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| <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 STYLE="font-weight: medium">pthread_timechange_handler_np – | |
| alert timed waiting condition variables to system time changes.</P> | |
| <H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2> | |
| <P><B>#include <pthread.h></B> | |
| </P> | |
| <P><B>void * pthread_timechange_handler_np(void * </B><I>dummy</I><B>);</B></P> | |
| <H2><A HREF="#toc2" NAME="sect2">Description</A></H2> | |
| <P>To improve tolerance against operator or time service initiated | |
| system clock changes.</P> | |
| <P><B>pthread_timechange_handler_np </B>can be called by an | |
| application when it receives a WM_TIMECHANGE message from the system. | |
| At present it broadcasts all condition variables so that waiting | |
| threads can wake up and re-evaluate their conditions and restart | |
| their timed waits if required.</P> | |
| <P><B>pthread_timechange_handler_np </B>has the same return type and | |
| argument type as a thread routine so that it may be called directly | |
| through pthread_create(), i.e. as a separate thread. If run as a | |
| thread, the return code must be retrieved through <A HREF="pthread_join.html"><B>pthread_join</B>()</A>.</P> | |
| <P>Although the <I>dummy</I> parameter is required it is not used and | |
| any value including NULL can be given.</P> | |
| <H2><A HREF="#toc3" NAME="sect3">Cancellation</A></H2> | |
| <P>None.</P> | |
| <H2><A HREF="#toc4" NAME="sect4"><FONT COLOR="#000080">Return Value</FONT></A></H2> | |
| <P><B>pthread_timechange_handler_np</B> returns 0 on success, or an | |
| error code.</P> | |
| <H2><A HREF="#toc5" NAME="sect5">Errors</A></H2> | |
| <P>The <B>pthread_timechange_handler_np</B> function returns the | |
| following error code on error: | |
| </P> | |
| <DL> | |
| <DL> | |
| <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EAGAIN</B> | |
| </DT></DL> | |
| </DL> | |
| <P STYLE="margin-left: 2cm; margin-bottom: 0cm"> | |
| To indicate that not all condition variables were signalled for some | |
| reason.</P> | |
| <H2><A HREF="#toc6" NAME="sect6">Author</A></H2> | |
| <P>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">Cancellation</A> | |
| </P> | |
| <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Return | |
| Value</A> | |
| </P> | |
| <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Errors</A> | |
| </P> | |
| <LI><P><A HREF="#sect6" NAME="toc6">Author</A> | |
| </P> | |
| </UL> | |
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