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/freebsd-10.2-release/sys/dev/pty/
H A Dpty.cdiff 94860 Tue Apr 16 17:09:22 MDT 2002 jhb - Lock proctree_lock instead of pgrpsess_lock.
- Use temporary variables to hold a pointer to a pgrp while we dink with it
while not holding either the associated proc lock or proctree_lock. It
is in theory possible that p->p_pgrp could change out from under us.
/freebsd-10.2-release/sys/kern/
H A Dtty.cdiff 94860 Tue Apr 16 17:09:22 MDT 2002 jhb - Lock proctree_lock instead of pgrpsess_lock.
- Use temporary variables to hold a pointer to a pgrp while we dink with it
while not holding either the associated proc lock or proctree_lock. It
is in theory possible that p->p_pgrp could change out from under us.

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