Documentation/locking/seqlock.rst

8 Sequence counters are a reader-writer consistency mechanism with
9 lockless readers (read-only retry loops), and no writer starvation. They
30 interrupted writer. If that reader belongs to a real-time scheduling
33 This mechanism cannot be used if the protected data contains pointers,
53 requirements of writer serialization and non-preemptibility, use
76 	/* ... [[write-side critical section]] ... */
85 		/* ... [[read-side critical section]] ... */
93 -----------------------------------------------------------------
96 sections must be serialized and non-preemptible. This variant of
105 that it is properly protected.
112   - ``seqcount_spinlock_t``
113   - ``seqcount_raw_spinlock_t``
114   - ``seqcount_rwlock_t``
115   - ``seqcount_mutex_t``
116   - ``seqcount_ww_mutex_t``
145 ----------------------------------------------
149 between two copies of protected data. This allows the sequence counter
152 Use seqcount_latch_t when the write side sections cannot be protected
165 embedded spinlock for writer serialization and non-preemptibility.
189 	/* ... [[write-side critical section]] ... */
202 		/* ... [[read-side critical section]] ... */
213 	/* ... [[read-side critical section]] ... */
230 		/* ... [[read-side critical section]] ... */
239 .. kernel-doc:: include/linux/seqlock.h