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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 Management [POSIX Section 16]</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="Message Passing [POSIX Section 15]"HREF="posix-message-passing.html"><LINKREL="NEXT"TITLE="Thread-Specific Data [POSIX Section 17]"HREF="posix-thread-specific-data.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-message-passing.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-specific-data.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="POSIX-THREAD-MANAGEMENT">Thread Management [POSIX Section 16]</H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13263">Functions Implemented</H2><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">int pthread_attr_init(pthread_attr_t *attr); int pthread_attr_destroy(pthread_attr_t *attr); int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate); int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate); int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr); int pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr); int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize); int pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize); int pthread_create( pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);pthread_t pthread_self( void ); int pthread_equal(pthread_t thread1, pthread_t thread2); void pthread_exit(void *retval); int pthread_join(pthread_t thread, void **thread_return); int pthread_detach(pthread_t thread); int pthread_once(pthread_once_t *once_control, void (*init_routine)(void));</PRE></TD></TR></TABLE></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13266">Functions Omitted</H2><P><none></P></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13269">Notes</H2><P></P><UL><LI><P> The presence of thread support as a whole is controlled by the the CYGPKG_POSIX_PTHREAD configuration option. Note that disabling this will also disable many other features of the POSIX package, since these are intimately bound up with the thread mechanism. </P></LI><LI><P> The default (non-scheduling) thread attributes are: </P><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN"> detachstate PTHREAD_CREATE_JOINABLE stackaddr unset stacksize unset </PRE></TD></TR></TABLE></LI><LI><P> Dynamic thread stack allocation is only provided if there is an implementation of <SPANCLASS="emphasis"><ICLASS="EMPHASIS">malloc()</I></SPAN> configured (i.e. a package implements the CYGINT_MEMALLOC_MALLOC_ALLOCATORS interface). If there is no malloc() available, then the thread creator must supply a stack. If only a stack address is supplied then the stack is assumed to be PTHREAD_STACK_MIN bytes long. This size is seldom useful for any but the most trivial of threads. If a different sized stack is used, both the stack address and stack size must be supplied. </P></LI><LI><P> The value of PTHREAD_THREADS_MAX is supplied by the CYGNUM_POSIX_PTHREAD_THREADS_MAX option. This defines the maximum number of threads allowed. The POSIX standard requires this value to be at least 64, and this is the default value set. </P></LI><LI><P> When the POSIX package is installed, the thread that calls <SPANCLASS="emphasis"><ICLASS="EMPHASIS">main()</I></SPAN> is initialized as a POSIX thread. The priority of that thread is controlled by the CYGNUM_POSIX_MAIN_DEFAULT_PRIORITY option. </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-message-passing.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-specific-data.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Message Passing [POSIX Section 15]</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="posix-standard-support.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Thread-Specific Data [POSIX Section 17]</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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