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Rename cv_wait_interruptible() to cv_wait_sig()
Commit f752b46e added the cv_wait_interruptible() function to allow
condition variables to be woken by signals. This function and its
timed wait counterpart should have been named cv_wait_sig() to match
the illumos interface which provides the same functionality.
This patch renames the symbol but leaves a #define compatibility
wrapper in place until the ZFS code can be moved to the correct
name.
This patch also makes a small number of cosmetic changes to make
the condvar source and header cstyle clean.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #456
This commit is contained in:
Brian Behlendorf
parent
86c16c59fe
commit
2345368646
@ -1,4 +1,4 @@
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/*****************************************************************************\
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/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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@ -20,10 +20,10 @@
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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*/
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#ifndef _SPL_CONDVAR_H
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#define _SPL_CONDVAR_H
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#define _SPL_CONDVAR_H
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#include <linux/module.h>
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#include <linux/wait.h>
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@ -36,8 +36,8 @@
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* The kcondvar_t struct is protected by mutex taken externally before
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* calling any of the wait/signal funs, and passed into the wait funs.
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*/
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#define CV_MAGIC 0x346545f4
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#define CV_DESTROY 0x346545f5
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#define CV_MAGIC 0x346545f4
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#define CV_DESTROY 0x346545f5
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typedef struct {
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int cv_magic;
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@ -48,30 +48,30 @@ typedef struct {
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kmutex_t *cv_mutex;
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} kcondvar_t;
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typedef enum { CV_DEFAULT=0, CV_DRIVER } kcv_type_t;
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typedef enum { CV_DEFAULT = 0, CV_DRIVER } kcv_type_t;
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extern void __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg);
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extern void __cv_destroy(kcondvar_t *cvp);
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extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
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extern void __cv_wait_io(kcondvar_t *cvp, kmutex_t *mp);
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extern void __cv_wait_interruptible(kcondvar_t *cvp, kmutex_t *mp);
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extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time);
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extern clock_t __cv_timedwait_interruptible(kcondvar_t *cvp, kmutex_t *mp,
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clock_t exp_time);
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extern clock_t cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp,
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hrtime_t tim, hrtime_t res, int flag);
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extern void __cv_signal(kcondvar_t *cvp);
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extern void __cv_broadcast(kcondvar_t *cvp);
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extern void __cv_init(kcondvar_t *, char *, kcv_type_t, void *);
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extern void __cv_destroy(kcondvar_t *);
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extern void __cv_wait(kcondvar_t *, kmutex_t *);
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extern void __cv_wait_io(kcondvar_t *, kmutex_t *);
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extern void __cv_wait_sig(kcondvar_t *, kmutex_t *);
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extern clock_t __cv_timedwait(kcondvar_t *, kmutex_t *, clock_t);
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extern clock_t __cv_timedwait_sig(kcondvar_t *, kmutex_t *, clock_t);
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extern clock_t cv_timedwait_hires(kcondvar_t *, kmutex_t *, hrtime_t,
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hrtime_t res, int flag);
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extern void __cv_signal(kcondvar_t *);
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extern void __cv_broadcast(kcondvar_t *c);
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#define cv_init(cvp, name, type, arg) __cv_init(cvp, name, type, arg)
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#define cv_destroy(cvp) __cv_destroy(cvp)
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#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
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#define cv_wait_io(cvp, mp) __cv_wait_io(cvp, mp)
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#define cv_wait_interruptible(cvp, mp) __cv_wait_interruptible(cvp,mp)
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#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
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#define cv_timedwait_interruptible(cvp, mp, t) \
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__cv_timedwait_interruptible(cvp, mp, t)
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#define cv_signal(cvp) __cv_signal(cvp)
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#define cv_broadcast(cvp) __cv_broadcast(cvp)
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#define cv_init(cvp, name, type, arg) __cv_init(cvp, name, type, arg)
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#define cv_destroy(cvp) __cv_destroy(cvp)
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#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
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#define cv_wait_io(cvp, mp) __cv_wait_io(cvp, mp)
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#define cv_wait_sig(cvp, mp) __cv_wait_sig(cvp, mp)
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#define cv_wait_interruptible(cvp, mp) cv_wait_sig(cvp, mp)
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#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
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#define cv_timedwait_sig(cvp, mp, t) __cv_timedwait_sig(cvp, mp, t)
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#define cv_timedwait_interruptible(cvp, mp, t) cv_timedwait_sig(cvp, mp, t)
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#define cv_signal(cvp) __cv_signal(cvp)
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#define cv_broadcast(cvp) __cv_broadcast(cvp)
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#endif /* _SPL_CONDVAR_H */
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@ -1,4 +1,4 @@
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/*****************************************************************************\
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/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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@ -20,9 +20,9 @@
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*****************************************************************************
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*
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* Solaris Porting Layer (SPL) Credential Implementation.
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\*****************************************************************************/
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*/
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#include <sys/condvar.h>
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#include <sys/time.h>
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@ -50,10 +50,10 @@ cv_destroy_wakeup(kcondvar_t *cvp)
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if (!atomic_read(&cvp->cv_waiters) && !atomic_read(&cvp->cv_refs)) {
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ASSERT(cvp->cv_mutex == NULL);
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ASSERT(!waitqueue_active(&cvp->cv_event));
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return 1;
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return (1);
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}
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return 0;
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return (0);
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}
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void
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@ -82,7 +82,7 @@ cv_wait_common(kcondvar_t *cvp, kmutex_t *mp, int state, int io)
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DEFINE_WAIT(wait);
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ASSERT(cvp);
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ASSERT(mp);
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ASSERT(mp);
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ASSERT(cvp->cv_magic == CV_MAGIC);
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ASSERT(mutex_owned(mp));
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atomic_inc(&cvp->cv_refs);
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@ -96,9 +96,11 @@ cv_wait_common(kcondvar_t *cvp, kmutex_t *mp, int state, int io)
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prepare_to_wait_exclusive(&cvp->cv_event, &wait, state);
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atomic_inc(&cvp->cv_waiters);
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/* Mutex should be dropped after prepare_to_wait() this
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/*
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* Mutex should be dropped after prepare_to_wait() this
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* ensures we're linked in to the waiters list and avoids the
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* race where 'cvp->cv_waiters > 0' but the list is empty. */
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* race where 'cvp->cv_waiters > 0' but the list is empty.
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*/
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mutex_exit(mp);
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if (io)
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io_schedule();
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@ -124,11 +126,11 @@ __cv_wait(kcondvar_t *cvp, kmutex_t *mp)
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EXPORT_SYMBOL(__cv_wait);
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void
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__cv_wait_interruptible(kcondvar_t *cvp, kmutex_t *mp)
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__cv_wait_sig(kcondvar_t *cvp, kmutex_t *mp)
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{
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cv_wait_common(cvp, mp, TASK_INTERRUPTIBLE, 0);
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}
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EXPORT_SYMBOL(__cv_wait_interruptible);
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EXPORT_SYMBOL(__cv_wait_sig);
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void
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__cv_wait_io(kcondvar_t *cvp, kmutex_t *mp)
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@ -137,18 +139,19 @@ __cv_wait_io(kcondvar_t *cvp, kmutex_t *mp)
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}
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EXPORT_SYMBOL(__cv_wait_io);
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/* 'expire_time' argument is an absolute wall clock time in jiffies.
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/*
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* 'expire_time' argument is an absolute wall clock time in jiffies.
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* Return value is time left (expire_time - now) or -1 if timeout occurred.
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*/
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static clock_t
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__cv_timedwait_common(kcondvar_t *cvp, kmutex_t *mp,
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clock_t expire_time, int state)
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__cv_timedwait_common(kcondvar_t *cvp, kmutex_t *mp, clock_t expire_time,
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int state)
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{
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DEFINE_WAIT(wait);
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clock_t time_left;
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ASSERT(cvp);
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ASSERT(mp);
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ASSERT(mp);
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ASSERT(cvp->cv_magic == CV_MAGIC);
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ASSERT(mutex_owned(mp));
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atomic_inc(&cvp->cv_refs);
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@ -169,9 +172,11 @@ __cv_timedwait_common(kcondvar_t *cvp, kmutex_t *mp,
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prepare_to_wait_exclusive(&cvp->cv_event, &wait, state);
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atomic_inc(&cvp->cv_waiters);
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/* Mutex should be dropped after prepare_to_wait() this
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/*
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* Mutex should be dropped after prepare_to_wait() this
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* ensures we're linked in to the waiters list and avoids the
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* race where 'cvp->cv_waiters > 0' but the list is empty. */
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* race where 'cvp->cv_waiters > 0' but the list is empty.
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*/
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mutex_exit(mp);
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time_left = schedule_timeout(time_left);
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mutex_enter(mp);
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@ -191,24 +196,24 @@ __cv_timedwait_common(kcondvar_t *cvp, kmutex_t *mp,
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clock_t
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__cv_timedwait(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time)
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{
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return __cv_timedwait_common(cvp, mp, exp_time, TASK_UNINTERRUPTIBLE);
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return (__cv_timedwait_common(cvp, mp, exp_time, TASK_UNINTERRUPTIBLE));
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}
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EXPORT_SYMBOL(__cv_timedwait);
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clock_t
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__cv_timedwait_interruptible(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time)
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__cv_timedwait_sig(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time)
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{
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return __cv_timedwait_common(cvp, mp, exp_time, TASK_INTERRUPTIBLE);
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return (__cv_timedwait_common(cvp, mp, exp_time, TASK_INTERRUPTIBLE));
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}
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EXPORT_SYMBOL(__cv_timedwait_interruptible);
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EXPORT_SYMBOL(__cv_timedwait_sig);
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/*
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*'expire_time' argument is an absolute clock time in nanoseconds.
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* 'expire_time' argument is an absolute clock time in nanoseconds.
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* Return value is time left (expire_time - now) or -1 if timeout occurred.
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*/
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static clock_t
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__cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp,
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hrtime_t expire_time, int state)
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__cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t expire_time,
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int state)
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{
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DEFINE_WAIT(wait);
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hrtime_t time_left, now;
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@ -237,12 +242,16 @@ __cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp,
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prepare_to_wait_exclusive(&cvp->cv_event, &wait, state);
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atomic_inc(&cvp->cv_waiters);
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/* Mutex should be dropped after prepare_to_wait() this
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/*
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* Mutex should be dropped after prepare_to_wait() this
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* ensures we're linked in to the waiters list and avoids the
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* race where 'cvp->cv_waiters > 0' but the list is empty. */
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* race where 'cvp->cv_waiters > 0' but the list is empty.
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*/
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mutex_exit(mp);
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/* Allow a 100 us range to give kernel an opportunity to coalesce
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* interrupts */
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/*
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* Allow a 100 us range to give kernel an opportunity to coalesce
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* interrupts
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*/
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usleep_range(time_left_us, time_left_us + 100);
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mutex_enter(mp);
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@ -263,8 +272,8 @@ __cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp,
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* Compatibility wrapper for the cv_timedwait_hires() Illumos interface.
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*/
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clock_t
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cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim,
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hrtime_t res, int flag)
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cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res,
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int flag)
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{
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if (res > 1) {
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/*
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@ -278,7 +287,7 @@ cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim,
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if (!(flag & CALLOUT_FLAG_ABSOLUTE))
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tim += gethrtime();
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return __cv_timedwait_hires(cvp, mp, tim, TASK_UNINTERRUPTIBLE);
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return (__cv_timedwait_hires(cvp, mp, tim, TASK_UNINTERRUPTIBLE));
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}
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EXPORT_SYMBOL(cv_timedwait_hires);
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@ -289,10 +298,12 @@ __cv_signal(kcondvar_t *cvp)
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ASSERT(cvp->cv_magic == CV_MAGIC);
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atomic_inc(&cvp->cv_refs);
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/* All waiters are added with WQ_FLAG_EXCLUSIVE so only one
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/*
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* All waiters are added with WQ_FLAG_EXCLUSIVE so only one
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* waiter will be set runable with each call to wake_up().
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* Additionally wake_up() holds a spin_lock assoicated with
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* the wait queue to ensure we don't race waking up processes. */
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* the wait queue to ensure we don't race waking up processes.
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*/
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if (atomic_read(&cvp->cv_waiters) > 0)
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wake_up(&cvp->cv_event);
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@ -307,8 +318,10 @@ __cv_broadcast(kcondvar_t *cvp)
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ASSERT(cvp->cv_magic == CV_MAGIC);
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atomic_inc(&cvp->cv_refs);
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/* Wake_up_all() will wake up all waiters even those which
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* have the WQ_FLAG_EXCLUSIVE flag set. */
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/*
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* Wake_up_all() will wake up all waiters even those which
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* have the WQ_FLAG_EXCLUSIVE flag set.
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*/
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if (atomic_read(&cvp->cv_waiters) > 0)
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wake_up_all(&cvp->cv_event);
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