOCKSTAT_PROFILE_ENABLED(adaptive__acquire) ||\
|
|
!_mtx_obtain_lock_fetch((mp), &_v, _tid))) \
|
|
_mtx_lock_sleep((mp), _v, _tid, (opts), (file), (line));\
|
|
} while (0)
|
|
|
|
/*
|
|
* Lock a spin mutex. For spinlocks, we handle recursion inline (it
|
|
* turns out that function calls can be significantly expensive on
|
|
* some architectures). Since spin locks are not _too_ common,
|
|
* inlining this code is not too big a deal.
|
|
*/
|
|
#ifdef SMP
|
|
#define __mtx_lock_spin(mp, tid, opts, file, line) do { \
|
|
uintptr_t _tid = (uintptr_t)(tid); \
|
|
uintptr_t _v = MTX_UNOWNED; \
|
|
\
|
|
spinlock_enter(); \
|
|
if (!_mtx_obtain_lock_fetch((mp), &_v, _tid)) \
|
|
_mtx_lock_spin((mp), _v, _tid, (opts), (file), (line)); \
|
|
else \
|
|
LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, \
|
|
mp, 0, 0, file, line); \
|
|
} while (0)
|
|
#define __mtx_trylock_spin(mp, tid, opts, file, line) __extension__ ({ \
|
|
uintptr_t _tid = (uintptr_t)(tid); \
|
|
int _ret; \
|
|
\
|
|
spinlock_enter(); \
|
|
if (((mp)->mtx_lock != MTX_UNOWNED || !_mtx_obtain_lock((mp), _tid))) {\
|
|
spinlock_exit(); \
|
|
_ret = 0; \
|
|
} else { \
|
|
LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, \
|
|
mp, 0, 0, file, line); \
|
|
_ret = 1; \
|
|
} \
|
|
_ret; \
|
|
})
|
|
#else /* SMP */
|
|
#define __mtx_lock_spin(mp, tid, opts, file, line) do { \
|
|
uintptr_t _tid = (uintptr_t)(tid); \
|
|
\
|
|
spinlock_enter(); \
|
|
if ((mp)->mtx_lock == _tid) \
|
|
(mp)->mtx_recurse++; \
|
|
else { \
|
|
KASSERT((mp)->mtx_lock == MTX_UNOWNED, ("corrupt spinlock")); \
|
|
(mp)->mtx_lock = _tid; \
|
|
} \
|
|
} while (0)
|
|
#define __mtx_trylock_spin(mp, tid, opts, file, line) __extension__ ({ \
|
|
uintptr_t _tid = (uintptr_t)(tid); \
|
|
int _ret; \
|
|
\
|
|
spinlock_enter(); \
|
|
if ((mp)->mtx_lock != MTX_UNOWNED) { \
|
|
spinlock_exit(); \
|
|
_ret = 0; \
|
|
} else { \
|
|
(mp)->mtx_lock = _tid; \
|
|
_ret = 1; \
|
|
} \
|
|
_ret; \
|
|
})
|
|
#endif /* SMP */
|
|
|
|
/* Unlock a normal mutex. */
|
|
#define __mtx_unlock(mp, tid, opts, file, line) do { \
|
|
uintptr_t _tid = (uintptr_t)(tid); \
|
|
\
|
|
if (__predict_false(LOCKSTAT_PROFILE_ENABLED(adaptive__release) ||\
|
|
!_mtx_release_lock((mp), _tid))) \
|
|
_mtx_unlock_sleep((mp), (opts), (file), (line)); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Unlock a spin mutex. For spinlocks, we can handle everything
|
|
* inline, as it's pretty simple and a function call would be too
|
|
* expensive (at least on some architectures). Since spin locks are
|
|
* not _too_ common, inlining this code is not too big a deal.
|
|
*
|
|
* Since we always perform a spinlock_enter() when attempting to acquire a
|
|
* spin lock, we need to always perform a matching spinlock_exit() when
|
|
* releasing a spin lock. This includes the recursion cases.
|
|
*/
|
|
#ifdef SMP
|
|
#define __mtx_unlock_spin(mp) do { \
|
|
if (mtx_recursed((mp))) \
|
|
(mp)->mtx_recurse--; \
|
|
else { \
|
|
LOCKSTAT_PROFILE_RELEASE_LOCK(spin__release, mp); \
|
|
_mtx_release_lock_quick((mp)); \
|
|
} \
|
|
spinlock_exit(); \
|
|
} while (0)
|
|
#else /* SMP */
|
|
#define __mtx_unlock_spin(mp) do { \
|
|
if (mtx_recursed((mp))) \
|
|
(mp)->mtx_recurse--; \
|
|
else { \
|
|
LOCKSTAT_PROFILE_RELEASE_LOCK(spin__release, mp); \
|
|
(mp)->mtx_lock = MTX_UNOWNED; \
|
|
} \
|
|
spinlock_exit(); \
|
|
} while (0)
|
|
#endif /* SMP */
|
|
|
|
/*
|
|
* Exported lock manipulation interface.
|
|
*
|
|
* mtx_lock(m) locks MTX_DEF mutex `m'
|
|
*
|
|
* mtx_lock_spin(m) locks MTX_SPIN mutex `m'
|
|
*
|
|
* mtx_unlock(m) unlocks MTX_DEF mutex `m'
|
|
*
|
|
* mtx_unlock_spin(m) unlocks MTX_SPIN mutex `m'
|
|
*
|
|
* mtx_lock_spin_flags(m, opts) and mtx_lock_flags(m, opts) locks mutex `m'
|
|
* and passes option flags `opts' to the "hard" function, if required.
|
|
* With these routines, it is possible to pass flags such as MTX_QUIET
|
|
* to the appropriate lock manipulation routines.
|
|
*
|
|
* mtx_trylock(m) attempts to acquire MTX_DEF mutex `m' but doesn't sleep if
|
|
* it cannot. Rather, it returns 0 on failure and non-zero on success.
|
|
* It does NOT handle recursion as we assume that if a caller is properly
|
|
* using this part of the interface, he will know that the lock in question
|
|
* is _not_ recursed.
|
|
*
|
|
* mtx_trylock_flags(m, opts) is used the same way as mtx_trylock() but accepts
|
|
* relevant option flags `opts.'
|
|
*
|
|
* mtx_trylock_spin(m) attempts to acquire MTX_SPIN mutex `m' but doesn't
|
|
* spin if it cannot. Rather, it returns 0 on failure and non-zero on
|
|
* success. It always returns failure for recursed lock attempts.
|
|
*
|
|
* mtx_initialized(m) returns non-zero if the lock `m' has been initialized.
|
|
*
|
|
* mtx_owned(m) returns non-zero if the current thread owns the lock `m'
|
|
*
|
|
* mtx_recursed(m) returns non-zero if the lock `m' is presently recursed.
|
|
*/
|
|
#define mtx_lock(m) mtx_lock_flags((m), 0)
|
|
#define mtx_lock_spin(m) mtx_lock_spin_flags((m), 0)
|
|
#define mtx_trylock(m) mtx_trylock_flags((m), 0)
|
|
#define mtx_trylock_spin(m) mtx_trylock_spin_flags((m), 0)
|
|
#define mtx_unlock(m) mtx_unlock_flags((m), 0)
|
|
#define mtx_unlock_spin(m) mtx_unlock_spin_flags((m), 0)
|
|
|
|
struct mtx_pool;
|
|
|
|
struct mtx_pool *mtx_pool_create(const char *mtx_name, int pool_size, int opts);
|
|
void mtx_pool_destroy(struct mtx_pool **poolp);
|
|
struct mtx *mtx_pool_find(struct mtx_pool *pool, void *ptr);
|
|
struct mtx *mtx_pool_alloc(struct mtx_pool *pool);
|
|
#define mtx_pool_lock(pool, ptr) \
|
|
mtx_lock(mtx_pool_find((pool), (ptr)))
|
|
#define mtx_pool_lock_spin(pool, ptr) \
|
|
mtx_lock_spin(mtx_pool_find((pool), (ptr)))
|
|
#define mtx_pool_unlock(pool, ptr) \
|
|
mtx_unlock(mtx_pool_find((pool), (ptr)))
|
|
#define mtx_pool_unlock_spin(pool, ptr) \
|
|
mtx_unlock_spin(mtx_pool_find((pool), (ptr)))
|
|
|
|
/*
|
|
* mtxpool_sleep is a general purpose pool of sleep mutexes.
|
|
*/
|
|
extern struct mtx_pool *mtxpool_sleep;
|
|
|
|
#ifndef LOCK_DEBUG
|
|
#error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/mutex.h>
|
|
#endif
|
|
#if LOCK_DEBUG > 0 || defined(MUTEX_NOINLINE)
|
|
#define mtx_lock_flags_(m, opts, file, line) \
|
|
_mtx_lock_flags((m), (opts), (file), (line))
|
|
#define mtx_unlock_flags_(m, opts, file, line) \
|
|
_mtx_unlock_flags((m), (opts), (file), (line))
|
|
#define mtx_lock_spin_flags_(m, opts, file, line) \
|
|
_mtx_lock_spin_flags((m), (opts), (file), (line))
|
|
#define mtx_trylock_spin_flags_(m, opts, file, line) \
|
|
_mtx_trylock_spin_flags((m), (opts), (file), (line))
|
|
#define mtx_unlock_spin_flags_(m, opts, file, line) \
|
|
_mtx_unlock_spin_flags((m), (opts), (file), (line))
|
|
#else /* LOCK_DEBUG == 0 && !MUTEX_NOINLINE */
|
|
#define mtx_lock_flags_(m, opts, file, line) \
|
|
__mtx_lock((m), curthread, (opts), (file), (line))
|
|
#define mtx_unlock_flags_(m, opts, file, line) \
|
|
__mtx_unlock((m), curthread, (opts), (file), (line))
|
|
#define mtx_lock_spin_flags_(m, opts, file, line) \
|
|
__mtx_lock_spin((m), curthread, (opts), (file), (line))
|
|
#define mtx_trylock_spin_flags_(m, opts, file, line) \
|
|
__mtx_trylock_spin((m), curthread, (opts), (file), (line))
|
|
#define mtx_unlock_spin_flags_(m, opts, file, line) \
|
|
__mtx_unlock_spin((m))
|
|
#endif /* LOCK_DEBUG > 0 || MUTEX_NOINLINE */
|
|
|
|
#ifdef INVARIANTS
|
|
#define mtx_assert_(m, what, file, line) \
|
|
_mtx_assert((m), (what), (file), (line))
|
|
|
|
#define GIANT_REQUIRED mtx_assert_(&Giant, MA_OWNED, __FILE__, __LINE__)
|
|
|
|
#else /* INVARIANTS */
|
|
#define mtx_assert_(m, what, file, line) (void)0
|
|
#define GIANT_REQUIRED
|
|
#endif /* INVARIANTS */
|
|
|
|
#define mtx_lock_flags(m, opts) \
|
|
mtx_lock_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
|
|
#define mtx_unlock_flags(m, opts) \
|
|
mtx_unlock_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
|
|
#define mtx_lock_spin_flags(m, opts) \
|
|
mtx_lock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
|
|
#define mtx_unlock_spin_flags(m, opts) \
|
|
mtx_unlock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
|
|
#define mtx_trylock_flags(m, opts) \
|
|
mtx_trylock_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
|
|
#define mtx_trylock_spin_flags(m, opts) \
|
|
mtx_trylock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE)
|
|
#define mtx_assert(m, what) \
|
|
mtx_assert_((m), (what), __FILE__, __LINE__)
|
|
|
|
#define mtx_sleep(chan, mtx, pri, wmesg, timo) \
|
|
_sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \
|
|
tick_sbt * (timo), 0, C_HARDCLOCK)
|
|
|
|
#define MTX_READ_VALUE(m) ((m)->mtx_lock)
|
|
|
|
#define mtx_initialized(m) lock_initialized(&(m)->lock_object)
|
|
|
|
#define lv_mtx_owner(v) ((struct thread *)((v) & ~MTX_FLAGMASK))
|
|
|
|
#define mtx_owner(m) lv_mtx_owner(MTX_READ_VALUE(m))
|
|
|
|
#define mtx_owned(m) (mtx_owner(m) == curthread)
|
|
|
|
#define mtx_recursed(m) ((m)->mtx_recurse != 0)
|
|
|
|
#define mtx_name(m) ((m)->lock_object.lo_name)
|
|
|
|
/*
|
|
* Global locks.
|
|
*/
|
|
extern struct mtx Giant;
|
|
extern struct mtx blocked_lock;
|
|
|
|
/*
|
|
* Giant lock manipulation and clean exit macros.
|
|
* Used to replace return with an exit Giant and return.
|
|
*
|
|
* Note that DROP_GIANT*() needs to be paired with PICKUP_GIANT()
|
|
* The #ifndef is to allow lint-like tools to redefine DROP_GIANT.
|
|
*/
|
|
#ifndef DROP_GIANT
|
|
#define DROP_GIANT() \
|
|
do { \
|
|
int _giantcnt = 0; \
|
|
WITNESS_SAVE_DECL(Giant); \
|
|
\
|
|
if (mtx_owned(&Giant)) { \
|
|
WITNESS_SAVE(&Giant.lock_object, Giant); \
|
|
for (_giantcnt = 0; mtx_owned(&Giant) && \
|
|
!SCHEDULER_STOPPED(); _giantcnt++) \
|
|
mtx_unlock(&Giant); \
|
|
}
|
|
|
|
#define PICKUP_GIANT() \
|
|
PARTIAL_PICKUP_GIANT(); \
|
|
} while (0)
|
|
|
|
#define PARTIAL_PICKUP_GIANT() \
|
|
mtx_assert(&Giant, MA_NOTOWNED); \
|
|
if (_giantcnt > 0) { \
|
|
while (_giantcnt--) \
|
|
mtx_lock(&Giant); \
|
|
WITNESS_RESTORE(&Giant.lock_object, Giant); \
|
|
}
|
|
#endif
|
|
|
|
struct mtx_args {
|
|
void *ma_mtx;
|
|
const char *ma_desc;
|
|
int ma_opts;
|
|
};
|
|
|
|
#define MTX_SYSINIT(name, mtx, desc, opts) \
|
|
static struct mtx_args name##_args = { \
|
|
(mtx), \
|
|
(desc), \
|
|
(opts) \
|
|
}; \
|
|
SYSINIT(name##_mtx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
mtx_sysinit, &name##_args); \
|
|
SYSUNINIT(name##_mtx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
_mtx_destroy, __DEVOLATILE(void *, &(mtx)->mtx_lock))
|
|
|
|
/*
|
|
* The INVARIANTS-enabled mtx_assert() functionality.
|
|
*
|
|
* The constants need to be defined for INVARIANT_SUPPORT infrastructure
|
|
* support as _mtx_assert() itself uses them and the latter implies that
|
|
* _mtx_assert() must build.
|
|
*/
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
#define MA_OWNED LA_XLOCKED
|
|
#define MA_NOTOWNED LA_UNLOCKED
|
|
#define MA_RECURSED LA_RECURSED
|
|
#define MA_NOTRECURSED LA_NOTRECURSED
|
|
#endif
|
|
|
|
/*
|
|
* Common lock type names.
|
|
*/
|
|
#define MTX_NETWORK_LOCK "network driver"
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _SYS_MUTEX_H_ */
|