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Provide correct kthread API semantics using pthreads. 

The intent here is to fully remove the previous Solaris thread
implementation so we don't need to simulate both Solaris kernel
and user space thread APIs.  The few user space consumers of the
thread API have been updated to use the kthread API.  In order
to support this we needed to more fully support the kthread API
and that means not doing crazy things like casting a thread id
to a pointer and using that as was done before.  This first
implementation is not effecient but it does provide all the
corrent semantics.  If/when performance becomes and issue we
can and should just natively adopt pthreads which is portable.

Let me finish by saying I'm not proud of any of this and I would
love to see it improved.  However, this slow implementation does
at least provide all the correct kthread API semantics whereas
the previous method of casting the thread ID to a pointer was
dodgy at best.
This commit is contained in:
Brian Behlendorf 2009-07-14 14:16:26 -07:00
parent 57ae3b59e9
commit 864e44e7e0
5 changed files with 236 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
cmd/ztest/ztest.c
View File

@ -141,6 +141,7 @@ typedef struct ztest_args {
objset_t *za_os;
zilog_t *za_zilog;
kthread_t *za_thread;
kt_did_t za_threadid;
uint64_t za_instance;
uint64_t za_random;
uint64_t za_diroff;
@ -3806,6 +3807,8 @@ ztest_resume_thread(void *arg)
(void) poll(NULL, 0, 1000);
ztest_resume(spa);
}
thread_exit();
return (NULL);
}
@ -3870,6 +3873,7 @@ ztest_thread(void *arg)
break;
}
thread_exit();
return (NULL);
}
@ -3885,6 +3889,7 @@ ztest_run(char *pool)
spa_t *spa;
char name[100];
kthread_t *resume_thread;
kt_did_t resume_id;
ztest_exiting = B_FALSE;
@ -3963,8 +3968,9 @@ ztest_run(char *pool)
/*
* Create a thread to periodically resume suspended I/O.
*/
resume_thread = thread_create(NULL, 0, ztest_resume_thread, spa,
THR_BOUND, NULL, 0, 0);
VERIFY3P((resume_thread = thread_create(NULL, 0, ztest_resume_thread,
spa, THR_BOUND, NULL, 0, 0)), !=, NULL);
resume_id = resume_thread->t_tid;
/*
* Verify that we can safely inquire about about any object,
@ -4040,12 +4046,13 @@ ztest_run(char *pool)
za[d].za_zilog = zil_open(za[d].za_os, NULL);
}
za[t].za_thread = thread_create(NULL, 0, ztest_thread, &za[t],
THR_BOUND, NULL, 0, 0);
VERIFY3P((za[t].za_thread = thread_create(NULL, 0, ztest_thread,
&za[t], THR_BOUND, NULL, 0, 0)), !=, NULL);
za[t].za_threadid = za[t].za_thread->t_tid;
}
while (--t >= 0) {
VERIFY(thr_join(za[t].za_thread, NULL, NULL) == 0);
VERIFY(thread_join(za[t].za_threadid, NULL, NULL) == 0);
if (t < zopt_datasets) {
zil_close(za[t].za_zilog);
dmu_objset_close(za[t].za_os);
@ -4084,7 +4091,7 @@ ztest_run(char *pool)
/* Kill the resume thread */
ztest_exiting = B_TRUE;
VERIFY(thr_join(resume_thread, NULL, NULL) == 0);
VERIFY(thread_join(resume_id, NULL, NULL) == 0);
ztest_resume(spa);
/*

35
lib/libzpool/include/sys/zfs_context.h
View File

@ -192,24 +192,34 @@ _NOTE(CONSTCOND) } while (0)
/*
* Threads
*/
#define tsd_get(key) pthread_getspecific(key)
#define tsd_set(key, val) pthread_setspecific(key, val)
#define THR_BOUND 0x00000001
#define TS_RUN 0x00000002
typedef void (*thread_func_t)(void *);
typedef pthread_t kt_did_t;
typedef struct kthread {
list_node_t t_node;
pthread_t t_id;
kt_did_t t_tid;
pthread_attr_t t_attr;
} kthread_t;
#define curthread zk_curthread()
#define thread_create(stk, stksize, func, arg, len, pp, state, pri) \
zk_thread_create((thread_func_t)func, arg)
#define thr_join(kt, v1, v2) pthread_join(kt->t_id, v2)
#define tsd_get(key) pthread_getspecific(key)
#define tsd_set(key, val) pthread_setspecific(key, val)
#define curthread zk_thread_current()
#define thread_exit zk_thread_exit
#define thread_create(stk, stksize, func, arg, len, pp, state, pri) \
zk_thread_create(stk, stksize, (thread_func_t)func, arg, \
len, NULL, state, pri)
#define thread_join(tid, dtid, status) \
zk_thread_join(tid, dtid, status)
extern kthread_t *zk_curthread(void);
extern kthread_t *zk_thread_create(thread_func_t func, void *arg);
extern void thread_exit(void);
extern kthread_t *zk_thread_current(void);
extern void zk_thread_exit(void);
extern kthread_t *zk_thread_create(caddr_t stk, size_t stksize,
thread_func_t func, void *arg, size_t len,
void *pp, int state, pri_t pri);
extern int zk_thread_join(kt_did_t tid, kthread_t *dtid, void **status);
#define issig(why) (FALSE)
#define ISSIG(thr, why) (FALSE)
@ -218,6 +228,8 @@ extern void thread_exit(void);
* Mutexes
*/
#define MTX_MAGIC 0x9522f51362a6e326ull
#define MTX_INIT (void *)NULL
#define MTX_DEST (void *)-1UL
typedef struct kmutex {
void *m_owner;
uint64_t m_magic;
@ -238,6 +250,8 @@ extern void *mutex_owner(kmutex_t *mp);
* RW locks
*/
#define RW_MAGIC 0x4d31fb123648e78aull
#define RW_INIT (void *)NULL
#define RW_DEST (void *)-1UL
typedef struct krwlock {
void *rw_owner;
void *rw_wr_owner;
@ -339,6 +353,7 @@ extern void taskq_destroy(taskq_t *);
extern void taskq_wait(taskq_t *);
extern int taskq_member(taskq_t *, void *);
extern void system_taskq_init(void);
extern void system_taskq_fini(void);
#define XVA_MAPSIZE 3
#define XVA_MAGIC 0x78766174

265
lib/libzpool/kernel.c
View File

@ -30,6 +30,7 @@
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include <sys/signal.h>
#include <sys/spa.h>
#include <sys/stat.h>
#include <sys/processor.h>
@ -57,64 +58,157 @@ struct utsname utsname = {
* =========================================================================
*/
kmutex_t kthread_lock;
/* NOTE: Tracking each tid on a list and using it for curthread lookups
* is slow at best but it provides an easy way to provide a kthread
* style API on top of pthreads. For now we just want ztest to work
* to validate correctness. Performance is not much of an issue
* since that is what the in-kernel version is for. That said
* reworking this to track the kthread_t structure as thread
* specific data would be probably the best way to speed this up.
*/
pthread_cond_t kthread_cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t kthread_lock = PTHREAD_MUTEX_INITIALIZER;
list_t kthread_list;
kthread_t *
zk_curthread(void)
static int
thread_count(void)
{
kthread_t *kt;
pthread_t tid;
int count = 0;
tid = pthread_self();
mutex_enter(&kthread_lock);
for (kt = list_head(&kthread_list); kt != NULL;
kt = list_next(&kthread_list, kt)) {
for (kt = list_head(&kthread_list); kt != NULL;
kt = list_next(&kthread_list, kt))
count++;
if (kt->t_id == tid) {
mutex_exit(&kthread_lock);
return kt;
}
}
mutex_exit(&kthread_lock);
return NULL;
return count;
}
kthread_t *
zk_thread_create(thread_func_t func, void *arg)
static void
thread_init(void)
{
kthread_t *kt;
/* Initialize list for tracking kthreads */
list_create(&kthread_list, sizeof (kthread_t),
offsetof(kthread_t, t_node));
/* Create entry for primary kthread */
kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
VERIFY(pthread_attr_init(&kt->t_attr) == 0);
VERIFY(pthread_attr_setdetachstate(&kt->t_attr,
PTHREAD_CREATE_DETACHED) == 0);
VERIFY(pthread_create(&kt->t_id, &kt->t_attr,
(void *(*)(void *))func, arg) == 0);
mutex_enter(&kthread_lock);
list_link_init(&kt->t_node);
VERIFY3U(kt->t_tid = pthread_self(), !=, 0);
VERIFY3S(pthread_attr_init(&kt->t_attr), ==, 0);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
list_insert_head(&kthread_list, kt);
mutex_exit(&kthread_lock);
return kt;
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
}
void
thread_exit(void)
static void
thread_fini(void)
{
kthread_t *kt;
struct timespec ts = { 0 };
int count;
VERIFY((kt = curthread) != NULL);
/* Wait for all threads to exit via thread_exit() */
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
while ((count = thread_count()) > 1) {
printf("Waiting for %d\n", count);
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += 1;
pthread_cond_timedwait(&kthread_cond, &kthread_lock, &ts);
}
mutex_enter(&kthread_lock);
ASSERT3S(thread_count(), ==, 1);
kt = list_head(&kthread_list);
list_remove(&kthread_list, kt);
mutex_exit(&kthread_lock);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
VERIFY(pthread_attr_destroy(&kt->t_attr) == 0);
umem_free(kt, sizeof(kthread_t));
/* Cleanup list for tracking kthreads */
list_destroy(&kthread_list);
}
kthread_t *
zk_thread_current(void)
{
kt_did_t tid = pthread_self();
kthread_t *kt;
int count = 1;
/*
* Because a newly created thread may call zk_thread_current()
* before the thread parent has had time to add the thread's tid
* to our lookup list. We will loop as long as there are tid
* which have not yet been set which must be one of ours.
* Yes it's a hack, at some point we can just use native pthreads.
*/
while (count > 0) {
count = 0;
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
for (kt = list_head(&kthread_list); kt != NULL;
kt = list_next(&kthread_list, kt)) {
if (kt->t_tid == tid) {
VERIFY3S(pthread_mutex_unlock(
&kthread_lock), ==, 0);
return kt;
}
if (kt->t_tid == (kt_did_t)-1)
count++;
}
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
}
/* Unreachable */
ASSERT(0);
return NULL;
}
kthread_t *
zk_thread_create(caddr_t stk, size_t stksize, thread_func_t func, void *arg,
size_t len, void *pp, int state, pri_t pri)
{
kthread_t *kt;
kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
kt->t_tid = (kt_did_t)-1;
list_link_init(&kt->t_node);
VERIFY(pthread_attr_init(&kt->t_attr) == 0);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
list_insert_head(&kthread_list, kt);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
VERIFY(pthread_create(&kt->t_tid, &kt->t_attr,
(void *(*)(void *))func, arg) == 0);
return kt;
}
int
zk_thread_join(kt_did_t tid, kthread_t *dtid, void **status)
{
return pthread_join(tid, status);
}
void
zk_thread_exit(void)
{
kthread_t *kt;
VERIFY3P(kt = curthread, !=, NULL);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
list_remove(&kthread_list, kt);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
VERIFY(pthread_attr_destroy(&kt->t_attr) == 0);
umem_free(kt, sizeof(kthread_t));
pthread_cond_broadcast(&kthread_cond);
pthread_exit(NULL);
}
@ -149,14 +243,14 @@ kstat_delete(kstat_t *ksp)
void
mutex_init(kmutex_t *mp, char *name, int type, void *cookie)
{
ASSERT(type == MUTEX_DEFAULT);
ASSERT(cookie == NULL);
ASSERT3S(type, ==, MUTEX_DEFAULT);
ASSERT3P(cookie, ==, NULL);
#ifdef IM_FEELING_LUCKY
ASSERT(mp->m_magic != MTX_MAGIC);
ASSERT3U(mp->m_magic, !=, MTX_MAGIC);
#endif
mp->m_owner = NULL;
mp->m_owner = MTX_INIT;
mp->m_magic = MTX_MAGIC;
VERIFY3S(pthread_mutex_init(&mp->m_lock, NULL), ==, 0);
}
@ -164,31 +258,31 @@ mutex_init(kmutex_t *mp, char *name, int type, void *cookie)
void
mutex_destroy(kmutex_t *mp)
{
ASSERT(mp->m_magic == MTX_MAGIC);
ASSERT(mp->m_owner == NULL);
ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
ASSERT3P(mp->m_owner, ==, MTX_INIT);
VERIFY3S(pthread_mutex_destroy(&(mp)->m_lock), ==, 0);
mp->m_owner = (void *)-1UL;
mp->m_owner = MTX_DEST;
mp->m_magic = 0;
}
void
mutex_enter(kmutex_t *mp)
{
ASSERT(mp->m_magic == MTX_MAGIC);
ASSERT(mp->m_owner != (void *)-1UL);
ASSERT(mp->m_owner != curthread);
ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
ASSERT3P(mp->m_owner, !=, MTX_DEST);
ASSERT3P(mp->m_owner, !=, curthread);
VERIFY3S(pthread_mutex_lock(&mp->m_lock), ==, 0);
ASSERT(mp->m_owner == NULL);
ASSERT3P(mp->m_owner, ==, MTX_INIT);
mp->m_owner = curthread;
}
int
mutex_tryenter(kmutex_t *mp)
{
ASSERT(mp->m_magic == MTX_MAGIC);
ASSERT(mp->m_owner != (void *)-1UL);
ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
ASSERT3P(mp->m_owner, !=, MTX_DEST);
if (0 == pthread_mutex_trylock(&mp->m_lock)) {
ASSERT(mp->m_owner == NULL);
ASSERT3P(mp->m_owner, ==, MTX_INIT);
mp->m_owner = curthread;
return (1);
} else {
@ -199,16 +293,16 @@ mutex_tryenter(kmutex_t *mp)
void
mutex_exit(kmutex_t *mp)
{
ASSERT(mp->m_magic == MTX_MAGIC);
ASSERT(mutex_owner(mp) == curthread);
mp->m_owner = NULL;
ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
ASSERT3P(mutex_owner(mp), ==, curthread);
mp->m_owner = MTX_INIT;
VERIFY3S(pthread_mutex_unlock(&mp->m_lock), ==, 0);
}
void *
mutex_owner(kmutex_t *mp)
{
ASSERT(mp->m_magic == MTX_MAGIC);
ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
return (mp->m_owner);
}
@ -221,16 +315,16 @@ mutex_owner(kmutex_t *mp)
void
rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
{
ASSERT(type == RW_DEFAULT);
ASSERT(arg == NULL);
ASSERT3S(type, ==, RW_DEFAULT);
ASSERT3P(arg, ==, NULL);
#ifdef IM_FEELING_LUCKY
ASSERT(rwlp->rw_magic != RW_MAGIC);
ASSERT3U(rwlp->rw_magic, !=, RW_MAGIC);
#endif
VERIFY3S(pthread_rwlock_init(&rwlp->rw_lock, NULL), ==, 0);
rwlp->rw_owner = NULL;
rwlp->rw_wr_owner = NULL;
rwlp->rw_owner = RW_INIT;
rwlp->rw_wr_owner = RW_INIT;
rwlp->rw_readers = 0;
rwlp->rw_magic = RW_MAGIC;
}
@ -238,7 +332,7 @@ rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
void
rw_destroy(krwlock_t *rwlp)
{
ASSERT(rwlp->rw_magic == RW_MAGIC);
ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
VERIFY3S(pthread_rwlock_destroy(&rwlp->rw_lock), ==, 0);
rwlp->rw_magic = 0;
@ -247,18 +341,18 @@ rw_destroy(krwlock_t *rwlp)
void
rw_enter(krwlock_t *rwlp, krw_t rw)
{
ASSERT(rwlp->rw_magic == RW_MAGIC);
ASSERT(rwlp->rw_owner != curthread);
ASSERT(rwlp->rw_wr_owner != curthread);
ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
ASSERT3P(rwlp->rw_owner, !=, curthread);
ASSERT3P(rwlp->rw_wr_owner, !=, curthread);
if (rw == RW_READER) {
VERIFY3S(pthread_rwlock_rdlock(&rwlp->rw_lock), ==, 0);
ASSERT(rwlp->rw_wr_owner == NULL);
ASSERT3P(rwlp->rw_wr_owner, ==, RW_INIT);
atomic_inc_uint(&rwlp->rw_readers);
} else {
VERIFY3S(pthread_rwlock_wrlock(&rwlp->rw_lock), ==, 0);
ASSERT(rwlp->rw_wr_owner == NULL);
ASSERT3P(rwlp->rw_wr_owner, ==, RW_INIT);
ASSERT3U(rwlp->rw_readers, ==, 0);
rwlp->rw_wr_owner = curthread;
@ -270,15 +364,15 @@ rw_enter(krwlock_t *rwlp, krw_t rw)
void
rw_exit(krwlock_t *rwlp)
{
ASSERT(rwlp->rw_magic == RW_MAGIC);
ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
ASSERT(RW_LOCK_HELD(rwlp));
if (RW_READ_HELD(rwlp))
atomic_dec_uint(&rwlp->rw_readers);
else
rwlp->rw_wr_owner = NULL;
rwlp->rw_wr_owner = RW_INIT;
rwlp->rw_owner = NULL;
rwlp->rw_owner = RW_INIT;
VERIFY3S(pthread_rwlock_unlock(&rwlp->rw_lock), ==, 0);
}
@ -287,7 +381,7 @@ rw_tryenter(krwlock_t *rwlp, krw_t rw)
{
int rv;
ASSERT(rwlp->rw_magic == RW_MAGIC);
ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
if (rw == RW_READER)
rv = pthread_rwlock_tryrdlock(&rwlp->rw_lock);
@ -295,7 +389,7 @@ rw_tryenter(krwlock_t *rwlp, krw_t rw)
rv = pthread_rwlock_trywrlock(&rwlp->rw_lock);
if (rv == 0) {
ASSERT(rwlp->rw_wr_owner == NULL);
ASSERT3P(rwlp->rw_wr_owner, ==, RW_INIT);
if (rw == RW_READER)
atomic_inc_uint(&rwlp->rw_readers);
@ -317,7 +411,7 @@ rw_tryenter(krwlock_t *rwlp, krw_t rw)
int
rw_tryupgrade(krwlock_t *rwlp)
{
ASSERT(rwlp->rw_magic == RW_MAGIC);
ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
return (0);
}
@ -331,10 +425,10 @@ rw_tryupgrade(krwlock_t *rwlp)
void
cv_init(kcondvar_t *cv, char *name, int type, void *arg)
{
ASSERT(type == CV_DEFAULT);
ASSERT3S(type, ==, CV_DEFAULT);
#ifdef IM_FEELING_LUCKY
ASSERT(cv->cv_magic != CV_MAGIC);
ASSERT3U(cv->cv_magic, !=, CV_MAGIC);
#endif
cv->cv_magic = CV_MAGIC;
@ -345,7 +439,7 @@ cv_init(kcondvar_t *cv, char *name, int type, void *arg)
void
cv_destroy(kcondvar_t *cv)
{
ASSERT(cv->cv_magic == CV_MAGIC);
ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
VERIFY3S(pthread_cond_destroy(&cv->cv), ==, 0);
cv->cv_magic = 0;
}
@ -353,9 +447,9 @@ cv_destroy(kcondvar_t *cv)
void
cv_wait(kcondvar_t *cv, kmutex_t *mp)
{
ASSERT(cv->cv_magic == CV_MAGIC);
ASSERT(mutex_owner(mp) == curthread);
mp->m_owner = NULL;
ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
ASSERT3P(mutex_owner(mp), ==, curthread);
mp->m_owner = MTX_INIT;
int ret = pthread_cond_wait(&cv->cv, &mp->m_lock);
if (ret != 0)
VERIFY3S(ret, ==, EINTR);
@ -370,7 +464,7 @@ cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
timestruc_t ts;
clock_t delta;
ASSERT(cv->cv_magic == CV_MAGIC);
ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
top:
delta = abstime - lbolt;
@ -386,8 +480,8 @@ top:
ts.tv_nsec -= NANOSEC;
}
ASSERT(mutex_owner(mp) == curthread);
mp->m_owner = NULL;
ASSERT3P(mutex_owner(mp), ==, curthread);
mp->m_owner = MTX_INIT;
error = pthread_cond_timedwait(&cv->cv, &mp->m_lock, &ts);
mp->m_owner = curthread;
@ -405,14 +499,14 @@ top:
void
cv_signal(kcondvar_t *cv)
{
ASSERT(cv->cv_magic == CV_MAGIC);
ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
VERIFY3S(pthread_cond_signal(&cv->cv), ==, 0);
}
void
cv_broadcast(kcondvar_t *cv)
{
ASSERT(cv->cv_magic == CV_MAGIC);
ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
VERIFY3S(pthread_cond_broadcast(&cv->cv), ==, 0);
}
@ -896,12 +990,8 @@ kernel_init(int mode)
VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
mutex_init(&kthread_lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&kthread_list, sizeof (kthread_t),
offsetof(kthread_t, t_node));
thread_init();
system_taskq_init();
spa_init(mode);
}
@ -909,9 +999,8 @@ void
kernel_fini(void)
{
spa_fini();
list_destroy(&kthread_list);
mutex_destroy(&kthread_lock);
system_taskq_fini();
thread_fini();
close(random_fd);
close(urandom_fd);

20
lib/libzpool/taskq.c
View File

@ -43,6 +43,7 @@ struct taskq {
kcondvar_t tq_dispatch_cv;
kcondvar_t tq_wait_cv;
kthread_t **tq_threadlist;
kt_did_t *tq_idlist;
int tq_flags;
int tq_active;
int tq_nthreads;
@ -163,6 +164,7 @@ taskq_thread(void *arg)
tq->tq_nthreads--;
cv_broadcast(&tq->tq_wait_cv);
mutex_exit(&tq->tq_lock);
thread_exit();
return (NULL);
}
@ -198,7 +200,10 @@ taskq_create(const char *name, int nthreads, pri_t pri,
tq->tq_maxalloc = maxalloc;
tq->tq_task.task_next = &tq->tq_task;
tq->tq_task.task_prev = &tq->tq_task;
tq->tq_threadlist = kmem_alloc(nthreads*sizeof(kthread_t *), KM_SLEEP);
VERIFY3P((tq->tq_threadlist = kmem_alloc(tq->tq_nthreads *
sizeof(kthread_t *), KM_SLEEP)), !=, NULL);
VERIFY3P((tq->tq_idlist = kmem_alloc(tq->tq_nthreads *
sizeof(kt_did_t), KM_SLEEP)), !=, NULL);
if (flags & TASKQ_PREPOPULATE) {
mutex_enter(&tq->tq_lock);
@ -207,9 +212,11 @@ taskq_create(const char *name, int nthreads, pri_t pri,
mutex_exit(&tq->tq_lock);
}
for (t = 0; t < nthreads; t++)
for (t = 0; t < tq->tq_nthreads; t++) {
VERIFY((tq->tq_threadlist[t] = thread_create(NULL, 0,
taskq_thread, tq, THR_BOUND, NULL, 0, 0)) != NULL);
tq->tq_idlist[t] = tq->tq_threadlist[t]->t_tid;
}
return (tq);
}
@ -239,9 +246,10 @@ taskq_destroy(taskq_t *tq)
mutex_exit(&tq->tq_lock);
for (t = 0; t < nthreads; t++)
(void) thr_join(tq->tq_threadlist[t], NULL, NULL);
VERIFY3S(thread_join(tq->tq_idlist[t], NULL, NULL), ==, 0);
kmem_free(tq->tq_threadlist, nthreads * sizeof(kthread_t *));
kmem_free(tq->tq_idlist, nthreads * sizeof(kt_did_t));
rw_destroy(&tq->tq_threadlock);
mutex_destroy(&tq->tq_lock);
@ -272,3 +280,9 @@ system_taskq_init(void)
system_taskq = taskq_create("system_taskq", 64, minclsyspri, 4, 512,
TASKQ_DYNAMIC | TASKQ_PREPOPULATE);
}
void
system_taskq_fini(void)
{
taskq_destroy(system_taskq);
}

4
module/zfs/txg.c
View File

@ -446,6 +446,8 @@ txg_sync_thread(dsl_pool_t *dp)
rw_exit(&tx->tx_suspend);
cv_broadcast(&tx->tx_sync_done_cv);
}
thread_exit();
}
static void
@ -490,6 +492,8 @@ txg_quiesce_thread(dsl_pool_t *dp)
cv_broadcast(&tx->tx_sync_more_cv);
cv_broadcast(&tx->tx_quiesce_done_cv);
}
thread_exit();
}
/*