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MFp4:

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- Add flags CVWAIT_ABSTIME and CVWAIT_CLOCKID for umtx kernel based
  condition variable, this should eliminate an extra system call to get
  current time.

- Add sub-function UMTX_OP_NWAKE_PRIVATE to wake up N channels in single
  system call. Create userland sleep queue for condition variable, in most
  cases, thread will wait in the queue, the pthread_cond_signal will defer
  thread wakeup until the mutex is unlocked, it tries to avoid an extra
  system call and a extra context switch in time window of pthread_cond_signal
  and pthread_mutex_unlock.

The changes are part of process-shared mutex project.
This commit is contained in:
David Xu 2010-12-22 05:01:52 +00:00
parent e6c006d96a
commit d1078b0b03
12 changed files with 783 additions and 212 deletions
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1
lib/libthr/thread/Makefile.inc
View File

@ -45,6 +45,7 @@ SRCS+= \
thr_setschedparam.c \
thr_sig.c \
thr_single_np.c \
thr_sleepq.c \
thr_spec.c \
thr_spinlock.c \
thr_stack.c \

379
lib/libthr/thread/thr_cond.c
View File

@ -45,7 +45,8 @@ int __pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
static int cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr);
static int cond_wait_common(pthread_cond_t *cond, pthread_mutex_t *mutex,
const struct timespec *abstime, int cancel);
static int cond_signal_common(pthread_cond_t *cond, int broadcast);
static int cond_signal_common(pthread_cond_t *cond);
static int cond_broadcast_common(pthread_cond_t *cond);
/*
* Double underscore versions are cancellation points. Single underscore
@ -60,31 +61,31 @@ __weak_reference(_pthread_cond_destroy, pthread_cond_destroy);
__weak_reference(_pthread_cond_signal, pthread_cond_signal);
__weak_reference(_pthread_cond_broadcast, pthread_cond_broadcast);
#define CV_PSHARED(cvp) (((cvp)->__flags & USYNC_PROCESS_SHARED) != 0)
static int
cond_init(pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
{
pthread_cond_t pcond;
int rval = 0;
struct pthread_cond *cvp;
int error = 0;
if ((pcond = (pthread_cond_t)
if ((cvp = (pthread_cond_t)
calloc(1, sizeof(struct pthread_cond))) == NULL) {
rval = ENOMEM;
error = ENOMEM;
} else {
/*
* Initialise the condition variable structure:
*/
if (cond_attr == NULL || *cond_attr == NULL) {
pcond->c_pshared = 0;
pcond->c_clockid = CLOCK_REALTIME;
cvp->__clock_id = CLOCK_REALTIME;
} else {
pcond->c_pshared = (*cond_attr)->c_pshared;
pcond->c_clockid = (*cond_attr)->c_clockid;
if ((*cond_attr)->c_pshared)
cvp->__flags |= USYNC_PROCESS_SHARED;
cvp->__clock_id = (*cond_attr)->c_clockid;
}
_thr_umutex_init(&pcond->c_lock);
*cond = pcond;
*cond = cvp;
}
/* Return the completion status: */
return (rval);
return (error);
}
static int
@ -105,16 +106,16 @@ init_static(struct pthread *thread, pthread_cond_t *cond)
}
#define CHECK_AND_INIT_COND \
if (__predict_false((cv = (*cond)) <= THR_COND_DESTROYED)) { \
if (cv == THR_COND_INITIALIZER) { \
if (__predict_false((cvp = (*cond)) <= THR_COND_DESTROYED)) { \
if (cvp == THR_COND_INITIALIZER) { \
int ret; \
ret = init_static(_get_curthread(), cond); \
if (ret) \
return (ret); \
} else if (cv == THR_COND_DESTROYED) { \
} else if (cvp == THR_COND_DESTROYED) { \
return (EINVAL); \
} \
cv = *cond; \
cvp = *cond; \
}
int
@ -128,48 +129,24 @@ _pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
int
_pthread_cond_destroy(pthread_cond_t *cond)
{
struct pthread *curthread = _get_curthread();
struct pthread_cond *cv;
int rval = 0;
struct pthread_cond *cvp;
int error = 0;
if ((cv = *cond) == THR_COND_INITIALIZER)
rval = 0;
else if (cv == THR_COND_DESTROYED)
rval = EINVAL;
if ((cvp = *cond) == THR_COND_INITIALIZER)
error = 0;
else if (cvp == THR_COND_DESTROYED)
error = EINVAL;
else {
cv = *cond;
THR_UMUTEX_LOCK(curthread, &cv->c_lock);
cvp = *cond;
*cond = THR_COND_DESTROYED;
THR_UMUTEX_UNLOCK(curthread, &cv->c_lock);
/*
* Free the memory allocated for the condition
* variable structure:
*/
free(cv);
free(cvp);
}
return (rval);
}
struct cond_cancel_info
{
pthread_mutex_t *mutex;
pthread_cond_t *cond;
int count;
};
static void
cond_cancel_handler(void *arg)
{
struct pthread *curthread = _get_curthread();
struct cond_cancel_info *info = (struct cond_cancel_info *)arg;
pthread_cond_t cv;
if (info->cond != NULL) {
cv = *(info->cond);
THR_UMUTEX_UNLOCK(curthread, &cv->c_lock);
}
_mutex_cv_lock(info->mutex, info->count);
return (error);
}
/*
@ -180,54 +157,152 @@ cond_cancel_handler(void *arg)
* Thread cancellation never cause wakeup from pthread_cond_signal()
* to be lost.
*/
static int
cond_wait_kernel(struct pthread_cond *cvp, struct pthread_mutex *mp,
const struct timespec *abstime, int cancel)
{
struct pthread *curthread = _get_curthread();
int recurse;
int error, error2 = 0;
error = _mutex_cv_detach(mp, &recurse);
if (error != 0)
return (error);
if (cancel) {
_thr_cancel_enter2(curthread, 0);
error = _thr_ucond_wait((struct ucond *)&cvp->__has_kern_waiters,
(struct umutex *)&mp->m_lock, abstime,
CVWAIT_ABSTIME|CVWAIT_CLOCKID);
_thr_cancel_leave(curthread, 0);
} else {
error = _thr_ucond_wait((struct ucond *)&cvp->__has_kern_waiters,
(struct umutex *)&mp->m_lock, abstime,
CVWAIT_ABSTIME|CVWAIT_CLOCKID);
}
/*
* Note that PP mutex and ROBUST mutex may return
* interesting error codes.
*/
if (error == 0) {
error2 = _mutex_cv_lock(mp, recurse);
} else if (error == EINTR || error == ETIMEDOUT) {
error2 = _mutex_cv_lock(mp, recurse);
if (error2 == 0 && cancel)
_thr_testcancel(curthread);
if (error == EINTR)
error = 0;
} else {
/* We know that it didn't unlock the mutex. */
error2 = _mutex_cv_attach(mp, recurse);
if (error2 == 0 && cancel)
_thr_testcancel(curthread);
}
return (error2 != 0 ? error2 : error);
}
/*
* Thread waits in userland queue whenever possible, when thread
* is signaled or broadcasted, it is removed from the queue, and
* is saved in curthread's defer_waiters[] buffer, but won't be
* woken up until mutex is unlocked.
*/
static int
cond_wait_user(struct pthread_cond *cvp, struct pthread_mutex *mp,
const struct timespec *abstime, int cancel)
{
struct pthread *curthread = _get_curthread();
struct sleepqueue *sq;
int recurse;
int error;
if (curthread->wchan != NULL)
PANIC("thread was already on queue.");
if (cancel)
_thr_testcancel(curthread);
_sleepq_lock(cvp);
/*
* set __has_user_waiters before unlocking mutex, this allows
* us to check it without locking in pthread_cond_signal().
*/
cvp->__has_user_waiters = 1;
curthread->will_sleep = 1;
(void)_mutex_cv_unlock(mp, &recurse);
curthread->mutex_obj = mp;
_sleepq_add(cvp, curthread);
for(;;) {
_thr_clear_wake(curthread);
_sleepq_unlock(cvp);
if (cancel) {
_thr_cancel_enter2(curthread, 0);
error = _thr_sleep(curthread, cvp->__clock_id, abstime);
_thr_cancel_leave(curthread, 0);
} else {
error = _thr_sleep(curthread, cvp->__clock_id, abstime);
}
if (curthread->wchan == NULL) {
error = 0;
goto out;
}
_sleepq_lock(cvp);
if (curthread->wchan == NULL) {
error = 0;
break;
} else if (cancel && SHOULD_CANCEL(curthread)) {
sq = _sleepq_lookup(cvp);
cvp->__has_user_waiters =
_sleepq_remove(sq, curthread);
_sleepq_unlock(cvp);
curthread->mutex_obj = NULL;
_mutex_cv_lock(mp, recurse);
if (!THR_IN_CRITICAL(curthread))
_pthread_exit(PTHREAD_CANCELED);
else /* this should not happen */
return (0);
} else if (error == ETIMEDOUT) {
sq = _sleepq_lookup(cvp);
cvp->__has_user_waiters =
_sleepq_remove(sq, curthread);
break;
}
}
_sleepq_unlock(cvp);
out:
curthread->mutex_obj = NULL;
_mutex_cv_lock(mp, recurse);
return (error);
}
static int
cond_wait_common(pthread_cond_t *cond, pthread_mutex_t *mutex,
const struct timespec *abstime, int cancel)
{
struct pthread *curthread = _get_curthread();
struct timespec ts, ts2, *tsp;
struct cond_cancel_info info;
pthread_cond_t cv;
int ret;
struct pthread_cond *cvp;
struct pthread_mutex *mp;
int error;
/*
* If the condition variable is statically initialized,
* perform the dynamic initialization:
*/
CHECK_AND_INIT_COND
cv = *cond;
THR_UMUTEX_LOCK(curthread, &cv->c_lock);
ret = _mutex_cv_unlock(mutex, &info.count);
if (__predict_false(ret != 0)) {
THR_UMUTEX_UNLOCK(curthread, &cv->c_lock);
return (ret);
}
mp = *mutex;
info.mutex = mutex;
info.cond = cond;
if ((error = _mutex_owned(curthread, mp)) != 0)
return (error);
if (abstime != NULL) {
clock_gettime(cv->c_clockid, &ts);
TIMESPEC_SUB(&ts2, abstime, &ts);
tsp = &ts2;
} else
tsp = NULL;
if (cancel) {
THR_CLEANUP_PUSH(curthread, cond_cancel_handler, &info);
_thr_cancel_enter2(curthread, 0);
ret = _thr_ucond_wait(&cv->c_kerncv, &cv->c_lock, tsp, 1);
info.cond = NULL;
_thr_cancel_leave(curthread, (ret != 0));
THR_CLEANUP_POP(curthread, 0);
} else {
ret = _thr_ucond_wait(&cv->c_kerncv, &cv->c_lock, tsp, 0);
}
if (ret == EINTR)
ret = 0;
_mutex_cv_lock(mutex, info.count);
return (ret);
if (curthread->attr.sched_policy != SCHED_OTHER ||
(mp->m_lock.m_flags & (UMUTEX_PRIO_PROTECT|UMUTEX_PRIO_INHERIT|
USYNC_PROCESS_SHARED)) != 0 ||
(cvp->__flags & USYNC_PROCESS_SHARED) != 0)
return cond_wait_kernel(cvp, mp, abstime, cancel);
else
return cond_wait_user(cvp, mp, abstime, cancel);
}
int
@ -245,7 +320,7 @@ __pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
}
int
_pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
const struct timespec * abstime)
{
@ -269,11 +344,15 @@ __pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
}
static int
cond_signal_common(pthread_cond_t *cond, int broadcast)
cond_signal_common(pthread_cond_t *cond)
{
struct pthread *curthread = _get_curthread();
pthread_cond_t cv;
int ret = 0;
struct pthread *td;
struct pthread_cond *cvp;
struct pthread_mutex *mp;
struct sleepqueue *sq;
int *waddr;
int pshared;
/*
* If the condition variable is statically initialized, perform dynamic
@ -281,25 +360,123 @@ cond_signal_common(pthread_cond_t *cond, int broadcast)
*/
CHECK_AND_INIT_COND
THR_UMUTEX_LOCK(curthread, &cv->c_lock);
if (!broadcast)
ret = _thr_ucond_signal(&cv->c_kerncv);
else
ret = _thr_ucond_broadcast(&cv->c_kerncv);
THR_UMUTEX_UNLOCK(curthread, &cv->c_lock);
return (ret);
pshared = CV_PSHARED(cvp);
_thr_ucond_signal((struct ucond *)&cvp->__has_kern_waiters);
if (pshared || cvp->__has_user_waiters == 0)
return (0);
curthread = _get_curthread();
waddr = NULL;
_sleepq_lock(cvp);
sq = _sleepq_lookup(cvp);
if (sq == NULL) {
_sleepq_unlock(cvp);
return (0);
}
td = _sleepq_first(sq);
mp = td->mutex_obj;
cvp->__has_user_waiters = _sleepq_remove(sq, td);
if (mp->m_owner == curthread) {
if (curthread->nwaiter_defer >= MAX_DEFER_WAITERS) {
_thr_wake_all(curthread->defer_waiters,
curthread->nwaiter_defer);
curthread->nwaiter_defer = 0;
}
curthread->defer_waiters[curthread->nwaiter_defer++] =
&td->wake_addr->value;
mp->m_flags |= PMUTEX_FLAG_DEFERED;
} else {
waddr = &td->wake_addr->value;
}
_sleepq_unlock(cvp);
if (waddr != NULL)
_thr_set_wake(waddr);
return (0);
}
struct broadcast_arg {
struct pthread *curthread;
unsigned int *waddrs[MAX_DEFER_WAITERS];
int count;
};
static void
drop_cb(struct pthread *td, void *arg)
{
struct broadcast_arg *ba = arg;
struct pthread_mutex *mp;
struct pthread *curthread = ba->curthread;
mp = td->mutex_obj;
if (mp->m_owner == curthread) {
if (curthread->nwaiter_defer >= MAX_DEFER_WAITERS) {
_thr_wake_all(curthread->defer_waiters,
curthread->nwaiter_defer);
curthread->nwaiter_defer = 0;
}
curthread->defer_waiters[curthread->nwaiter_defer++] =
&td->wake_addr->value;
mp->m_flags |= PMUTEX_FLAG_DEFERED;
} else {
if (ba->count >= MAX_DEFER_WAITERS) {
_thr_wake_all(ba->waddrs, ba->count);
ba->count = 0;
}
ba->waddrs[ba->count++] = &td->wake_addr->value;
}
}
static int
cond_broadcast_common(pthread_cond_t *cond)
{
int pshared;
struct pthread_cond *cvp;
struct sleepqueue *sq;
struct broadcast_arg ba;
/*
* If the condition variable is statically initialized, perform dynamic
* initialization.
*/
CHECK_AND_INIT_COND
pshared = CV_PSHARED(cvp);
_thr_ucond_broadcast((struct ucond *)&cvp->__has_kern_waiters);
if (pshared || cvp->__has_user_waiters == 0)
return (0);
ba.curthread = _get_curthread();
ba.count = 0;
_sleepq_lock(cvp);
sq = _sleepq_lookup(cvp);
if (sq == NULL) {
_sleepq_unlock(cvp);
return (0);
}
_sleepq_drop(sq, drop_cb, &ba);
cvp->__has_user_waiters = 0;
_sleepq_unlock(cvp);
if (ba.count > 0)
_thr_wake_all(ba.waddrs, ba.count);
return (0);
}
int
_pthread_cond_signal(pthread_cond_t * cond)
{
return (cond_signal_common(cond, 0));
return (cond_signal_common(cond));
}
int
_pthread_cond_broadcast(pthread_cond_t * cond)
{
return (cond_signal_common(cond, 1));
return (cond_broadcast_common(cond));
}

2
lib/libthr/thread/thr_init.c
View File

@ -444,6 +444,8 @@ init_private(void)
_thr_once_init();
_thr_spinlock_init();
_thr_list_init();
_thr_wake_addr_init();
_sleepq_init();
/*
* Avoid reinitializing some things if they don't need to be,

92
lib/libthr/thread/thr_kern.c
View File

@ -30,6 +30,7 @@
#include <sys/types.h>
#include <sys/signalvar.h>
#include <sys/rtprio.h>
#include <sys/mman.h>
#include <pthread.h>
#include "thr_private.h"
@ -41,6 +42,10 @@
#define DBG_MSG(x...)
#endif
static struct umutex addr_lock;
static struct wake_addr *wake_addr_head;
static struct wake_addr default_wake_addr;
/*
* This is called when the first thread (other than the initial
* thread) is created.
@ -130,3 +135,90 @@ _thr_setscheduler(lwpid_t lwpid, int policy, const struct sched_param *param)
_schedparam_to_rtp(policy, param, &rtp);
return (rtprio_thread(RTP_SET, lwpid, &rtp));
}
void
_thr_wake_addr_init(void)
{
_thr_umutex_init(&addr_lock);
wake_addr_head = NULL;
}
/*
* Allocate wake-address, the memory area is never freed after
* allocated, this becauses threads may be referencing it.
*/
struct wake_addr *
_thr_alloc_wake_addr(void)
{
struct pthread *curthread;
struct wake_addr *p;
if (_thr_initial == NULL) {
return &default_wake_addr;
}
curthread = _get_curthread();
THR_LOCK_ACQUIRE(curthread, &addr_lock);
if (wake_addr_head == NULL) {
unsigned i;
unsigned pagesize = getpagesize();
struct wake_addr *pp = (struct wake_addr *)
mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, -1, 0);
for (i = 1; i < pagesize/sizeof(struct wake_addr); ++i)
pp[i].link = &pp[i+1];
pp[i-1].link = NULL;
wake_addr_head = &pp[1];
p = &pp[0];
} else {
p = wake_addr_head;
wake_addr_head = p->link;
}
THR_LOCK_RELEASE(curthread, &addr_lock);
p->value = 0;
return (p);
}
void
_thr_release_wake_addr(struct wake_addr *wa)
{
struct pthread *curthread = _get_curthread();
if (wa == &default_wake_addr)
return;
THR_LOCK_ACQUIRE(curthread, &addr_lock);
wa->link = wake_addr_head;
wake_addr_head = wa;
THR_LOCK_RELEASE(curthread, &addr_lock);
}
/* Sleep on thread wakeup address */
int
_thr_sleep(struct pthread *curthread, int clockid,
const struct timespec *abstime)
{
curthread->will_sleep = 0;
if (curthread->nwaiter_defer > 0) {
_thr_wake_all(curthread->defer_waiters,
curthread->nwaiter_defer);
curthread->nwaiter_defer = 0;
}
if (curthread->wake_addr->value != 0)
return (0);
return _thr_umtx_timedwait_uint(&curthread->wake_addr->value, 0,
clockid, abstime, 0);
}
void
_thr_wake_all(unsigned int *waddrs[], int count)
{
int i;
for (i = 0; i < count; ++i)
*waddrs[i] = 1;
_umtx_op(waddrs, UMTX_OP_NWAKE_PRIVATE, count, NULL, NULL);
}

4
lib/libthr/thread/thr_list.c
View File

@ -165,6 +165,8 @@ _thr_alloc(struct pthread *curthread)
if (tcb != NULL) {
memset(thread, 0, sizeof(*thread));
thread->tcb = tcb;
thread->sleepqueue = _sleepq_alloc();
thread->wake_addr = _thr_alloc_wake_addr();
} else {
thr_destroy(curthread, thread);
atomic_fetchadd_int(&total_threads, -1);
@ -192,6 +194,8 @@ _thr_free(struct pthread *curthread, struct pthread *thread)
}
thread->tcb = NULL;
if ((curthread == NULL) || (free_thread_count >= MAX_CACHED_THREADS)) {
_sleepq_free(thread->sleepqueue);
_thr_release_wake_addr(thread->wake_addr);
thr_destroy(curthread, thread);
atomic_fetchadd_int(&total_threads, -1);
} else {

204
lib/libthr/thread/thr_mutex.c
View File

@ -92,7 +92,7 @@ int __pthread_mutex_setyieldloops_np(pthread_mutex_t *mutex, int count);
static int mutex_self_trylock(pthread_mutex_t);
static int mutex_self_lock(pthread_mutex_t,
const struct timespec *abstime);
static int mutex_unlock_common(pthread_mutex_t *);
static int mutex_unlock_common(struct pthread_mutex *, int);
static int mutex_lock_sleep(struct pthread *, pthread_mutex_t,
const struct timespec *);
@ -145,10 +145,9 @@ mutex_init(pthread_mutex_t *mutex,
calloc_cb(1, sizeof(struct pthread_mutex))) == NULL)
return (ENOMEM);
pmutex->m_type = attr->m_type;
pmutex->m_flags = attr->m_type;
pmutex->m_owner = NULL;
pmutex->m_count = 0;
pmutex->m_refcount = 0;
pmutex->m_spinloops = 0;
pmutex->m_yieldloops = 0;
MUTEX_INIT_LINK(pmutex);
@ -168,7 +167,7 @@ mutex_init(pthread_mutex_t *mutex,
break;
}
if (pmutex->m_type == PTHREAD_MUTEX_ADAPTIVE_NP) {
if (PMUTEX_TYPE(pmutex->m_flags) == PTHREAD_MUTEX_ADAPTIVE_NP) {
pmutex->m_spinloops =
_thr_spinloops ? _thr_spinloops: MUTEX_ADAPTIVE_SPINS;
pmutex->m_yieldloops = _thr_yieldloops;
@ -229,7 +228,7 @@ _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
ret = mutex_init(mutex, &attr, calloc_cb);
if (ret == 0)
(*mutex)->m_private = 1;
(*mutex)->m_flags |= PMUTEX_FLAG_PRIVATE;
return (ret);
}
@ -266,7 +265,7 @@ _pthread_mutex_destroy(pthread_mutex_t *mutex)
} else if (m == THR_MUTEX_DESTROYED) {
ret = EINVAL;
} else {
if (m->m_owner != NULL || m->m_refcount != 0) {
if (m->m_owner != NULL) {
ret = EBUSY;
} else {
*mutex = THR_MUTEX_DESTROYED;
@ -290,6 +289,17 @@ _pthread_mutex_destroy(pthread_mutex_t *mutex)
TAILQ_INSERT_TAIL(&curthread->pp_mutexq, (m), m_qe);\
} while (0)
#define DEQUEUE_MUTEX(curthread, m) \
(m)->m_owner = NULL; \
MUTEX_ASSERT_IS_OWNED(m); \
if (__predict_true(((m)->m_lock.m_flags & UMUTEX_PRIO_PROTECT) == 0)) \
TAILQ_REMOVE(&curthread->mutexq, (m), m_qe); \
else { \
TAILQ_REMOVE(&curthread->pp_mutexq, (m), m_qe); \
set_inherited_priority(curthread, m); \
} \
MUTEX_INIT_LINK(m);
#define CHECK_AND_INIT_MUTEX \
if (__predict_false((m = *mutex) <= THR_MUTEX_DESTROYED)) { \
if (m == THR_MUTEX_DESTROYED) \
@ -310,7 +320,7 @@ mutex_trylock_common(pthread_mutex_t *mutex)
int ret;
id = TID(curthread);
if (m->m_private)
if (m->m_flags & PMUTEX_FLAG_PRIVATE)
THR_CRITICAL_ENTER(curthread);
ret = _thr_umutex_trylock(&m->m_lock, id);
if (__predict_true(ret == 0)) {
@ -318,7 +328,7 @@ mutex_trylock_common(pthread_mutex_t *mutex)
} else if (m->m_owner == curthread) {
ret = mutex_self_trylock(m);
} /* else {} */
if (ret && m->m_private)
if (ret && (m->m_flags & PMUTEX_FLAG_PRIVATE))
THR_CRITICAL_LEAVE(curthread);
return (ret);
}
@ -403,12 +413,12 @@ done:
static inline int
mutex_lock_common(struct pthread_mutex *m,
const struct timespec *abstime)
const struct timespec *abstime, int cvattach)
{
struct pthread *curthread = _get_curthread();
int ret;
if (m->m_private)
if (!cvattach && m->m_flags & PMUTEX_FLAG_PRIVATE)
THR_CRITICAL_ENTER(curthread);
if (_thr_umutex_trylock2(&m->m_lock, TID(curthread)) == 0) {
ENQUEUE_MUTEX(curthread, m);
@ -416,7 +426,7 @@ mutex_lock_common(struct pthread_mutex *m,
} else {
ret = mutex_lock_sleep(curthread, m, abstime);
}
if (ret && m->m_private)
if (ret && (m->m_flags & PMUTEX_FLAG_PRIVATE) && !cvattach)
THR_CRITICAL_LEAVE(curthread);
return (ret);
}
@ -430,7 +440,7 @@ __pthread_mutex_lock(pthread_mutex_t *mutex)
CHECK_AND_INIT_MUTEX
return (mutex_lock_common(m, NULL));
return (mutex_lock_common(m, NULL, 0));
}
int
@ -442,28 +452,83 @@ __pthread_mutex_timedlock(pthread_mutex_t *mutex, const struct timespec *abstime
CHECK_AND_INIT_MUTEX
return (mutex_lock_common(m, abstime));
return (mutex_lock_common(m, abstime, 0));
}
int
_pthread_mutex_unlock(pthread_mutex_t *m)
_pthread_mutex_unlock(pthread_mutex_t *mutex)
{
return (mutex_unlock_common(m));
struct pthread_mutex *mp;
mp = *mutex;
return (mutex_unlock_common(mp, 0));
}
int
_mutex_cv_lock(pthread_mutex_t *mutex, int count)
_mutex_cv_lock(struct pthread_mutex *m, int count)
{
struct pthread_mutex *m;
int ret;
int error;
m = *mutex;
ret = mutex_lock_common(m, NULL);
if (ret == 0) {
m->m_refcount--;
m->m_count += count;
error = mutex_lock_common(m, NULL, 1);
if (error == 0)
m->m_count = count;
return (error);
}
int
_mutex_cv_unlock(struct pthread_mutex *m, int *count)
{
/*
* Clear the count in case this is a recursive mutex.
*/
*count = m->m_count;
m->m_count = 0;
(void)mutex_unlock_common(m, 1);
return (0);
}
int
_mutex_cv_attach(struct pthread_mutex *m, int count)
{
struct pthread *curthread = _get_curthread();
int error;
ENQUEUE_MUTEX(curthread, m);
m->m_count = count;
return (error);
}
int
_mutex_cv_detach(struct pthread_mutex *mp, int *recurse)
{
struct pthread *curthread = _get_curthread();
int defered;
int error;
if ((error = _mutex_owned(curthread, mp)) != 0)
return (error);
/*
* Clear the count in case this is a recursive mutex.
*/
*recurse = mp->m_count;
mp->m_count = 0;
DEQUEUE_MUTEX(curthread, mp);
/* Will this happen in real-world ? */
if ((mp->m_flags & PMUTEX_FLAG_DEFERED) != 0) {
defered = 1;
mp->m_flags &= ~PMUTEX_FLAG_DEFERED;
} else
defered = 0;
if (defered) {
_thr_wake_all(curthread->defer_waiters,
curthread->nwaiter_defer);
curthread->nwaiter_defer = 0;
}
return (ret);
return (0);
}
static int
@ -471,7 +536,7 @@ mutex_self_trylock(struct pthread_mutex *m)
{
int ret;
switch (m->m_type) {
switch (PMUTEX_TYPE(m->m_flags)) {
case PTHREAD_MUTEX_ERRORCHECK:
case PTHREAD_MUTEX_NORMAL:
ret = EBUSY;
@ -500,7 +565,7 @@ mutex_self_lock(struct pthread_mutex *m, const struct timespec *abstime)
struct timespec ts1, ts2;
int ret;
switch (m->m_type) {
switch (PMUTEX_TYPE(m->m_flags)) {
case PTHREAD_MUTEX_ERRORCHECK:
case PTHREAD_MUTEX_ADAPTIVE_NP:
if (abstime) {
@ -564,13 +629,12 @@ mutex_self_lock(struct pthread_mutex *m, const struct timespec *abstime)
}
static int
mutex_unlock_common(pthread_mutex_t *mutex)
mutex_unlock_common(struct pthread_mutex *m, int cv)
{
struct pthread *curthread = _get_curthread();
struct pthread_mutex *m;
uint32_t id;
int defered;
m = *mutex;
if (__predict_false(m <= THR_MUTEX_DESTROYED)) {
if (m == THR_MUTEX_DESTROYED)
return (EINVAL);
@ -585,65 +649,26 @@ mutex_unlock_common(pthread_mutex_t *mutex)
id = TID(curthread);
if (__predict_false(
m->m_type == PTHREAD_MUTEX_RECURSIVE &&
PMUTEX_TYPE(m->m_flags) == PTHREAD_MUTEX_RECURSIVE &&
m->m_count > 0)) {
m->m_count--;
} else {
m->m_owner = NULL;
/* Remove the mutex from the threads queue. */
MUTEX_ASSERT_IS_OWNED(m);
if (__predict_true((m->m_lock.m_flags & UMUTEX_PRIO_PROTECT) == 0))
TAILQ_REMOVE(&curthread->mutexq, m, m_qe);
else {
TAILQ_REMOVE(&curthread->pp_mutexq, m, m_qe);
set_inherited_priority(curthread, m);
}
MUTEX_INIT_LINK(m);
if (curthread->will_sleep == 0 && (m->m_flags & PMUTEX_FLAG_DEFERED) != 0) {
defered = 1;
m->m_flags &= ~PMUTEX_FLAG_DEFERED;
} else
defered = 0;
DEQUEUE_MUTEX(curthread, m);
_thr_umutex_unlock(&m->m_lock, id);
if (defered) {
_thr_wake_all(curthread->defer_waiters,
curthread->nwaiter_defer);
curthread->nwaiter_defer = 0;
}
}
if (m->m_private)
THR_CRITICAL_LEAVE(curthread);
return (0);
}
int
_mutex_cv_unlock(pthread_mutex_t *mutex, int *count)
{
struct pthread *curthread = _get_curthread();
struct pthread_mutex *m;
m = *mutex;
if (__predict_false(m <= THR_MUTEX_DESTROYED)) {
if (m == THR_MUTEX_DESTROYED)
return (EINVAL);
return (EPERM);
}
/*
* Check if the running thread is not the owner of the mutex.
*/
if (__predict_false(m->m_owner != curthread))
return (EPERM);
/*
* Clear the count in case this is a recursive mutex.
*/
*count = m->m_count;
m->m_refcount++;
m->m_count = 0;
m->m_owner = NULL;
/* Remove the mutex from the threads queue. */
MUTEX_ASSERT_IS_OWNED(m);
if (__predict_true((m->m_lock.m_flags & UMUTEX_PRIO_PROTECT) == 0))
TAILQ_REMOVE(&curthread->mutexq, m, m_qe);
else {
TAILQ_REMOVE(&curthread->pp_mutexq, m, m_qe);
set_inherited_priority(curthread, m);
}
MUTEX_INIT_LINK(m);
_thr_umutex_unlock(&m->m_lock, TID(curthread));
if (m->m_private)
if (!cv && m->m_flags & PMUTEX_FLAG_PRIVATE)
THR_CRITICAL_LEAVE(curthread);
return (0);
}
@ -757,3 +782,16 @@ _pthread_mutex_isowned_np(pthread_mutex_t *mutex)
return (0);
return (m->m_owner == _get_curthread());
}
int
_mutex_owned(struct pthread *curthread, const struct pthread_mutex *mp)
{
if (__predict_false(mp <= THR_MUTEX_DESTROYED)) {
if (mp == THR_MUTEX_DESTROYED)
return (EINVAL);
return (EPERM);
}
if (mp->m_owner != curthread)
return (EPERM);
return (0);
}

115
lib/libthr/thread/thr_private.h
View File

@ -135,18 +135,23 @@ TAILQ_HEAD(mutex_queue, pthread_mutex);
#define THR_RWLOCK_INITIALIZER ((struct pthread_rwlock *)NULL)
#define THR_RWLOCK_DESTROYED ((struct pthread_rwlock *)1)
#define PMUTEX_FLAG_TYPE_MASK 0x0ff
#define PMUTEX_FLAG_PRIVATE 0x100
#define PMUTEX_FLAG_DEFERED 0x200
#define PMUTEX_TYPE(mtxflags) ((mtxflags) & PMUTEX_FLAG_TYPE_MASK)
#define MAX_DEFER_WAITERS 50
struct pthread_mutex {
/*
* Lock for accesses to this structure.
*/
struct umutex m_lock;
enum pthread_mutextype m_type;
int m_flags;
struct pthread *m_owner;
int m_count;
int m_refcount;
int m_spinloops;
int m_yieldloops;
int m_private;
/*
* Link for all mutexes a thread currently owns.
*/
@ -163,10 +168,10 @@ struct pthread_mutex_attr {
{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE }
struct pthread_cond {
struct umutex c_lock;
struct ucond c_kerncv;
int c_pshared;
int c_clockid;
__uint32_t __has_user_waiters;
__uint32_t __has_kern_waiters;
__uint32_t __flags;
__uint32_t __clock_id;
};
struct pthread_cond_attr {
@ -245,6 +250,21 @@ struct pthread_attr {
size_t cpusetsize;
};
struct wake_addr {
struct wake_addr *link;
unsigned int value;
char pad[12];
};
struct sleepqueue {
TAILQ_HEAD(, pthread) sq_blocked;
SLIST_HEAD(, sleepqueue) sq_freeq;
LIST_ENTRY(sleepqueue) sq_hash;
SLIST_ENTRY(sleepqueue) sq_flink;
void *sq_wchan;
int sq_type;
};
/*
* Thread creation state attributes.
*/
@ -356,6 +376,9 @@ struct pthread {
/* Hash queue entry. */
LIST_ENTRY(pthread) hle;
/* Sleep queue entry */
TAILQ_ENTRY(pthread) wle;
/* Threads reference count. */
int refcount;
@ -482,6 +505,27 @@ struct pthread {
/* Event */
td_event_msg_t event_buf;
struct wake_addr *wake_addr;
#define WAKE_ADDR(td) ((td)->wake_addr)
/* Sleep queue */
struct sleepqueue *sleepqueue;
/* Wait channel */
void *wchan;
/* Referenced mutex. */
struct pthread_mutex *mutex_obj;
/* Thread will sleep. */
int will_sleep;
/* Number of threads deferred. */
int nwaiter_defer;
/* Deferred threads from pthread_cond_signal. */
unsigned int *defer_waiters[MAX_DEFER_WAITERS];
};
#define THR_SHOULD_GC(thrd) \
@ -519,6 +563,12 @@ do { \
_thr_umutex_lock(lck, TID(thrd)); \
} while (0)
#define THR_LOCK_ACQUIRE_SPIN(thrd, lck) \
do { \
(thrd)->locklevel++; \
_thr_umutex_lock_spin(lck, TID(thrd)); \
} while (0)
#ifdef _PTHREADS_INVARIANTS
#define THR_ASSERT_LOCKLEVEL(thrd) \
do { \
@ -671,8 +721,11 @@ extern struct umutex _thr_event_lock __hidden;
*/
__BEGIN_DECLS
int _thr_setthreaded(int) __hidden;
int _mutex_cv_lock(pthread_mutex_t *, int count) __hidden;
int _mutex_cv_unlock(pthread_mutex_t *, int *count) __hidden;
int _mutex_cv_lock(struct pthread_mutex *, int count) __hidden;
int _mutex_cv_unlock(struct pthread_mutex *, int *count) __hidden;
int _mutex_cv_attach(struct pthread_mutex *, int count) __hidden;
int _mutex_cv_detach(struct pthread_mutex *, int *count) __hidden;
int _mutex_owned(struct pthread *, const struct pthread_mutex *) __hidden;
int _mutex_reinit(pthread_mutex_t *) __hidden;
void _mutex_fork(struct pthread *curthread) __hidden;
void _libpthread_init(struct pthread *) __hidden;
@ -797,6 +850,50 @@ _thr_check_init(void)
_libpthread_init(NULL);
}
struct wake_addr *_thr_alloc_wake_addr(void);
void _thr_release_wake_addr(struct wake_addr *);
int _thr_sleep(struct pthread *, int, const struct timespec *);
void _thr_wake_addr_init(void) __hidden;
static inline void
_thr_clear_wake(struct pthread *td)
{
td->wake_addr->value = 0;
}
static inline int
_thr_is_woken(struct pthread *td)
{
return td->wake_addr->value != 0;
}
static inline void
_thr_set_wake(unsigned int *waddr)
{
*waddr = 1;
_thr_umtx_wake(waddr, INT_MAX, 0);
}
void _thr_wake_all(unsigned int *waddrs[], int) __hidden;
static inline struct pthread *
_sleepq_first(struct sleepqueue *sq)
{
return TAILQ_FIRST(&sq->sq_blocked);
}
void _sleepq_init(void) __hidden;
struct sleepqueue *_sleepq_alloc(void) __hidden;
void _sleepq_free(struct sleepqueue *) __hidden;
void _sleepq_lock(void *) __hidden;
void _sleepq_unlock(void *) __hidden;
struct sleepqueue *_sleepq_lookup(void *) __hidden;
void _sleepq_add(void *, struct pthread *) __hidden;
int _sleepq_remove(struct sleepqueue *, struct pthread *) __hidden;
void _sleepq_drop(struct sleepqueue *,
void (*cb)(struct pthread *, void *arg), void *) __hidden;
struct dl_phdr_info;
void __pthread_cxa_finalize(struct dl_phdr_info *phdr_info);
void _thr_tsd_unload(struct dl_phdr_info *phdr_info) __hidden;

53
lib/libthr/thread/thr_umtx.c
View File

@ -74,6 +74,39 @@ __thr_umutex_lock(struct umutex *mtx, uint32_t id)
return _umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0);
}
#define SPINLOOPS 1000
int
__thr_umutex_lock_spin(struct umutex *mtx, uint32_t id)
{
uint32_t owner;
if (!_thr_is_smp)
return __thr_umutex_lock(mtx, id);
if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) {
for (;;) {
int count = SPINLOOPS;
while (count--) {
owner = mtx->m_owner;
if ((owner & ~UMUTEX_CONTESTED) == 0) {
if (atomic_cmpset_acq_32(
&mtx->m_owner,
owner, id|owner)) {
return (0);
}
}
CPU_SPINWAIT;
}
/* wait in kernel */
_umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0);
}
}
return _umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0);
}
int
__thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
const struct timespec *ets)
@ -163,6 +196,26 @@ _thr_umtx_wait_uint(volatile u_int *mtx, u_int id, const struct timespec *timeou
__DECONST(void*, timeout));
}
int
_thr_umtx_timedwait_uint(volatile u_int *mtx, u_int id, int clockid,
const struct timespec *abstime, int shared)
{
struct timespec ts, ts2, *tsp;
if (abstime != NULL) {
clock_gettime(clockid, &ts);
TIMESPEC_SUB(&ts2, abstime, &ts);
if (ts2.tv_sec < 0 || ts2.tv_nsec <= 0)
return (ETIMEDOUT);
tsp = &ts2;
} else {
tsp = NULL;
}
return _umtx_op_err(__DEVOLATILE(void *, mtx),
shared ? UMTX_OP_WAIT_UINT : UMTX_OP_WAIT_UINT_PRIVATE, id, NULL,
tsp);
}
int
_thr_umtx_wake(volatile void *mtx, int nr_wakeup, int shared)
{

11
lib/libthr/thread/thr_umtx.h
View File

@ -36,6 +36,7 @@
#define DEFAULT_URWLOCK {0,0,0,0,{0,0,0,0}}
int __thr_umutex_lock(struct umutex *mtx, uint32_t id) __hidden;
int __thr_umutex_lock_spin(struct umutex *mtx, uint32_t id) __hidden;
int __thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
const struct timespec *timeout) __hidden;
int __thr_umutex_unlock(struct umutex *mtx, uint32_t id) __hidden;
@ -50,6 +51,8 @@ int _thr_umtx_wait(volatile long *mtx, long exp,
const struct timespec *timeout) __hidden;
int _thr_umtx_wait_uint(volatile u_int *mtx, u_int exp,
const struct timespec *timeout, int shared) __hidden;
int _thr_umtx_timedwait_uint(volatile u_int *mtx, u_int exp, int clockid,
const struct timespec *timeout, int shared) __hidden;
int _thr_umtx_wake(volatile void *mtx, int count, int shared) __hidden;
int _thr_ucond_wait(struct ucond *cv, struct umutex *m,
const struct timespec *timeout, int check_unpaking) __hidden;
@ -96,6 +99,14 @@ _thr_umutex_lock(struct umutex *mtx, uint32_t id)
return (__thr_umutex_lock(mtx, id));
}
static inline int
_thr_umutex_lock_spin(struct umutex *mtx, uint32_t id)
{
if (_thr_umutex_trylock2(mtx, id) == 0)
return (0);
return (__thr_umutex_lock_spin(mtx, id));
}
static inline int
_thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
const struct timespec *timeout)

120
sys/kern/kern_umtx.c
View File

@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/syscallsubr.h>
#include <sys/eventhandler.h>
#include <sys/umtx.h>
@ -2351,6 +2352,7 @@ do_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m,
struct timeval tv;
struct timespec cts, ets, tts;
uint32_t flags;
uint32_t clockid;
int error;
uq = td->td_umtxq;
@ -2358,16 +2360,29 @@ do_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m,
error = umtx_key_get(cv, TYPE_CV, GET_SHARE(flags), &uq->uq_key);
if (error != 0)
return (error);
if ((wflags & CVWAIT_CLOCKID) != 0) {
clockid = fuword32(&cv->c_clockid);
if (clockid < CLOCK_REALTIME ||
clockid >= CLOCK_THREAD_CPUTIME_ID) {
/* hmm, only HW clock id will work. */
return (EINVAL);
}
} else {
clockid = CLOCK_REALTIME;
}
umtxq_lock(&uq->uq_key);
umtxq_busy(&uq->uq_key);
umtxq_insert(uq);
umtxq_unlock(&uq->uq_key);
/*
* The magic thing is we should set c_has_waiters to 1 before
* releasing user mutex.
* Set c_has_waiters to 1 before releasing user mutex, also
* don't modify cache line when unnecessary.
*/
suword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters), 1);
if (fuword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters)) == 0)
suword32(__DEVOLATILE(uint32_t *, &cv->c_has_waiters), 1);
umtxq_lock(&uq->uq_key);
umtxq_unbusy(&uq->uq_key);
@ -2377,21 +2392,25 @@ do_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m,
umtxq_lock(&uq->uq_key);
if (error == 0) {
if ((wflags & UMTX_CHECK_UNPARKING) &&
(td->td_pflags & TDP_WAKEUP)) {
td->td_pflags &= ~TDP_WAKEUP;
error = EINTR;
} else if (timeout == NULL) {
if (timeout == NULL) {
error = umtxq_sleep(uq, "ucond", 0);
} else {
getnanouptime(&ets);
timespecadd(&ets, timeout);
TIMESPEC_TO_TIMEVAL(&tv, timeout);
if ((wflags & CVWAIT_ABSTIME) == 0) {
kern_clock_gettime(td, clockid, &ets);
timespecadd(&ets, timeout);
tts = *timeout;
} else { /* absolute time */
ets = *timeout;
tts = *timeout;
kern_clock_gettime(td, clockid, &cts);
timespecsub(&tts, &cts);
}
TIMESPEC_TO_TIMEVAL(&tv, &tts);
for (;;) {
error = umtxq_sleep(uq, "ucond", tvtohz(&tv));
if (error != ETIMEDOUT)
break;
getnanouptime(&cts);
kern_clock_gettime(td, clockid, &cts);
if (timespeccmp(&cts, &ets, >=)) {
error = ETIMEDOUT;
break;
@ -2406,7 +2425,24 @@ do_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m,
if ((uq->uq_flags & UQF_UMTXQ) == 0)
error = 0;
else {
umtxq_remove(uq);
/*
* This must be timeout,interrupted by signal or
* surprious wakeup, clear c_has_waiter flag when
* necessary.
*/
umtxq_busy(&uq->uq_key);
if ((uq->uq_flags & UQF_UMTXQ) != 0) {
int oldlen = uq->uq_cur_queue->length;
umtxq_remove(uq);
if (oldlen == 1) {
umtxq_unlock(&uq->uq_key);
suword32(
__DEVOLATILE(uint32_t *,
&cv->c_has_waiters), 0);
umtxq_lock(&uq->uq_key);
}
}
umtxq_unbusy(&uq->uq_key);
if (error == ERESTART)
error = EINTR;
}
@ -3029,6 +3065,32 @@ __umtx_op_wake(struct thread *td, struct _umtx_op_args *uap)
return (kern_umtx_wake(td, uap->obj, uap->val, 0));
}
#define BATCH_SIZE 128
static int
__umtx_op_nwake_private(struct thread *td, struct _umtx_op_args *uap)
{
int count = uap->val;
void *uaddrs[BATCH_SIZE];
char **upp = (char **)uap->obj;
int tocopy;
int error = 0;
int i, pos = 0;
while (count > 0) {
tocopy = count;
if (tocopy > BATCH_SIZE)
tocopy = BATCH_SIZE;
error = copyin(upp+pos, uaddrs, tocopy * sizeof(char *));
if (error != 0)
break;
for (i = 0; i < tocopy; ++i)
kern_umtx_wake(td, uaddrs[i], INT_MAX, 1);
count -= tocopy;
pos += tocopy;
}
return (error);
}
static int
__umtx_op_wake_private(struct thread *td, struct _umtx_op_args *uap)
{
@ -3245,7 +3307,8 @@ static _umtx_op_func op_table[] = {
__umtx_op_wait_umutex, /* UMTX_OP_UMUTEX_WAIT */
__umtx_op_wake_umutex, /* UMTX_OP_UMUTEX_WAKE */
__umtx_op_sem_wait, /* UMTX_OP_SEM_WAIT */
__umtx_op_sem_wake /* UMTX_OP_SEM_WAKE */
__umtx_op_sem_wake, /* UMTX_OP_SEM_WAKE */
__umtx_op_nwake_private /* UMTX_OP_NWAKE_PRIVATE */
};
int
@ -3487,6 +3550,32 @@ __umtx_op_sem_wait_compat32(struct thread *td, struct _umtx_op_args *uap)
return (do_sem_wait(td, uap->obj, ts));
}
static int
__umtx_op_nwake_private32(struct thread *td, struct _umtx_op_args *uap)
{
int count = uap->val;
uint32_t uaddrs[BATCH_SIZE];
uint32_t **upp = (uint32_t **)uap->obj;
int tocopy;
int error = 0;
int i, pos = 0;
while (count > 0) {
tocopy = count;
if (tocopy > BATCH_SIZE)
tocopy = BATCH_SIZE;
error = copyin(upp+pos, uaddrs, tocopy * sizeof(uint32_t));
if (error != 0)
break;
for (i = 0; i < tocopy; ++i)
kern_umtx_wake(td, (void *)(intptr_t)uaddrs[i],
INT_MAX, 1);
count -= tocopy;
pos += tocopy;
}
return (error);
}
static _umtx_op_func op_table_compat32[] = {
__umtx_op_lock_umtx_compat32, /* UMTX_OP_LOCK */
__umtx_op_unlock_umtx_compat32, /* UMTX_OP_UNLOCK */
@ -3508,7 +3597,8 @@ static _umtx_op_func op_table_compat32[] = {
__umtx_op_wait_umutex_compat32, /* UMTX_OP_UMUTEX_WAIT */
__umtx_op_wake_umutex, /* UMTX_OP_UMUTEX_WAKE */
__umtx_op_sem_wait_compat32, /* UMTX_OP_SEM_WAIT */
__umtx_op_sem_wake /* UMTX_OP_SEM_WAKE */
__umtx_op_sem_wake, /* UMTX_OP_SEM_WAKE */
__umtx_op_nwake_private32 /* UMTX_OP_NWAKE_PRIVATE */
};
int

3
sys/sys/_umtx.h
View File

@ -46,7 +46,8 @@ struct umutex {
struct ucond {
volatile __uint32_t c_has_waiters; /* Has waiters in kernel */
__uint32_t c_flags; /* Flags of the condition variable */
__uint32_t c_spare[2]; /* Spare space */
__uint32_t c_clockid; /* Clock id */
__uint32_t c_spare[1]; /* Spare space */
};
struct urwlock {

11
sys/sys/umtx.h
View File

@ -79,10 +79,15 @@
#define UMTX_OP_MUTEX_WAKE 18
#define UMTX_OP_SEM_WAIT 19
#define UMTX_OP_SEM_WAKE 20
#define UMTX_OP_MAX 21
#define UMTX_OP_NWAKE_PRIVATE 21
#define UMTX_OP_MAX 22
/* flags for UMTX_OP_CV_WAIT */
#define UMTX_CHECK_UNPARKING 0x01
/* Flags for UMTX_OP_CV_WAIT */
#define CVWAIT_CHECK_UNPARKING 0x01
#define CVWAIT_ABSTIME 0x02
#define CVWAIT_CLOCKID 0x04
#define UMTX_CHECK_UNPARKING CVWAIT_CHECK_UNPARKING
#ifndef _KERNEL