On Tuesday, December 4, 2001, at 04:58 AM, Francis Bouchard wrote: In IOLocks.h I can see this: #ifndef IOKIT_DEPRECATED #define IOKIT_DEPRECATED 1 #endif Does that means I shouldn't use it ? Yes... but it applies only to the stuff wrapped with IOKIT_DEPRECATED. Look around in the IOLocks.h header. Only the following are deprecated, everything else you should be able to use (IOSyncer and others heavily utilize the stuff defined in IOLocks). #if IOKIT_DEPRECATED /* The following API is deprecated */ typedef enum { kIOLockStateUnlocked = 0, kIOLockStateLocked = 1, } IOLockState; void IOLockInitWithState( IOLock * lock, IOLockState state); #define IOLockInit( l ) IOLockInitWithState( l, kIOLockStateUnlocked); static __inline__ void IOTakeLock( IOLock * lock) { IOLockLock(lock); } static __inline__ boolean_t IOTryLock( IOLock * lock) { return(IOLockTryLock(lock)); } static __inline__ void IOUnlock( IOLock * lock) { IOLockUnlock(lock); } #endif /* IOKIT_DEPRECATED */ #if IOKIT_DEPRECATED /* The following API is deprecated */ static __inline__ void IOReadLock( IORWLock * lock) { IORWLockRead(lock); } static __inline__ void IOWriteLock( IORWLock * lock) { IORWLockWrite(lock); } static __inline__ void IORWUnlock( IORWLock * lock) { IORWLockUnlock(lock); } #endif /* IOKIT_DEPRECATED */