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MFcalloutng:

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Extend condvar(9) KPI introducing sbt variant of cv_timedwait. This
rely on the previously committed sleepq_set_timeout_sbt().

Sponsored by:	Google Summer of Code 2012, iXsystems inc.
Tested by:	flo, marius, ian, markj, Fabian Keil
This commit is contained in:
Davide Italiano 2013-03-04 12:20:48 +00:00
parent 7392d01c36
commit 461537356a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=247785
2 changed files with 26 additions and 15 deletions
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25
sys/kern/kern_condvar.c
View File

@ -270,12 +270,13 @@ _cv_wait_sig(struct cv *cvp, struct lock_object *lock)
}
/*
* Wait on a condition variable for at most timo/hz seconds. Returns 0 if the
* process was resumed by cv_signal or cv_broadcast, EWOULDBLOCK if the timeout
* expires.
* Wait on a condition variable for (at most) the value specified in sbt
* argument. Returns 0 if the process was resumed by cv_signal or cv_broadcast,
* EWOULDBLOCK if the timeout expires.
*/
int
_cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo)
_cv_timedwait_sbt(struct cv *cvp, struct lock_object *lock, sbintime_t sbt,
sbintime_t pr, int flags)
{
WITNESS_SAVE_DECL(lock_witness);
struct lock_class *class;
@ -311,7 +312,7 @@ _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo)
DROP_GIANT();
sleepq_add(cvp, lock, cvp->cv_description, SLEEPQ_CONDVAR, 0);
sleepq_set_timeout(cvp, timo);
sleepq_set_timeout_sbt(cvp, sbt, pr, flags);
if (lock != &Giant.lock_object) {
if (class->lc_flags & LC_SLEEPABLE)
sleepq_release(cvp);
@ -336,13 +337,15 @@ _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo)
}
/*
* Wait on a condition variable for at most timo/hz seconds, allowing
* interruption by signals. Returns 0 if the thread was resumed by cv_signal
* or cv_broadcast, EWOULDBLOCK if the timeout expires, and EINTR or ERESTART if
* a signal was caught.
* Wait on a condition variable for (at most) the value specified in sbt
* argument, allowing interruption by signals.
* Returns 0 if the thread was resumed by cv_signal or cv_broadcast,
* EWOULDBLOCK if the timeout expires, and EINTR or ERESTART if a signal
* was caught.
*/
int
_cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo)
_cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock,
sbintime_t sbt, sbintime_t pr, int flags)
{
WITNESS_SAVE_DECL(lock_witness);
struct lock_class *class;
@ -379,7 +382,7 @@ _cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo)
sleepq_add(cvp, lock, cvp->cv_description, SLEEPQ_CONDVAR |
SLEEPQ_INTERRUPTIBLE, 0);
sleepq_set_timeout(cvp, timo);
sleepq_set_timeout_sbt(cvp, sbt, pr, flags);
if (lock != &Giant.lock_object) {
if (class->lc_flags & LC_SLEEPABLE)
sleepq_release(cvp);

16
sys/sys/condvar.h
View File

@ -55,8 +55,10 @@ void cv_destroy(struct cv *cvp);
void _cv_wait(struct cv *cvp, struct lock_object *lock);
void _cv_wait_unlock(struct cv *cvp, struct lock_object *lock);
int _cv_wait_sig(struct cv *cvp, struct lock_object *lock);
int _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo);
int _cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo);
int _cv_timedwait_sbt(struct cv *cvp, struct lock_object *lock,
sbintime_t sbt, sbintime_t pr, int flags);
int _cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock,
sbintime_t sbt, sbintime_t pr, int flags);
void cv_signal(struct cv *cvp);
void cv_broadcastpri(struct cv *cvp, int pri);
@ -68,9 +70,15 @@ void cv_broadcastpri(struct cv *cvp, int pri);
#define cv_wait_sig(cvp, lock) \
_cv_wait_sig((cvp), &(lock)->lock_object)
#define cv_timedwait(cvp, lock, timo) \
_cv_timedwait((cvp), &(lock)->lock_object, (timo))
_cv_timedwait_sbt((cvp), &(lock)->lock_object, \
tick_sbt * (timo), 0, C_HARDCLOCK)
#define cv_timedwait_sbt(cvp, lock, sbt, pr, flags) \
_cv_timedwait_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
#define cv_timedwait_sig(cvp, lock, timo) \
_cv_timedwait_sig((cvp), &(lock)->lock_object, (timo))
_cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, \
tick_sbt * (timo), 0, C_HARDCLOCK)
#define cv_timedwait_sig_sbt(cvp, lock, sbt, pr, flags) \
_cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
#define cv_broadcast(cvp) cv_broadcastpri(cvp, 0)