jhb 2007-03-09 16:27:11 UTC
FreeBSD src repository
Modified files:
sys/kern kern_lock.c kern_mutex.c kern_rwlock.c
kern_sx.c
sys/sys lock.h
Log:
Add two new function pointers 'lc_lock' and 'lc_unlock' to lock classes.
These functions are intended to be used to drop a lock and then reacquire
it when doing an sleep such as msleep(9). Both functions accept a
'struct lock_object *' as their first parameter. The 'lc_unlock' function
returns an integer that is then passed as the second paramter to the
subsequent 'lc_lock' function. This can be used to communicate state.
For example, sx locks and rwlocks use this to indicate if the lock was
share/read locked vs exclusive/write locked.
Currently, spin mutexes and lockmgr locks do not provide working lc_lock
and lc_unlock functions.
Revision Changes Path
1.106 +19 -3 src/sys/kern/kern_lock.c
1.185 +40 -0 src/sys/kern/kern_mutex.c
1.18 +33 -0 src/sys/kern/kern_rwlock.c
1.38 +33 -0 src/sys/kern/kern_sx.c
1.65 +9 -0 src/sys/sys/lock.h
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