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diff --git a/doc/ck_pflock b/doc/ck_pflock new file mode 100644 index 0000000..6fea701 --- /dev/null +++ b/doc/ck_pflock @@ -0,0 +1,95 @@ +.\" +.\" 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_pflock 3 +.Sh NAME +.Nm ck_pflock_init , +.Nm ck_pflock_write_lock , +.Nm ck_pflock_write_unlock , +.Nm ck_pflock_read_lock , +.Nm ck_pflock_read_unlock , +.Nd centralized phase-fair reader-writer locks +.Sh LIBRARY +Concurrency Kit (libck, \-lck) +.Sh SYNOPSIS +.In ck_pflock.h +.Pp +.Dv ck_pflock_t lock = CK_PFLOCK_INITIALIZER; +.Pp +.Ft void +.Fn ck_pflock_init "ck_pflock_t *lock" +.Ft void +.Fn ck_pflock_write_lock "ck_pflock_t *lock" +.Ft void +.Fn ck_pflock_write_unlock "ck_pflock_t *lock" +.Ft void +.Fn ck_pflock_read_lock "ck_pflock_t *lock" +.Ft void +.Fn ck_pflock_read_unlock "ck_pflock_t *lock" +.Sh DESCRIPTION +This is a centralized phase-fair reader-writer lock. It +requires little space overhead and has a low latency +fast path. +.Sh EXAMPLE +.Bd -literal -offset indent +#include <ck_pflock.h> + +static ck_pflock_t lock = CK_TFLOCK_INITIALIZER; + +static void +reader(void) +{ + + for (;;) { + ck_pflock_read_lock(&lock); + /* Read-side critical section. */ + ck_pflock_read_unlock(&lock); + } + + return; +} + +static void +writer(void) +{ + + for (;;) { + ck_pflock_write_lock(&lock); + /* Write-side critical section. */ + ck_pflock_write_unlock(&lock); + } + + return; +} +.Ed +.Sh SEE ALSO +.Xr ck_brlock 3 , +.Xr ck_rwlock 3 , +.Xr ck_tflock 3 , +.Xr ck_swlock 3 +.Pp +Additional information available at http://concurrencykit.org/ |