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Add cv_timedwait_interruptible() function

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The cv_timedwait() function by definition must wait unconditionally
for cv_signal()/cv_broadcast() before waking.  This causes processes
to go in the D state which increases the load average.  The load
average is the summation of processes in D state and run queue.

To avoid this it can be desirable to sleep interruptibly.  These
processes do not count against the load average but may be woken by
a signal.  It is up to the caller to determine why the process
was woken it may be for one of three reasons.

  1) cv_signal()/cv_broadcast()
  2) the timeout expired
  3) a signal was received

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Neependra Khare
2010-12-06 17:05:58 +05:30
committed by Brian Behlendorf
parent 6bf4d76f47
commit 3f688a8c38
2 changed files with 33 additions and 16 deletions
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include/sys/condvar.h
+16 -12
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@@ -53,21 +53,25 @@ extern void __cv_destroy(kcondvar_t *cvp);
extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
extern void __cv_wait_interruptible(kcondvar_t *cvp, kmutex_t *mp);
extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time);
extern clock_t __cv_timedwait_interruptible(kcondvar_t *cvp, kmutex_t *mp,
clock_t exp_time);
extern void __cv_signal(kcondvar_t *cvp);
extern void __cv_broadcast(kcondvar_t *cvp);
#define cv_init(cvp, name, type, arg) \
({ \
if ((name) == NULL) \
__cv_init(cvp, #cvp, type, arg); \
else \
__cv_init(cvp, name, type, arg); \
#define cv_init(cvp, name, type, arg) \
({ \
if ((name) == NULL) \
__cv_init(cvp, #cvp, type, arg); \
else \
__cv_init(cvp, name, type, arg); \
})
#define cv_destroy(cvp) __cv_destroy(cvp)
#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
#define cv_wait_interruptible(cvp, mp) __cv_wait_interruptible(cvp, mp)
#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
#define cv_signal(cvp) __cv_signal(cvp)
#define cv_broadcast(cvp) __cv_broadcast(cvp)
#define cv_destroy(cvp) __cv_destroy(cvp)
#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
#define cv_wait_interruptible(cvp, mp) __cv_wait_interruptible(cvp,mp)
#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
#define cv_timedwait_interruptible(cvp, mp, t) \
__cv_timedwait_interruptible(cvp, mp, t)
#define cv_signal(cvp) __cv_signal(cvp)
#define cv_broadcast(cvp) __cv_broadcast(cvp)
#endif /* _SPL_CONDVAR_H */