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-.\"
-.\" Copyright 2013 Samy Al Bahra.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-.Dd July 26, 2013.
-.Dt ck_brlock 3
-.Sh NAME
-.Nm ck_brlock_init ,
-.Nm ck_brlock_write_lock ,
-.Nm ck_brlock_write_unlock ,
-.Nm ck_brlock_write_trylock ,
-.Nm ck_brlock_read_register ,
-.Nm ck_brlock_read_unregister ,
-.Nm ck_brlock_read_lock ,
-.Nm ck_brlock_read_trylock ,
-.Nm ck_brlock_read_unlock
-.Nd big-reader locks
-.Sh LIBRARY
-Concurrency Kit (libck, \-lck)
-.Sh SYNOPSIS
-.In ck_brlock.h
-.Pp
-.Dv ck_brlock_t brlock = CK_BRLOCK_INITIALIZER;
-.Pp
-.Dv ck_brlock_reader_t reader = CK_BRLOCK_READER_INITIALIZER;
-.Pp
-.Ft void
-.Fn ck_brlock_init "ck_brlock_t *br"
-.Ft void
-.Fn ck_brlock_write_lock "ck_brlock_t *br"
-.Ft void
-.Fn ck_brlock_write_unlock "ck_brlock_t *br"
-.Ft bool
-.Fn ck_brlock_write_trylock "ck_brlock_t *br" "unsigned int factor"
-.Ft void
-.Fn ck_brlock_read_register "ck_brlock_t *br" "ck_brlock_reader_t *reader"
-.Ft void
-.Fn ck_brlock_read_unregister "ck_brlock_t *br" "ck_brlock_reader_t *reader"
-.Ft void
-.Fn ck_brlock_read_lock "ck_brlock_t *br" "ck_brlock_reader_t *reader"
-.Ft bool
-.Fn ck_brlock_read_trylock "ck_brlock_t *br" "ck_brlock_reader_t *reader" \
-"unsigned int factor"
-.Ft void
-.Fn ck_brlock_read_unlock "ck_brlock_reader_t *reader"
-.Sh DESCRIPTION
-Big reader locks are distributed reader-writer locks with low latency constant time
-reader acquisition (with respect to number of concurrent readers). On the other
-hand, writer acquisitions are a relatively expensive O(n) operation. This is a write-biased
-lock.
-.Sh EXAMPLE
-.Bd -literal -offset indent
-static ck_brlock_t lock = CK_BRLOCK_INITIALIZER;
-static __thread ck_brlock_reader_t reader;
-
-static void
-reader(void)
-{
-
-	/* Add our thread as a lock participant. */
-	ck_brlock_read_register(&lock, &reader);
-
-	for (;;) {
-		ck_brlock_read_lock(&lock, &reader);
-		/* Read-side critical section. */
-		ck_brlock_read_unlock(&reader);
-
-		if (ck_brlock_read_trylock(&lock, &reader, 1) == true) {
-			/* Read-side critical section. */
-			ck_brlock_read_unlock(&reader);
-		}
-	}
-
-	return;
-}
-
-static void
-writer(void)
-{
-
-	for (;;) {
-		ck_brlock_write_lock(&lock);
-		/* Write-side critical section. */
-		ck_brlock_write_unlock(&lock);
-
-		if (ck_brlock_write_trylock(&lock, 1) == true) {
-			/* Write-side critical section. */
-			ck_brlock_write_unlock(&lock);
-		}
-	}
-
-	return;
-}
-.Ed
-.Sh SEE ALSO
-.Xr ck_bytelock 3 ,
-.Xr ck_rwlock 3
-.Pp
-Additional information available at http://concurrencykit.org/