doc: Add ck_tflock manual page.

doc/Makefile.in

@@ -148,6 +148,7 @@ OBJECTS=CK_ARRAY_FOREACH		\
 	ck_ring_enqueue_spsc_size	\
 	ck_ring_size			\
 	ck_ring_capacity		\
+	ck_tflock			\
 	ck_rwlock			\
 	ck_sequence			\
 	ck_spinlock

doc/ck_tflock

@@ -0,0 +1,96 @@
+.\"
+.\" Copyright 2014 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
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" 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
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"
+.Dd April 22, 2014.
+.Dt ck_tflock 3
+.Sh NAME
+.Nm ck_tflock_ticket_init ,
+.Nm ck_tflock_ticket_write_lock ,
+.Nm ck_tflock_ticket_write_unlock ,
+.Nm ck_tflock_ticket_read_lock ,
+.Nm ck_tflock_ticket_read_unlock ,
+.Nd centralized task-fair reader-writer locks
+.Sh LIBRARY
+Concurrency Kit (libck, \-lck)
+.Sh SYNOPSIS
+.In ck_tflock.h
+.Pp
+.Dv ck_tflock_ticket_t lock = CK_TFLOCK_TICKET_INITIALIZER;
+.Pp
+.Ft void
+.Fn ck_tflock_ticket_init "ck_tflock_ticket_t *lock"
+.Ft void
+.Fn ck_tflock_ticket_write_lock "ck_tflock_ticket_t *lock"
+.Ft void
+.Fn ck_tflock_ticket_write_unlock "ck_tflock_ticket_t *lock"
+.Ft void
+.Fn ck_tflock_ticket_read_lock "ck_tflock_ticket_t *lock"
+.Ft void
+.Fn ck_tflock_ticket_read_unlock "ck_tflock_ticket_t *lock"
+.Sh DESCRIPTION
+This is a centralized task-fair reader-writer lock. It
+requires little space overhead and has a low latency
+fast path.
+.Sh EXAMPLE
+.Bd -literal -offset indent
+#include <ck_tflock.h>
+
+static ck_tflock_ticket_t lock = CK_TFLOCK_INITIALIZER;
+
+static void
+reader(void)
+{
+
+	for (;;) {
+		ck_tflock_ticket_read_lock(&lock);
+		/* Read-side critical section. */
+		ck_tflock_ticket_read_unlock(&lock);
+	}
+
+	return;
+}
+
+static void
+writer(void)
+{
+
+	for (;;) {
+		ck_tflock_ticket_write_lock(&lock);
+		/* Write-side critical section. */
+		ck_tflock_ticket_write_unlock(&lock);
+	}
+
+	return;
+}
+.Ed
+.Sh SEE ALSO
+.Xr ck_brlock 3 ,
+.Xr ck_elide 3 ,
+.Xr ck_rwlock 3 ,
+.Xr ck_pflock 3 ,
+.Xr ck_swlock 3
+.Pp
+Additional information available at http://concurrencykit.org/