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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>pthread_attr_getstack</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="pthread_attr_getstack"></a> <a name="tag_03_494"></a><!-- pthread_attr_getstack --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_494_01"></a>NAME</h4><blockquote>pthread_attr_getstack, pthread_attr_setstack - get and set stack attributes</blockquote><h4><a name="tag_03_494_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('THR')">THR</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br><br><tt><sup>[<a href="javascript:open_code('TSA TSS')">TSA TSS</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> int pthread_attr_getstack(const pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br> void **restrict</tt> <i>stackaddr</i><tt>, size_t *restrict</tt> <i>stacksize</i><tt>);<br> int pthread_attr_setstack(pthread_attr_t *</tt><i>attr</i><tt>, void *</tt><i>stackaddr</i><tt>,<br> size_t</tt> <i>stacksize</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"border="0"></tt><br> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_494_03"></a>DESCRIPTION</h4><blockquote><p>The <i>pthread_attr_getstack</i>() and <i>pthread_attr_setstack</i>() functions, respectively, shall get and set the threadcreation stack attributes <i>stackaddr</i> and <i>stacksize</i> in the <i>attr</i> object.</p><p>The stack attributes specify the area of storage to be used for the created thread's stack. The base (lowest addressable byte)of the storage shall be <i>stackaddr</i>, and the size of the storage shall be <i>stacksize</i> bytes. The <i>stacksize</i> shallbe at least {PTHREAD_STACK_MIN}. The <i>stackaddr</i> shall be aligned appropriately to be used as a stack; for example,<i>pthread_attr_setstack</i>() may fail with [EINVAL] if ( <i>stackaddr</i> & 0x7) is not 0. All pages within the stackdescribed by <i>stackaddr</i> and <i>stacksize</i> shall be both readable and writable by the thread.</p></blockquote><h4><a name="tag_03_494_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, these functions shall return a value of 0; otherwise, an error number shall be returned to indicatethe error.</p><p>The <i>pthread_attr_getstack</i>() function shall store the stack attribute values in <i>stackaddr</i> and <i>stacksize</i> ifsuccessful.</p></blockquote><h4><a name="tag_03_494_05"></a>ERRORS</h4><blockquote><p>The <i>pthread_attr_setstack</i>() function shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value of <i>stacksize</i> is less than {PTHREAD_STACK_MIN} or exceeds an implementation-defined limit.</dd></dl><p>The <i>pthread_attr_getstack</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value specified by <i>addr</i> does not refer to an initialized thread attribute object.</dd></dl><p>The <i>pthread_attr_setstack</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value of <i>stackaddr</i> does not have proper alignment to be used as a stack, or ( <i>stackaddr</i> + <i>stacksize</i>)lacks proper alignment, or the value specified by <i>attr</i> does not refer to an initialized thread attribute object.</dd><dt>[EACCES]</dt><dd>The stack page(s) described by <i>stackaddr</i> and <i>stacksize</i> are not both readable and writable by the thread.</dd></dl><p>These functions shall not return an error code of [EINTR].</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_494_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_494_07"></a>APPLICATION USAGE</h4><blockquote><p>These functions are appropriate for use by applications in an environment where the stack for a thread must be placed in someparticular region of memory.</p><p>While it might seem that an application could detect stack overflow by providing a protected page outside the specified stackregion, this cannot be done portably. Implementations are free to place the thread's initial stack pointer anywhere within thespecified region to accommodate the machine's stack pointer behavior and allocation requirements. Furthermore, on somearchitectures, such as the IA-64, "overflow" might mean that two separate stack pointers allocated within the region will overlapsomewhere in the middle of the region.</p><p>After a successful call to <i>pthread_attr_setstack</i>(), the storage area specified by the <i>stackaddr</i> parameter is underthe control of the implementation, as described in <a href="xsh_chap02_09.html#tag_02_09_08"><i>Use of Application-Managed ThreadStacks</i></a>.</p></blockquote><h4><a name="tag_03_494_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_494_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_494_10"></a>SEE ALSO</h4><blockquote><p><a href="pthread_attr_init.html"><i>pthread_attr_init</i>()</a>, <a href="pthread_attr_setdetachstate.html"><i>pthread_attr_setdetachstate</i>()</a>, <a href="pthread_attr_setstacksize.html"><i>pthread_attr_setstacksize</i>()</a>, <a href="pthread_create.html"><i>pthread_create</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/limits.h.html"><i><limits.h></i></a>,<a href="../basedefs/pthread.h.html"><i><pthread.h></i></a></p></blockquote><h4><a name="tag_03_494_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Developed as an XSI extension and brought into the BASE by IEEE PASC Interpretation 1003.1 #101.</p><p>IEEE Std 1003.1-2001/Cor 2-2004, item XSH/TC2/D6/83 is applied, updating the APPLICATION USAGE section to referto <a href="xsh_chap02_09.html#tag_02_09_08"><i>Use of Application-Managed Thread Stacks</i></a>.</p><p>IEEE Std 1003.1-2001/Cor 2-2004, item XSH/TC/D6/84 is applied, updating the ERRORS section to include optionalerrors for the case when <i>attr</i> refers to an uninitialized thread attribute object.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>?? 快捷鍵說明
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