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| author | rpj <rpj> | 2005-05-06 07:27:10 +0000 |
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| committer | rpj <rpj> | 2005-05-06 07:27:10 +0000 |
| commit | 7523c7c4d75652f67cd31cb123e1268790394c8b (patch) | |
| tree | 0920ebf089ccb971e0878542f85486171a541a8a /manual/pthread_rwlock_timedrdlock.html | |
| parent | cf42850c77554311e62d3780f6a36cbc38e5e002 (diff) | |
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diff --git a/manual/pthread_rwlock_timedrdlock.html b/manual/pthread_rwlock_timedrdlock.html new file mode 100644 index 0000000..1b9ca63 --- /dev/null +++ b/manual/pthread_rwlock_timedrdlock.html @@ -0,0 +1,156 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<HTML> +<HEAD> + <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8"> + <TITLE>"PTHREAD_RWLOCK_TIMEDRDLOCK"(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 <pthread.h> <BR></B>#include <time.h> +</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><time.h></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 Std 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 Std 1003.1-2001, +<I><pthread.h></I>, <I><time.h></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> |