DupLock

Duplicate a Lock

DupLock() is passed a shared file system Lock. This is the ONLY way to obtain a duplicate of a Lock... merely copying the pointer to the Lock is not allowed.

Another Lock to the same object is then returned. It is not possible to create a copy of an exclusive Lock.

lock

BCPL pointer to a Lock to be duplicated.

DupLock() may show unpredictable behaviour if the ChangeMode() function was used with a mode which is none of SHARED_LOCK or EXCLUSIVE_LOCK.

duplicated_lock

BCPL pointer to a Lock. A zero return indicates failure. Call IoErr() to find out why DupLock() failed.

Lock(), UnLock(), DupLockFromFH(), ParentOfFH(), ChangeMode()