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-.\" Copyright (c) 1998 Alex Nash
-.\" 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 AUTHOR 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 AUTHOR 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd August 4, 1998
-.Dt PTHREAD_RWLOCK_RDLOCK 3
-.Os
-.Sh NAME
-.Nm pthread_rwlock_rdlock ,
-.Nm pthread_rwlock_tryrdlock
-.Nd acquire a read/write lock for reading
-.Sh LIBRARY
-.Lb libc_r
-.Sh SYNOPSIS
-.In pthread.h
-.Ft int
-.Fn pthread_rwlock_rdlock "pthread_rwlock_t *lock"
-.Ft int
-.Fn pthread_rwlock_tryrdlock "pthread_rwlock_t *lock"
-.Sh DESCRIPTION
-The
-.Fn pthread_rwlock_rdlock
-function acquires a read lock on
-.Fa lock
-provided that
-.Fa lock
-is not presently held for writing and no writer threads are
-presently blocked on the lock.  If the read lock cannot be
-immediately acquired, the calling thread blocks until it can
-acquire the lock.
-.Pp
-The
-.Fn pthread_rwlock_tryrdlock
-function performs the same action, but does not block if the lock
-cannot be immediately obtained (i.e. the lock is held for writing
-or there are waiting writers).
-.Pp
-A thread may hold multiple concurrent read locks.  If so,
-.Fn pthread_rwlock_unlock
-must be called once for each lock obtained.
-.Pp
-The results of acquiring a read lock while the calling thread holds
-a write lock are undefined.
-.Sh IMPLEMENTATION NOTES
-To prevent writer starvation, writers are favored over readers.
-.Sh RETURN VALUES
-If successful, the
-.Fn pthread_rwlock_rdlock
-and
-.Fn pthread_rwlock_tryrdlock
-functions will return zero.  Otherwise an error number will be returned
-to indicate the error.
-.Sh SEE ALSO
-.Xr pthread_rwlock_init 3 ,
-.Xr pthread_rwlock_trywrlock 3 ,
-.Xr pthread_rwlock_unlock 3 ,
-.Xr pthread_rwlock_wrlock 3
-.Sh STANDARDS
-The
-.Fn pthread_rwlock_rdlock
-and
-.Fn pthread_rwlock_tryrdlock
-functions are expected to conform to
-.St -susv2 .
-.Sh ERRORS
-The
-.Fn pthread_rwlock_tryrdlock
-function will fail if:
-.Bl -tag -width Er
-.It Bq Er EBUSY
-The lock could not be acquired because a writer holds the lock or
-was blocked on it.
-.El
-.Pp
-The
-.Fn pthread_rwlock_rdlock
-and
-.Fn pthread_rwlock_tryrdlock
-functions may fail if:
-.Bl -tag -width Er
-.It Bq Er EAGAIN
-The lock could not be acquired because the maximum number of read locks
-against
-.Fa lock
-has been exceeded.
-.It Bq Er EDEADLK
-The current thread already owns
-.Fa lock
-for writing.
-.It Bq Er EINVAL
-The value specified by
-.Fa lock
-is invalid.
-.It Bq Er ENOMEM
-Insufficient memory exists to initialize the lock (applies to
-statically initialized locks only).
-.El
-.Sh HISTORY
-The
-.Fn pthread_rwlock_rdlock
-function first appeared in
-.Fx 3.0 .