FreeBSD Architecture Handbook
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2.2 Shared Exclusive Locks

These locks provide basic reader-writer type functionality and may be held by a sleeping process. Currently they are backed by lockmgr(9).

Table 2-2. Shared Exclusive Lock List

Variable Name	Protectees
`allproc_lock`	`allproc` `zombproc` `pidhashtbl` `proc`.`p_list` `proc`.`p_hash` `nextpid`
`proctree_lock`	`proc`.`p_children` `proc`.`p_sibling`

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