Brian Behlendorf 058de03caa Clear cv->cv_mutex when not in use ... For debugging purposes the condition varaibles keep track of the mutex used during a wait. The idea is to validate that all callers always use the same mutex. Unfortunately, we have seen cases where the caller reuses the condition variable with a different mutex but in a way which is known to be safe. My reading of the man pages suggests you should not do this and always cv_destroy()/cv_init() a new mutex. However, there is overhead in doing this and it does appear to be allowed under Solaris. To accomidate this behavior cv_wait_common() and __cv_timedwait() have been modified to clear the associated mutex when the last waiter is dropped. This ensures that while the condition variable is in use the incorrect mutex case is detected. It also allows the condition variable to be safely recycled without requiring the overhead of a cv_destroy()/cv_init() as long as it isn't currently in use. Finally, spin lock cv->cv_lock was removed because it is not required. When the condition variable is used properly the caller will always be holding the mutex so the spin lock is redundant. The lock was originally added because I expected to need to protect more than just the cv->cv_mutex. It turns out that was not the case. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>		2010-11-29 11:02:34 -08:00
..
fm	Public Release Prep	2010-05-17 15:18:00 -07:00
fs	Public Release Prep	2010-05-17 15:18:00 -07:00
sysevent	Public Release Prep	2010-05-17 15:18:00 -07:00
acl_impl.h	Public Release Prep	2010-05-17 15:18:00 -07:00
acl.h	Public Release Prep	2010-05-17 15:18:00 -07:00
atomic.h	atomic_*_*_nv() functions need to return the new value atomically.	2010-09-17 16:03:25 -07:00
attr.h	Public Release Prep	2010-05-17 15:18:00 -07:00
bitmap.h	Public Release Prep	2010-05-17 15:18:00 -07:00
bootconf.h	Public Release Prep	2010-05-17 15:18:00 -07:00
bootprops.h	Stub out additional missing headers	2010-06-11 15:57:25 -07:00
buf.h	Public Release Prep	2010-05-17 15:18:00 -07:00
byteorder.h	Public Release Prep	2010-05-17 15:18:00 -07:00
callb.h	Public Release Prep	2010-05-17 15:18:00 -07:00
cmn_err.h	Public Release Prep	2010-05-17 15:18:00 -07:00
compress.h	Public Release Prep	2010-05-17 15:18:00 -07:00
condvar.h	Clear cv->cv_mutex when not in use	2010-11-29 11:02:34 -08:00
conf.h	Public Release Prep	2010-05-17 15:18:00 -07:00
console.h	Public Release Prep	2010-05-17 15:18:00 -07:00
cpupart.h	Stub out additional missing headers	2010-06-11 15:57:25 -07:00
cpuvar.h	Public Release Prep	2010-05-17 15:18:00 -07:00
crc32.h	Public Release Prep	2010-05-17 15:18:00 -07:00
cred.h	Public Release Prep	2010-05-17 15:18:00 -07:00
ctype.h	Public Release Prep	2010-05-17 15:18:00 -07:00
ddi.h	Public Release Prep	2010-05-17 15:18:00 -07:00
debug.h	Display DEBUG keyword during module load when --enable-debug is used.	2010-07-20 15:31:03 -07:00
dirent.h	Public Release Prep	2010-05-17 15:18:00 -07:00
disp.h	Public Release Prep	2010-05-17 15:18:00 -07:00
dkio.h	Public Release Prep	2010-05-17 15:18:00 -07:00
dklabel.h	Public Release Prep	2010-05-17 15:18:00 -07:00
dnlc.h	Public Release Prep	2010-05-17 15:18:00 -07:00
dumphdr.h	Public Release Prep	2010-05-17 15:18:00 -07:00
efi_partition.h	Public Release Prep	2010-05-17 15:18:00 -07:00
errno.h	Public Release Prep	2010-05-17 15:18:00 -07:00
file.h	Public Release Prep	2010-05-17 15:18:00 -07:00
int_limits.h	Public Release Prep	2010-05-17 15:18:00 -07:00
int_types.h	Public Release Prep	2010-05-17 15:18:00 -07:00
inttypes.h	Public Release Prep	2010-05-17 15:18:00 -07:00
isa_defs.h	Public Release Prep	2010-05-17 15:18:00 -07:00
kidmap.h	Public Release Prep	2010-05-17 15:18:00 -07:00
kmem.h	Stub out kmem cache defrag API	2010-08-27 14:23:42 -07:00
kobj.h	Public Release Prep	2010-05-17 15:18:00 -07:00
kstat.h	Cleanly split Linux proc.h (fs) from conflicting Solaris proc.h (process)	2010-06-11 15:57:25 -07:00
list.h	Add list_link_replace() function	2010-08-27 14:23:48 -07:00
Makefile.in	Build system and packaging (RPM support)	2009-03-09 15:56:55 -07:00
mkdev.h	Public Release Prep	2010-05-17 15:18:00 -07:00
mntent.h	Public Release Prep	2010-05-17 15:18:00 -07:00
modctl.h	Public Release Prep	2010-05-17 15:18:00 -07:00
mode.h	Public Release Prep	2010-05-17 15:18:00 -07:00
mount.h	Public Release Prep	2010-05-17 15:18:00 -07:00
mutex.h	Clear owner after dropping mutex	2010-11-05 11:52:30 -07:00
note.h	Public Release Prep	2010-05-17 15:18:00 -07:00
open.h	Public Release Prep	2010-05-17 15:18:00 -07:00
param.h	Public Release Prep	2010-05-17 15:18:00 -07:00
pathname.h	Public Release Prep	2010-05-17 15:18:00 -07:00
policy.h	Public Release Prep	2010-05-17 15:18:00 -07:00
pool.h	Stub out additional missing headers	2010-06-11 15:57:25 -07:00
priv_impl.h	Stub out additional missing headers	2010-06-11 15:57:25 -07:00
proc.h	Cleanly split Linux proc.h (fs) from conflicting Solaris proc.h (process)	2010-06-11 15:57:25 -07:00
processor.h	Public Release Prep	2010-05-17 15:18:00 -07:00
pset.h	Stub out additional missing headers	2010-06-11 15:57:25 -07:00
random.h	Public Release Prep	2010-05-17 15:18:00 -07:00
refstr.h	Public Release Prep	2010-05-17 15:18:00 -07:00
resource.h	Public Release Prep	2010-05-17 15:18:00 -07:00
rwlock.h	Correctly handle rwsem_is_locked() behavior	2010-08-10 16:43:00 -07:00
sdt.h	Public Release Prep	2010-05-17 15:18:00 -07:00
sid.h	Minor cleanup and Solaris API additions.	2010-06-11 15:57:25 -07:00
signal.h	Split <sys/debug.h> header	2010-07-20 13:29:35 -07:00
stat.h	Public Release Prep	2010-05-17 15:18:00 -07:00
stropts.h	Public Release Prep	2010-05-17 15:18:00 -07:00
sunddi.h	Split <sys/debug.h> header	2010-07-20 13:29:35 -07:00
sunldi.h	Public Release Prep	2010-05-17 15:18:00 -07:00
sysdc.h	Stub out additional missing headers	2010-06-11 15:57:25 -07:00
sysevent.h	Public Release Prep	2010-05-17 15:18:00 -07:00
sysmacros.h	Give ENOTSUP a valid user space error value	2010-11-10 13:25:49 -08:00
systeminfo.h	Public Release Prep	2010-05-17 15:18:00 -07:00
systm.h	Public Release Prep	2010-05-17 15:18:00 -07:00
t_lock.h	Public Release Prep	2010-05-17 15:18:00 -07:00
taskq.h	Implementation of the TQ_FRONT flag.	2010-07-01 10:59:38 -07:00
thread.h	Split <sys/debug.h> header	2010-07-20 13:29:35 -07:00
time.h	Public Release Prep	2010-05-17 15:18:00 -07:00
timer.h	Minor cleanup and Solaris API additions.	2010-06-11 15:57:25 -07:00
types32.h	Public Release Prep	2010-05-17 15:18:00 -07:00
types.h	Add __divdi3(), remove __udivdi3() kernel dependency	2010-07-13 16:44:02 -07:00
u8_textprep.h	Public Release Prep	2010-05-17 15:18:00 -07:00
uio.h	Add xuio_* structures and typedefs.	2010-06-11 15:57:25 -07:00
unistd.h	Public Release Prep	2010-05-17 15:18:00 -07:00
utsname.h	Public Release Prep	2010-05-17 15:18:00 -07:00
va_list.h	Public Release Prep	2010-05-17 15:18:00 -07:00
varargs.h	Public Release Prep	2010-05-17 15:18:00 -07:00
vfs_opreg.h	Public Release Prep	2010-05-17 15:18:00 -07:00
vfs.h	Public Release Prep	2010-05-17 15:18:00 -07:00
vmsystm.h	Public Release Prep	2010-05-17 15:18:00 -07:00
vnode.h	Fix stack overflow in vn_rdwr() due to memory reclaim	2010-08-12 09:34:33 -07:00
zmod.h	Public Release Prep	2010-05-17 15:18:00 -07:00
zone.h	Public Release Prep	2010-05-17 15:18:00 -07:00