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freebsd/sys/kern/kern_mutex.c
John Baldwin ba48b69a13 Remove definition of witness and comment stating that this file implements
witness.  Witness moved off to subr_witness.c a while ago.
2001-11-15 19:08:55 +00:00

744 lines
19 KiB
C

/*-
* Copyright (c) 1998 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_witness.c,v 1.1.2.20 2000/04/27 03:10:27 cp Exp $
* and BSDI $Id: synch_machdep.c,v 2.3.2.39 2000/04/27 03:10:25 cp Exp $
* $FreeBSD$
*/
/*
* Machine independent bits of mutex implementation.
*/
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>
#include <sys/ktr.h>
#include <machine/atomic.h>
#include <machine/bus.h>
#include <machine/clock.h>
#include <machine/cpu.h>
#include <ddb/ddb.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
/*
* Internal utility macros.
*/
#define mtx_unowned(m) ((m)->mtx_lock == MTX_UNOWNED)
#define mtx_owner(m) (mtx_unowned((m)) ? NULL \
: (struct thread *)((m)->mtx_lock & MTX_FLAGMASK))
#define SET_PRIO(td, pri) (td)->td_ksegrp->kg_pri.pri_level = (pri)
/*
* Lock classes for sleep and spin mutexes.
*/
struct lock_class lock_class_mtx_sleep = {
"sleep mutex",
LC_SLEEPLOCK | LC_RECURSABLE
};
struct lock_class lock_class_mtx_spin = {
"spin mutex",
LC_SPINLOCK | LC_RECURSABLE
};
/*
* Prototypes for non-exported routines.
*/
static void propagate_priority(struct thread *);
static void
propagate_priority(struct thread *td)
{
struct ksegrp *kg = td->td_ksegrp;
int pri = kg->kg_pri.pri_level;
struct mtx *m = td->td_blocked;
mtx_assert(&sched_lock, MA_OWNED);
for (;;) {
struct thread *td1;
td = mtx_owner(m);
if (td == NULL) {
/*
* This really isn't quite right. Really
* ought to bump priority of thread that
* next acquires the mutex.
*/
MPASS(m->mtx_lock == MTX_CONTESTED);
return;
}
kg = td->td_ksegrp;
MPASS(td->td_proc->p_magic == P_MAGIC);
KASSERT(td->td_proc->p_stat != SSLEEP, ("sleeping thread owns a mutex"));
if (kg->kg_pri.pri_level <= pri) /* lower is higher priority */
return;
/*
* Bump this thread's priority.
*/
SET_PRIO(td, pri);
/*
* If lock holder is actually running, just bump priority.
*/
/* XXXKSE this test is not sufficient */
if (td->td_kse && (td->td_kse->ke_oncpu != NOCPU)) {
MPASS(td->td_proc->p_stat == SRUN
|| td->td_proc->p_stat == SZOMB
|| td->td_proc->p_stat == SSTOP);
return;
}
#ifndef SMP
/*
* For UP, we check to see if td is curthread (this shouldn't
* ever happen however as it would mean we are in a deadlock.)
*/
KASSERT(td != curthread, ("Deadlock detected"));
#endif
/*
* If on run queue move to new run queue, and quit.
* XXXKSE this gets a lot more complicated under threads
* but try anyhow.
*/
if (td->td_proc->p_stat == SRUN) {
MPASS(td->td_blocked == NULL);
remrunqueue(td);
setrunqueue(td);
return;
}
/*
* If we aren't blocked on a mutex, we should be.
*/
KASSERT(td->td_proc->p_stat == SMTX, (
"process %d(%s):%d holds %s but isn't blocked on a mutex\n",
td->td_proc->p_pid, td->td_proc->p_comm, td->td_proc->p_stat,
m->mtx_object.lo_name));
/*
* Pick up the mutex that td is blocked on.
*/
m = td->td_blocked;
MPASS(m != NULL);
/*
* Check if the thread needs to be moved up on
* the blocked chain
*/
if (td == TAILQ_FIRST(&m->mtx_blocked)) {
continue;
}
td1 = TAILQ_PREV(td, threadqueue, td_blkq);
if (td1->td_ksegrp->kg_pri.pri_level <= pri) {
continue;
}
/*
* Remove thread from blocked chain and determine where
* it should be moved up to. Since we know that td1 has
* a lower priority than td, we know that at least one
* thread in the chain has a lower priority and that
* td1 will thus not be NULL after the loop.
*/
TAILQ_REMOVE(&m->mtx_blocked, td, td_blkq);
TAILQ_FOREACH(td1, &m->mtx_blocked, td_blkq) {
MPASS(td1->td_proc->p_magic == P_MAGIC);
if (td1->td_ksegrp->kg_pri.pri_level > pri)
break;
}
MPASS(td1 != NULL);
TAILQ_INSERT_BEFORE(td1, td, td_blkq);
CTR4(KTR_LOCK,
"propagate_priority: p %p moved before %p on [%p] %s",
td, td1, m, m->mtx_object.lo_name);
}
}
/*
* Function versions of the inlined __mtx_* macros. These are used by
* modules and can also be called from assembly language if needed.
*/
void
_mtx_lock_flags(struct mtx *m, int opts, const char *file, int line)
{
MPASS(curthread != NULL);
KASSERT((opts & MTX_NOSWITCH) == 0,
("MTX_NOSWITCH used at %s:%d", file, line));
_get_sleep_lock(m, curthread, opts, file, line);
LOCK_LOG_LOCK("LOCK", &m->mtx_object, opts, m->mtx_recurse, file,
line);
WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line);
}
void
_mtx_unlock_flags(struct mtx *m, int opts, const char *file, int line)
{
MPASS(curthread != NULL);
mtx_assert(m, MA_OWNED);
WITNESS_UNLOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line);
LOCK_LOG_LOCK("UNLOCK", &m->mtx_object, opts, m->mtx_recurse, file,
line);
_rel_sleep_lock(m, curthread, opts, file, line);
}
void
_mtx_lock_spin_flags(struct mtx *m, int opts, const char *file, int line)
{
MPASS(curthread != NULL);
_get_spin_lock(m, curthread, opts, file, line);
LOCK_LOG_LOCK("LOCK", &m->mtx_object, opts, m->mtx_recurse, file,
line);
WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line);
}
void
_mtx_unlock_spin_flags(struct mtx *m, int opts, const char *file, int line)
{
MPASS(curthread != NULL);
mtx_assert(m, MA_OWNED);
WITNESS_UNLOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line);
LOCK_LOG_LOCK("UNLOCK", &m->mtx_object, opts, m->mtx_recurse, file,
line);
_rel_spin_lock(m);
}
/*
* The important part of mtx_trylock{,_flags}()
* Tries to acquire lock `m.' We do NOT handle recursion here; we assume that
* if we're called, it's because we know we don't already own this lock.
*/
int
_mtx_trylock(struct mtx *m, int opts, const char *file, int line)
{
int rval;
MPASS(curthread != NULL);
/*
* _mtx_trylock does not accept MTX_NOSWITCH option.
*/
KASSERT((opts & MTX_NOSWITCH) == 0,
("mtx_trylock() called with invalid option flag(s) %d", opts));
rval = _obtain_lock(m, curthread);
LOCK_LOG_TRY("LOCK", &m->mtx_object, opts, rval, file, line);
if (rval) {
/*
* We do not handle recursion in _mtx_trylock; see the
* note at the top of the routine.
*/
KASSERT(!mtx_recursed(m),
("mtx_trylock() called on a recursed mutex"));
WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE | LOP_TRYLOCK,
file, line);
}
return (rval);
}
/*
* _mtx_lock_sleep: the tougher part of acquiring an MTX_DEF lock.
*
* We call this if the lock is either contested (i.e. we need to go to
* sleep waiting for it), or if we need to recurse on it.
*/
void
_mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
{
struct thread *td = curthread;
struct ksegrp *kg = td->td_ksegrp;
if ((m->mtx_lock & MTX_FLAGMASK) == (uintptr_t)td) {
m->mtx_recurse++;
atomic_set_ptr(&m->mtx_lock, MTX_RECURSED);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recursing", m);
return;
}
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR4(KTR_LOCK,
"_mtx_lock_sleep: %s contested (lock=%p) at %s:%d",
m->mtx_object.lo_name, (void *)m->mtx_lock, file, line);
while (!_obtain_lock(m, td)) {
uintptr_t v;
struct thread *td1;
mtx_lock_spin(&sched_lock);
/*
* Check if the lock has been released while spinning for
* the sched_lock.
*/
if ((v = m->mtx_lock) == MTX_UNOWNED) {
mtx_unlock_spin(&sched_lock);
continue;
}
/*
* The mutex was marked contested on release. This means that
* there are threads blocked on it.
*/
if (v == MTX_CONTESTED) {
td1 = TAILQ_FIRST(&m->mtx_blocked);
MPASS(td1 != NULL);
m->mtx_lock = (uintptr_t)td | MTX_CONTESTED;
if (td1->td_ksegrp->kg_pri.pri_level < kg->kg_pri.pri_level)
SET_PRIO(td, td1->td_ksegrp->kg_pri.pri_level);
mtx_unlock_spin(&sched_lock);
return;
}
/*
* If the mutex isn't already contested and a failure occurs
* setting the contested bit, the mutex was either released
* or the state of the MTX_RECURSED bit changed.
*/
if ((v & MTX_CONTESTED) == 0 &&
!atomic_cmpset_ptr(&m->mtx_lock, (void *)v,
(void *)(v | MTX_CONTESTED))) {
mtx_unlock_spin(&sched_lock);
continue;
}
/*
* We deffinately must sleep for this lock.
*/
mtx_assert(m, MA_NOTOWNED);
#ifdef notyet
/*
* If we're borrowing an interrupted thread's VM context, we
* must clean up before going to sleep.
*/
if (td->td_ithd != NULL) {
struct ithd *it = td->td_ithd;
if (it->it_interrupted) {
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR2(KTR_LOCK,
"_mtx_lock_sleep: %p interrupted %p",
it, it->it_interrupted);
intr_thd_fixup(it);
}
}
#endif
/*
* Put us on the list of threads blocked on this mutex.
*/
if (TAILQ_EMPTY(&m->mtx_blocked)) {
td1 = (struct thread *)(m->mtx_lock & MTX_FLAGMASK);
LIST_INSERT_HEAD(&td1->td_contested, m, mtx_contested);
TAILQ_INSERT_TAIL(&m->mtx_blocked, td, td_blkq);
} else {
TAILQ_FOREACH(td1, &m->mtx_blocked, td_blkq)
if (td1->td_ksegrp->kg_pri.pri_level > kg->kg_pri.pri_level)
break;
if (td1)
TAILQ_INSERT_BEFORE(td1, td, td_blkq);
else
TAILQ_INSERT_TAIL(&m->mtx_blocked, td, td_blkq);
}
/*
* Save who we're blocked on.
*/
td->td_blocked = m;
td->td_mtxname = m->mtx_object.lo_name;
td->td_proc->p_stat = SMTX;
propagate_priority(td);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR3(KTR_LOCK,
"_mtx_lock_sleep: p %p blocked on [%p] %s", td, m,
m->mtx_object.lo_name);
td->td_proc->p_stats->p_ru.ru_nvcsw++;
mi_switch();
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR3(KTR_LOCK,
"_mtx_lock_sleep: p %p free from blocked on [%p] %s",
td, m, m->mtx_object.lo_name);
mtx_unlock_spin(&sched_lock);
}
return;
}
/*
* _mtx_lock_spin: the tougher part of acquiring an MTX_SPIN lock.
*
* This is only called if we need to actually spin for the lock. Recursion
* is handled inline.
*/
void
_mtx_lock_spin(struct mtx *m, int opts, critical_t mtx_crit, const char *file,
int line)
{
int i = 0;
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR1(KTR_LOCK, "_mtx_lock_spin: %p spinning", m);
for (;;) {
if (_obtain_lock(m, curthread))
break;
/* Give interrupts a chance while we spin. */
critical_exit(mtx_crit);
while (m->mtx_lock != MTX_UNOWNED) {
if (i++ < 1000000)
continue;
if (i++ < 6000000)
DELAY(1);
#ifdef DDB
else if (!db_active)
#else
else
#endif
panic("spin lock %s held by %p for > 5 seconds",
m->mtx_object.lo_name, (void *)m->mtx_lock);
}
mtx_crit = critical_enter();
}
m->mtx_savecrit = mtx_crit;
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR1(KTR_LOCK, "_mtx_lock_spin: %p spin done", m);
return;
}
/*
* _mtx_unlock_sleep: the tougher part of releasing an MTX_DEF lock.
*
* We are only called here if the lock is recursed or contested (i.e. we
* need to wake up a blocked thread).
*/
void
_mtx_unlock_sleep(struct mtx *m, int opts, const char *file, int line)
{
struct thread *td, *td1;
struct mtx *m1;
int pri;
struct ksegrp *kg;
td = curthread;
kg = td->td_ksegrp;
if (mtx_recursed(m)) {
if (--(m->mtx_recurse) == 0)
atomic_clear_ptr(&m->mtx_lock, MTX_RECURSED);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR1(KTR_LOCK, "_mtx_unlock_sleep: %p unrecurse", m);
return;
}
mtx_lock_spin(&sched_lock);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR1(KTR_LOCK, "_mtx_unlock_sleep: %p contested", m);
td1 = TAILQ_FIRST(&m->mtx_blocked);
MPASS(td->td_proc->p_magic == P_MAGIC);
MPASS(td1->td_proc->p_magic == P_MAGIC);
TAILQ_REMOVE(&m->mtx_blocked, td1, td_blkq);
if (TAILQ_EMPTY(&m->mtx_blocked)) {
LIST_REMOVE(m, mtx_contested);
_release_lock_quick(m);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR1(KTR_LOCK, "_mtx_unlock_sleep: %p not held", m);
} else
atomic_store_rel_ptr(&m->mtx_lock, (void *)MTX_CONTESTED);
pri = PRI_MAX;
LIST_FOREACH(m1, &td->td_contested, mtx_contested) {
int cp = TAILQ_FIRST(&m1->mtx_blocked)->td_ksegrp->kg_pri.pri_level;
if (cp < pri)
pri = cp;
}
if (pri > kg->kg_pri.pri_native)
pri = kg->kg_pri.pri_native;
SET_PRIO(td, pri);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR2(KTR_LOCK, "_mtx_unlock_sleep: %p contested setrunqueue %p",
m, td1);
td1->td_blocked = NULL;
td1->td_proc->p_stat = SRUN;
setrunqueue(td1);
if ((opts & MTX_NOSWITCH) == 0 && td1->td_ksegrp->kg_pri.pri_level < pri) {
#ifdef notyet
if (td->td_ithd != NULL) {
struct ithd *it = td->td_ithd;
if (it->it_interrupted) {
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR2(KTR_LOCK,
"_mtx_unlock_sleep: %p interrupted %p",
it, it->it_interrupted);
intr_thd_fixup(it);
}
}
#endif
setrunqueue(td);
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR2(KTR_LOCK,
"_mtx_unlock_sleep: %p switching out lock=%p", m,
(void *)m->mtx_lock);
td->td_proc->p_stats->p_ru.ru_nivcsw++;
mi_switch();
if (LOCK_LOG_TEST(&m->mtx_object, opts))
CTR2(KTR_LOCK, "_mtx_unlock_sleep: %p resuming lock=%p",
m, (void *)m->mtx_lock);
}
mtx_unlock_spin(&sched_lock);
return;
}
/*
* All the unlocking of MTX_SPIN locks is done inline.
* See the _rel_spin_lock() macro for the details.
*/
/*
* The backing function for the INVARIANTS-enabled mtx_assert()
*/
#ifdef INVARIANT_SUPPORT
void
_mtx_assert(struct mtx *m, int what, const char *file, int line)
{
if (panicstr != NULL)
return;
switch (what) {
case MA_OWNED:
case MA_OWNED | MA_RECURSED:
case MA_OWNED | MA_NOTRECURSED:
if (!mtx_owned(m))
panic("mutex %s not owned at %s:%d",
m->mtx_object.lo_name, file, line);
if (mtx_recursed(m)) {
if ((what & MA_NOTRECURSED) != 0)
panic("mutex %s recursed at %s:%d",
m->mtx_object.lo_name, file, line);
} else if ((what & MA_RECURSED) != 0) {
panic("mutex %s unrecursed at %s:%d",
m->mtx_object.lo_name, file, line);
}
break;
case MA_NOTOWNED:
if (mtx_owned(m))
panic("mutex %s owned at %s:%d",
m->mtx_object.lo_name, file, line);
break;
default:
panic("unknown mtx_assert at %s:%d", file, line);
}
}
#endif
/*
* The MUTEX_DEBUG-enabled mtx_validate()
*
* Most of these checks have been moved off into the LO_INITIALIZED flag
* maintained by the witness code.
*/
#ifdef MUTEX_DEBUG
void mtx_validate __P((struct mtx *));
void
mtx_validate(struct mtx *m)
{
/*
* XXX - When kernacc() is fixed on the alpha to handle K0_SEG memory properly
* we can re-enable the kernacc() checks.
*/
#ifndef __alpha__
/*
* Can't call kernacc() from early init386(), especially when
* initializing Giant mutex, because some stuff in kernacc()
* requires Giant itself.
*/
if (!cold)
if (!kernacc((caddr_t)m, sizeof(m),
VM_PROT_READ | VM_PROT_WRITE))
panic("Can't read and write to mutex %p", m);
#endif
}
#endif
/*
* Mutex initialization routine; initialize lock `m' of type contained in
* `opts' with options contained in `opts' and description `description.'
*/
void
mtx_init(struct mtx *m, const char *description, int opts)
{
struct lock_object *lock;
MPASS((opts & ~(MTX_SPIN | MTX_QUIET | MTX_RECURSE |
MTX_SLEEPABLE | MTX_NOWITNESS)) == 0);
#ifdef MUTEX_DEBUG
/* Diagnostic and error correction */
mtx_validate(m);
#endif
lock = &m->mtx_object;
KASSERT((lock->lo_flags & LO_INITIALIZED) == 0,
("mutex %s %p already initialized", description, m));
bzero(m, sizeof(*m));
if (opts & MTX_SPIN)
lock->lo_class = &lock_class_mtx_spin;
else
lock->lo_class = &lock_class_mtx_sleep;
lock->lo_name = description;
if (opts & MTX_QUIET)
lock->lo_flags = LO_QUIET;
if (opts & MTX_RECURSE)
lock->lo_flags |= LO_RECURSABLE;
if (opts & MTX_SLEEPABLE)
lock->lo_flags |= LO_SLEEPABLE;
if ((opts & MTX_NOWITNESS) == 0)
lock->lo_flags |= LO_WITNESS;
m->mtx_lock = MTX_UNOWNED;
TAILQ_INIT(&m->mtx_blocked);
LOCK_LOG_INIT(lock, opts);
WITNESS_INIT(lock);
}
/*
* Remove lock `m' from all_mtx queue. We don't allow MTX_QUIET to be
* passed in as a flag here because if the corresponding mtx_init() was
* called with MTX_QUIET set, then it will already be set in the mutex's
* flags.
*/
void
mtx_destroy(struct mtx *m)
{
LOCK_LOG_DESTROY(&m->mtx_object, 0);
if (!mtx_owned(m))
MPASS(mtx_unowned(m));
else {
MPASS((m->mtx_lock & (MTX_RECURSED|MTX_CONTESTED)) == 0);
/* Tell witness this isn't locked to make it happy. */
WITNESS_UNLOCK(&m->mtx_object, LOP_EXCLUSIVE | LOP_NOSWITCH,
__FILE__, __LINE__);
}
WITNESS_DESTROY(&m->mtx_object);
}
/*
* Encapsulated Giant mutex routines. These routines provide encapsulation
* control for the Giant mutex, allowing sysctls to be used to turn on and
* off Giant around certain subsystems. The default value for the sysctls
* are set to what developers believe is stable and working in regards to
* the Giant pushdown. Developers should not turn off Giant via these
* sysctls unless they know what they are doing.
*
* Callers of mtx_lock_giant() are expected to pass the return value to an
* accompanying mtx_unlock_giant() later on. If multiple subsystems are
* effected by a Giant wrap, all related sysctl variables must be zero for
* the subsystem call to operate without Giant (as determined by the caller).
*/
SYSCTL_NODE(_kern, OID_AUTO, giant, CTLFLAG_RD, NULL, "Giant mutex manipulation");
static int kern_giant_all = 0;
SYSCTL_INT(_kern_giant, OID_AUTO, all, CTLFLAG_RW, &kern_giant_all, 0, "");
int kern_giant_proc = 1; /* Giant around PROC locks */
int kern_giant_file = 1; /* Giant around struct file & filedesc */
SYSCTL_INT(_kern_giant, OID_AUTO, proc, CTLFLAG_RW, &kern_giant_proc, 0, "");
SYSCTL_INT(_kern_giant, OID_AUTO, file, CTLFLAG_RW, &kern_giant_file, 0, "");
int
mtx_lock_giant(int sysctlvar)
{
if (sysctlvar || kern_giant_all) {
mtx_lock(&Giant);
return(1);
}
return(0);
}
void
mtx_unlock_giant(int s)
{
if (s)
mtx_unlock(&Giant);
}