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+.\"Copyright (c) 2010 Novell Inc., written by Robert Schweikert
+.\"   <mtk.manpages@gmail.com>
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.TH PTHREAD_RWLOCKATTR_SETKIND_NP 3 2010-06-09 "Linux Programmer's Manual"
+.SH NAME
+pthread_rwlockattr_setkind_np, pthread_rwlockattr_getkind_np \- set/get 
+the read-write lock kind of the thread read-write lock attribute object
+.SH SYNOPSIS
+.nf
+.B #define _XOPEN_SOURCE 500
+.B #include <pthread.h>
+
+.BI "int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *" attr ,
+.BI "                                   int" pref);
+.BI "int pthread_rwlockattr_getkind_np (const pthread_rwlockattr_t *" attr ,
+.BI "                                   int *" pref);
+.sp
+Compile and link with \fI\-pthread\fP.
+.SH DESCRIPTION
+The
+.BR pthread_rwlockattr_setkind_np ()
+function
+sets the kind of read-write lock of the
+thread read-write lock attribute object referred to by
+.I attr
+to the value specified with 
+.IR pref .
+The argument
+.I pref
+may be set to
+.IR PTHREAD_RWLOCK_PREFER_READER_NP , 
+.IR PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP ,
+or
+.IR  PTHREAD_RWLOCK_PREFER_WRITER_NP .
+The default lock setting is
+.IR PTHREAD_RWLOCK_PREFER_READER_NP .
+A thread may hold multiple read locks, i.e. read locks are recursive. 
+According to The Single Unix Specification, the behavior is unspecified when a
+reader tries to place a lock, and there is no write lock but writers are
+waiting. Giving preference to the reader, as is set by default with the
+.IR PTHREAD_RWLOCK_PREFER_READER_NP value
+implies that the reader will receive the requested lock, even if
+a writer is waiting. As long as there are readers the writer will be
+starved. Setting the kind to 
+.IR PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP ,
+avoids writer starvation as long as any read locking is not done in a
+recursive fashion.
+
+The
+.BR pthread_rwlockattr_getkind_np ()
+function
+returns the value of the read-write lock attribute of the
+thread read-write lock attribute object referred to by
+.IR attr
+in the pointer
+.IR pref .
+.SH RETURN VALUE
+On success, these functions return 0;
+on error,
+.BR pthread_rwlockattr_setkind_np ()
+returns a non-zero error number.
+.SH ERRORS
+.TP
+.BR EINVAL
+.I pref
+is set to an unsupported value.
+.SH BUGS
+Setting the value read-write lock kind to
+.IR  PTHREAD_RWLOCK_PREFER_WRITER_NP ,
+results in the same behavior as setting the value to
+.IR PTHREAD_RWLOCK_PREFER_READER_NP .
+As long as a reader thread holds the lock the thread holding a 
+write lock will be starved. Setting the kind value to
+.IR PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP ,
+allows the writer to run. However, the writer may not be
+recursive as is implied by the name. See
+http://sourceware.org/bugzilla/show_bug.cgi?id=7057
+.SH CONFORMING TO
+These functions are non-standard GNU extensions;
+hence the suffix "_np" (non-portable) in the names.
+.SH SEE ALSO
+.BR pthreads (7)