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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <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_TIMEDRDLOCK&quot;(P) manual page</TITLE>
+ <META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)">
+ <META NAME="CREATED" CONTENT="20050505;11101700">
+ <META NAME="CHANGED" CONTENT="20050505;12560000">
+ <!-- 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_timedrdlock - lock a read-write lock for reading
+</P>
+<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
+<P><B>#include &lt;pthread.h&gt; <BR></B>#include &lt;time.h&gt;
+</P>
+<P><B>int pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict</B>
+<I>rwlock</I><B>, const struct timespec *restrict</B> <I>abs_timeout</I><B>);
+</B>
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>The <B>pthread_rwlock_timedrdlock</B> function shall apply a read
+lock to the read-write lock referenced by <I>rwlock</I> as in the
+<A HREF="pthread_rwlock_rdlock.html"><B>pthread_rwlock_rdlock</B>(3)</A>
+function. However, if the lock cannot be acquired without waiting for
+other threads to unlock the lock, this wait shall be terminated when
+the specified timeout expires. The timeout shall expire when the
+absolute time specified by <I>abs_timeout</I> passes, as measured by
+the clock on which timeouts are based (that is, when the value of
+that clock equals or exceeds <I>abs_timeout</I>), or if the absolute
+time specified by <I>abs_timeout</I> has already been passed at the
+time of the call.
+</P>
+<P>The <B>timespec</B> data type is defined in the <I>&lt;time.h&gt;</I>
+header. Under no circumstances shall the function fail with a timeout
+if the lock can be acquired immediately. The validity of the
+<I>abs_timeout</I> parameter need not be checked if the lock can be
+immediately acquired.
+</P>
+<P>The calling thread may deadlock if at the time the call is made it
+holds a write lock on <I>rwlock</I>. The results are undefined if
+this function is called with an uninitialized read-write lock.
+</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>The <B>pthread_rwlock_timedrdlock</B> function shall return zero
+if the lock for reading on the read-write lock object referenced by
+<I>rwlock</I> is acquired. Otherwise, an error number shall be
+returned to indicate the error.
+</P>
+<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
+<P>The <B>pthread_rwlock_timedrdlock</B> function shall fail if:
+</P>
+<DL>
+ <DT><B>ETIMEDOUT</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The lock could not be acquired before the specified timeout expired.
+ </DD></DL>
+<P>
+The <B>pthread_rwlock_timedrdlock</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EAGAIN</B>
+ </DT><DD>
+ The read lock could not be acquired because the maximum number of
+ read locks for lock would be exceeded.
+ </DD><DT>
+ <B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The value specified by <I>rwlock</I> does not refer to an
+ initialized read-write lock object, or the <I>abs_timeout</I>
+ nanosecond value is less than zero or greater than or equal to 1000
+ million.
+ </DD></DL>
+<P>
+This function 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 this function 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_init.html"><B>pthread_rwlock_destroy</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlock_rdlock.html"><B>pthread_rwlock_rdlock</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>, <I>&lt;time.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>