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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<HTML>
+<HEAD>
+ <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
+ <TITLE>&quot;PTHREAD_RWLOCK_DESTROY&quot;(P) manual page</TITLE>
+ <META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)">
+ <META NAME="CREATED" CONTENT="20050505;10211800">
+ <META NAME="CHANGED" CONTENT="20050505;18563400">
+ <!-- manual page source format generated by PolyglotMan v3.2, -->
+ <!-- available at http://polyglotman.sourceforge.net/ -->
+</HEAD>
+<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
+<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
+<P><A HREF="index.html">Reference Index</A></P>
+<P><A HREF="#toc">Table of Contents</A></P>
+<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
+<P>pthread_rwlock_destroy, pthread_rwlock_init - destroy and
+initialize a read-write lock object
+</P>
+<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
+<P><B>#include &lt;pthread.h&gt; </B>
+</P>
+<P><B>pthread_wrlock_t </B><I>rwlock</I> <B>=
+PTHREAD_RWLOCK_INITIALIZER;</B></P>
+<P><B>int pthread_rwlock_destroy(pthread_rwlock_t *</B><I>rwlock</I><B>);
+<BR>int pthread_rwlock_init(pthread_rwlock_t *restrict</B> <I>rwlock</I><B>,
+const pthread_rwlockattr_t *restrict</B> <I>attr</I><B>); </B>
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>The <B>pthread_rwlock_destroy</B> function shall destroy the
+read-write lock object referenced by <I>rwlock</I> and release any
+resources used by the lock. The effect of subsequent use of the lock
+is undefined until the lock is reinitialized by another call to
+<B>pthread_rwlock_init</B>. An implementation may cause
+<B>pthread_rwlock_destroy</B> to set the object referenced by <I>rwlock</I>
+to an invalid value. Results are undefined if <B>pthread_rwlock_destroy</B>
+is called when any thread holds <I>rwlock</I>. Attempting to destroy
+an uninitialized read-write lock results in undefined behavior.
+</P>
+<P>The <B>pthread_rwlock_init</B> function shall allocate any
+resources required to use the read-write lock referenced by <I>rwlock</I>
+and initializes the lock to an unlocked state with attributes
+referenced by <I>attr</I>. If <I>attr</I> is NULL, the default
+read-write lock attributes shall be used; the effect is the same as
+passing the address of a default read-write lock attributes object.
+Once initialized, the lock can be used any number of times without
+being reinitialized. Results are undefined if <B>pthread_rwlock_init</B>
+is called specifying an already initialized read-write lock. Results
+are undefined if a read-write lock is used without first being
+initialized.
+</P>
+<P>If the <B>pthread_rwlock_init</B> function fails, <I>rwlock</I>
+shall not be initialized and the contents of <I>rwlock</I> are
+undefined.
+</P>
+<P><B>Pthreads-w32</B> supports statically initialized <I>rwlock</I>
+objects using <B>PTHREAD_RWLOCK_INITIALIZER</B>. <SPAN STYLE="font-weight: medium">
+An application should still call <B>pthread_rwlock_destroy</B> at
+some point to ensure that any resources consumed by the read/write
+lock are released.</SPAN></P>
+<P>Only the object referenced by <I>rwlock</I> may be used for
+performing synchronization. The result of referring to copies of that
+object in calls to <B>pthread_rwlock_destroy</B> ,
+<B>pthread_rwlock_rdlock</B> , <B>pthread_rwlock_timedrdlock</B> ,
+<B>pthread_rwlock_timedwrlock</B> , <B>pthread_rwlock_tryrdlock</B> ,
+<B>pthread_rwlock_trywrlock</B> , <B>pthread_rwlock_unlock</B> , or
+<B>pthread_rwlock_wrlock</B> is undefined.
+</P>
+<P><B>Pthreads-w32</B> defines <B>_POSIX_READER_WRITER_LOCKS</B> in
+pthread.h as 200112L to indicate that the reader/writer routines are
+implemented and may be used.</P>
+<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
+<P>If successful, the <B>pthread_rwlock_destroy</B> and
+<B>pthread_rwlock_init</B> functions shall return zero; otherwise, an
+error number shall be returned to indicate the error.
+</P>
+<P>The [EBUSY] and [EINVAL] error checks, if implemented, act as if
+they were performed immediately at the beginning of processing for
+the function and caused an error return prior to modifying the state
+of the read-write lock specified by <I>rwlock</I>.
+</P>
+<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
+<P>The <B>pthread_rwlock_destroy</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EBUSY</B>
+ </DT><DD>
+ The implementation has detected an attempt to destroy the object
+ referenced by <I>rwlock</I> while it is locked.
+ </DD><DT>
+ <B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The value specified by <I>rwlock</I> is invalid.
+ </DD></DL>
+<P>
+The <B>pthread_rwlock_init</B> function shall fail if:
+</P>
+<DL>
+ <DT><B>EAGAIN</B>
+ </DT><DD>
+ The system lacked the necessary resources (other than memory) to
+ initialize another read-write lock.
+ </DD><DT>
+ <B>ENOMEM</B>
+ </DT><DD>
+ Insufficient memory exists to initialize the read-write lock.
+ </DD><DD STYLE="margin-left: 0cm; margin-bottom: 0.5cm">
+ <BR><BR>
+ </DD></DL>
+<P>
+The <B>pthread_rwlock_init</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The value specified by <I>attr</I> is invalid.
+ </DD></DL>
+<P>
+These functions shall not return an error code of [EINTR].
+</P>
+<P><I>The following sections are informative.</I>
+</P>
+<H2><A HREF="#toc5" NAME="sect5">Examples</A></H2>
+<P>None.
+</P>
+<H2><A HREF="#toc6" NAME="sect6">Application Usage</A></H2>
+<P>Applications using these and related read-write lock functions may
+be subject to priority inversion, as discussed in the Base
+Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001, Section 3.285,
+Priority Inversion.
+</P>
+<H2><A HREF="#toc7" NAME="sect7">Rationale</A></H2>
+<P>None.
+</P>
+<H2><A HREF="#toc8" NAME="sect8">Future Directions</A></H2>
+<P>None.
+</P>
+<H2><A HREF="#toc9" NAME="sect9">See Also</A></H2>
+<P><A HREF="pthread_rwlock_rdlock.html"><B>pthread_rwlock_rdlock</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_timedrdlock.html"><B>pthread_rwlock_timedrdlock</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_timedwrlock.html"><B>pthread_rwlock_timedwrlock</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_rdlock.html"><B>pthread_rwlock_tryrdlock</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_wrlock.html"><B>pthread_rwlock_trywrlock</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_unlock.html"><B>pthread_rwlock_unlock</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_wrlock.html"><B>pthread_rwlock_wrlock</B>(3)</A>
+<B>,</B> the Base Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001,
+<I>&lt;pthread.h&gt;</I>
+</P>
+<H2><A HREF="#toc10" NAME="sect10">Copyright</A></H2>
+<P>Portions of this text are reprinted and reproduced in electronic
+form from IEEE Std 1003.1, 2003 Edition, Standard for Information
+Technology -- Portable Operating System Interface (POSIX), The Open
+Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the
+Institute of Electrical and Electronics Engineers, Inc and The Open
+Group. In the event of any discrepancy between this version and the
+original IEEE and The Open Group Standard, the original IEEE and The
+Open Group Standard is the referee document. The original Standard
+can be obtained online at <A HREF="http://www.opengroup.org/unix/online.html">http://www.opengroup.org/unix/online.html</A>
+.
+</P>
+<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P>
+<HR>
+<P><A NAME="toc"></A><B>Table of Contents</B></P>
+<UL>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Return
+ Value</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Examples</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Application
+ Usage</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Rationale</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Future
+ Directions</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">See
+ Also</A>
+ </P>
+ <LI><P><A HREF="#sect10" NAME="toc10">Copyright</A>
+ </P>
+</UL>
+</BODY>
+</HTML>