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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"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos Reference Manual"HREF="ecos-ref.html"><LINKREL="UP"TITLE="POSIX Standard Support"HREF="posix-standard-support.html"><LINKREL="PREVIOUS"TITLE="Thread Management [POSIX Section 16]"HREF="posix-thread-management.html"><LINKREL="NEXT"TITLE="Thread Cancellation [POSIX Section 18]"HREF="posix-thread-cancellation.html"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos Reference Manual</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="posix-thread-management.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 31. POSIX Standard Support</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="posix-thread-cancellation.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="POSIX-THREAD-SPECIFIC-DATA">Thread-Specific Data [POSIX Section 17]</H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13287">Functions Implemented</H2><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="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><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13290">Functions Omitted</H2><P><none></P></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="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><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="posix-thread-management.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-ref.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="posix-thread-cancellation.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Thread Management [POSIX Section 16]</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="posix-standard-support.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Thread Cancellation [POSIX Section 18]</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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