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Add cv_wait_interruptible() function.

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This is a minor extension to the condition variable API to allow
for reasonable signal handling on Linux.  The cv_wait() function by
definition must wait unconditionally for cv_signal()/cv_broadcast()
before waking it.  This makes it impossible to woken by a signal
such as SIGTERM.  The cv_wait_interruptible() function was added
to handle this case.  It behaves identically to cv_wait() with the
exception that it waits interruptibly allowing a signal to wake it
up.  This means you do need to be careful and check issig() after
waking.
This commit is contained in:
Brian Behlendorf
2010-05-14 09:24:51 -07:00
parent 97f8f6d789
commit f752b46eb3
2 changed files with 19 additions and 6 deletions
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include/sys/condvar.h
+3 -2
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@@ -57,8 +57,8 @@ typedef enum { CV_DEFAULT=0, CV_DRIVER } kcv_type_t;
extern void __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg);
extern void __cv_destroy(kcondvar_t *cvp);
extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp,
clock_t expire_time);
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 void __cv_signal(kcondvar_t *cvp);
extern void __cv_broadcast(kcondvar_t *cvp);
@@ -71,6 +71,7 @@ extern void __cv_broadcast(kcondvar_t *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_signal(cvp) __cv_signal(cvp)
#define cv_broadcast(cvp) __cv_broadcast(cvp)