lockfile function to avoid a deadlock. The lockCount field of PRFilePrivate may have the value of -1 to indicate that the MD lockfile function is in progress. Use _pr_flock_cv to wait for the completion of the MD lockfile function. Modified files: primpl.h, prfile.c, prio.c, ptio.c git-svn-id: svn://10.0.0.236/trunk@88070 18797224-902f-48f8-a5cc-f745e15eee43