Fix PR1826. tsleep in lf_setlock can return 0 if process was ptrace'd,

but not wakeup'ed. In this case one entry can be placed twice at list of
blocked locks. As a result block list contain an entry which points to
itself. lf_wakelock can't remove such an entry and system livelocks
trying to remove a bad entry from block list.

Other changes include:
 - repair debug functions and make vfs_lockf.c compilable with LOCKF_DEBUG
 - simplify debug printing and remove useless debugging
 - remove unnecessary casting, replace NOLOCKF with NULL
 - free -> FREE (use one form over the file)
 - convert list of blocked locks to use TAILQ_* macroses
 - lf_addblock() -> TAILQ_INSERT_TAIL
 - Fix bug in lf_findoverlap(): in old code
   if (end == -1) && (lf->lf_end == -1) && (lf->lf_start <= start)
   then lf_findoverlap() return 4 instead of 2
 - work more carefully with pointers (probably fix one or two bugs)
 - use wakeup_one()
 - KNF

0 files changed, 0 insertions, 0 deletions