Cosmetic fixes.
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@ -76,9 +76,9 @@ threads (including interrupt threads), and releases (unlocks) it afterwards.
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If the mutex cannot be acquired, the thread requesting it will sleep.
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Mutexes fully support priority propagation.
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.Pp
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See the
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See
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.Xr mutex 9
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page for more information.
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for details.
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.Ss Spin mutexes
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Spin mutexes are variation of basic mutexes; the main difference between
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the two is that spin mutexes never sleep - instead, they spin, waiting
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@ -100,9 +100,9 @@ a pool mutex, one uses address of the structure being protected with it,
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not the mutex itself.
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Pool mutexes are seldom used.
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.Pp
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See the
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See
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.Xr mtx_pool 9
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page for more information.
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for details.
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.Ss Reader/writer locks
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Reader/writer locks allow shared access to protected data by multiple threads,
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or exclusive access by a single thread.
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@ -131,9 +131,9 @@ can recurse, but exclusive locks are not allowed to recurse.
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This ability should not be used lightly and
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.Em may go away.
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.Pp
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See the
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See
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.Xr rwlock 9
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page for more information.
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for details.
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.Ss Read-mostly locks
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Mostly reader locks are similar to
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.Em reader/writer
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@ -144,9 +144,9 @@ using a lock user supplied
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.Em tracker
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data structure.
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.Pp
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See the
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See
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.Xr rmlock 9
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page for more information.
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for details.
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.Ss Shared/exclusive locks
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Shared/exclusive locks are similar to reader/writer locks; the main difference
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between them is that shared/exclusive locks may be held during unbounded sleep
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@ -158,9 +158,9 @@ They should be considered to be closely related to
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In fact it could in some cases be
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considered a conditional sleep.
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.Pp
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See the
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See
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.Xr sx 9
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page for more information.
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for details.
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.Ss Counting semaphores
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Counting semaphores provide a mechanism for synchronizing access
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to a pool of resources.
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@ -169,9 +169,9 @@ so they can be useful in situations where one thread needs
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to acquire a resource, and another thread needs to release it.
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They are largely deprecated.
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.Pp
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See the
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See
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.Xr sema 9
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page for more information.
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for details.
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.Ss Condition variables
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Condition variables are used in conjunction with mutexes to wait for
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conditions to occur.
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@ -182,9 +182,9 @@ When a thread waits on a condition, the mutex
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is atomically released before the thread is blocked, then reacquired
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before the function call returns.
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.Pp
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See the
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See
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.Xr condvar 9
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page for more information.
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for details.
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.Ss Giant
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Giant is an instance of a mutex, with some special characteristics:
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.Bl -enum
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@ -262,9 +262,9 @@ while the thread is suspended and will reacquire the
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.Va Giant
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mutex before the function returns.
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.Pp
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See the
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See
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.Xr sleep 9
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page for more information.
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for details.
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.Pp
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.Ss Lockmanager locks
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Shared/exclusive locks, used mostly in
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@ -276,9 +276,9 @@ They have features other lock types don't have, such as sleep timeout,
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writer starvation avoidance, draining, and interlock mutex, but this makes them
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complicated to implement; for this reason, they are deprecated.
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.Pp
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See the
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See
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.Xr lock 9
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page for more information.
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for details.
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.Sh INTERACTIONS
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.Ss Bounded vs. unbounded sleep
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The following primitives perform bounded sleep: mutexes, pool mutexes,
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@ -325,7 +325,7 @@ one of the synchronization primitives discussed here:
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.Xc
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.It Ic spin mtx Ta \&ok-1 Ta \&no Ta \&no Ta \&no Ta \&no Ta \&no-3
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.It Ic mutex Ta \&ok Ta \&ok-1 Ta \&no Ta \&ok Ta \&ok Ta \&no-3
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.It Ic sxlock Ta \&ok Ta \&ok Ta \&ok-2 Ta \&ok Ta \&ok Ta \&ok-4
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.It Ic sx Ta \&ok Ta \&ok Ta \&ok-2 Ta \&ok Ta \&ok Ta \&ok-4
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.It Ic rwlock Ta \&ok Ta \&ok Ta \&no Ta \&ok-2 Ta \&ok Ta \&no-3
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.It Ic rmlock Ta \&ok Ta \&ok Ta \&no Ta \&ok Ta \&ok-2 Ta \&no
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.El
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