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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >Clocks and Timers [POSIX Section 14]</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="POSIX Standard Support" HREF="posix-standard-support.html"><LINK REL="PREVIOUS" TITLE="Execution Scheduling [POSIX Section 13]" HREF="posix-execution-scheduling.html"><LINK REL="NEXT" TITLE="Message Passing [POSIX Section 15]" HREF="posix-message-passing.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="posix-execution-scheduling.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 31. POSIX Standard Support</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="posix-message-passing.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="POSIX-CLOCKS-AND-TIMERS">Clocks and Timers [POSIX Section 14]</H1 ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13230">Functions Implemented</H2 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >int clock_settime( clockid_t clock_id, const struct timespec *tp); int clock_gettime( clockid_t clock_id, struct timespec *tp); int clock_getres( clockid_t clock_id, struct timespec *tp); int timer_create( clockid_t clock_id, struct sigevent *evp, timer_t *timer_id); int timer_delete( timer_t timer_id ); int timer_settime( timer_t timerid, int flags, const struct itimerspec *value, struct itimerspec *ovalue ); int timer_gettime( timer_t timerid, struct itimerspec *value ); int timer_getoverrun( timer_t timerid ); int nanosleep( const struct timespec *rqtp, struct timespec *rmtp);</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13233">Functions Omitted</H2 ><P ><none></P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13236">Notes</H2 ><P ></P ><UL ><LI ><P > Currently <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >timer_getoverrun()</I ></SPAN > only reports timer notifications that are delayed in the timer subsystem. If they are delayed in the signal subsystem, due to signal masks for example, this is not counted as an overrun. </P ></LI ><LI ><P > The option CYGPKG_POSIX_TIMERS allows the timer support to be enabled or disabled, and causes _POSIX_TIMERS to be defined appropriately. This will cause other parts of the POSIX system to have limited functionality. </P ></LI ></UL ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="posix-execution-scheduling.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="posix-message-passing.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Execution Scheduling [POSIX Section 13]</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="posix-standard-support.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Message Passing [POSIX Section 15]</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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