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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 >Thread-Specific Data [POSIX Section 17]</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="Thread Management [POSIX Section 16]" HREF="posix-thread-management.html"><LINK REL="NEXT" TITLE="Thread Cancellation [POSIX Section 18]" HREF="posix-thread-cancellation.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-thread-management.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-thread-cancellation.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="POSIX-THREAD-SPECIFIC-DATA">Thread-Specific Data [POSIX Section 17]</H1 ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13287">Functions Implemented</H2 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >int pthread_key_create(pthread_key_t *key, void (*destructor)(void *)); int pthread_setspecific(pthread_key_t key, const void *pointer); void *pthread_getspecific(pthread_key_t key); int pthread_key_delete(pthread_key_t key);</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13290">Functions Omitted</H2 ><P ><none></P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13293">Notes</H2 ><P ></P ><UL ><LI ><P > The value of PTHREAD_DESTRUCTOR_ITERATIONS is provided by the CYGNUM_POSIX_PTHREAD_DESTRUCTOR_ITERATIONS option. This controls the number of times that a key destructor will be called while the data item remains non-NULL. </P ></LI ><LI ><P > The value of PTHREAD_KEYS_MAX is provided by the CYGNUM_POSIX_PTHREAD_KEYS_MAX option. This defines the maximum number of per-thread data items supported. The POSIX standard calls for this to be a minimum of 128, which is rather large for an embedded system. The default value for this option is set to 128 for compatibility but it should be reduced to a more usable value. </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-thread-management.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-thread-cancellation.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Thread Management [POSIX Section 16]</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" >Thread Cancellation [POSIX Section 18]</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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