162 lines
6.5 KiB
HTML
162 lines
6.5 KiB
HTML
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<title>pthread_attr_getstack</title>
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<basefont size="3"> <a name="pthread_attr_getstack"></a> <a name="tag_03_494"></a><!-- pthread_attr_getstack -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_494_01"></a>NAME</h4>
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<blockquote>pthread_attr_getstack, pthread_attr_setstack - get and set stack attributes</blockquote>
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<h4><a name="tag_03_494_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('THR')">THR</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br>
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<br>
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<tt><sup>[<a href="javascript:open_code('TSA TSS')">TSA TSS</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> int pthread_attr_getstack(const pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br>
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void **restrict</tt> <i>stackaddr</i><tt>, size_t *restrict</tt> <i>stacksize</i><tt>);<br>
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int pthread_attr_setstack(pthread_attr_t *</tt><i>attr</i><tt>, void *</tt><i>stackaddr</i><tt>,<br>
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size_t</tt> <i>stacksize</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></tt>
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<br>
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<img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt>
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</code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_494_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_attr_getstack</i>() and <i>pthread_attr_setstack</i>() functions, respectively, shall get and set the thread
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creation stack attributes <i>stackaddr</i> and <i>stacksize</i> in the <i>attr</i> object.</p>
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<p>The stack attributes specify the area of storage to be used for the created thread's stack. The base (lowest addressable byte)
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of the storage shall be <i>stackaddr</i>, and the size of the storage shall be <i>stacksize</i> bytes. The <i>stacksize</i> shall
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be at least {PTHREAD_STACK_MIN}. The <i>stackaddr</i> shall be aligned appropriately to be used as a stack; for example,
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<i>pthread_attr_setstack</i>() may fail with [EINVAL] if ( <i>stackaddr</i> & 0x7) is not 0. All pages within the stack
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described by <i>stackaddr</i> and <i>stacksize</i> shall be both readable and writable by the thread.</p>
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</blockquote>
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<h4><a name="tag_03_494_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, these functions shall return a value of 0; otherwise, an error number shall be returned to indicate
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the error.</p>
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<p>The <i>pthread_attr_getstack</i>() function shall store the stack attribute values in <i>stackaddr</i> and <i>stacksize</i> if
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successful.</p>
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</blockquote>
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<h4><a name="tag_03_494_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_attr_setstack</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value of <i>stacksize</i> is less than {PTHREAD_STACK_MIN} or exceeds an implementation-defined limit.</dd>
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</dl>
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<p>The <i>pthread_attr_setstack</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value of <i>stackaddr</i> does not have proper alignment to be used as a stack, or if ( <i>stackaddr</i> +
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<i>stacksize</i>) lacks proper alignment.</dd>
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<dt>[EACCES]</dt>
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<dd>The stack page(s) described by <i>stackaddr</i> and <i>stacksize</i> are not both readable and writable by the thread.</dd>
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</dl>
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<p>These functions shall not return an error code of [EINTR].</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_494_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_494_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>These functions are appropriate for use by applications in an environment where the stack for a thread must be placed in some
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particular region of memory.</p>
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<p>While it might seem that an application could detect stack overflow by providing a protected page outside the specified stack
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region, this cannot be done portably. Implementations are free to place the thread's initial stack pointer anywhere within the
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specified region to accommodate the machine's stack pointer behavior and allocation requirements. Furthermore, on some
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architectures, such as the IA-64, "overflow" might mean that two separate stack pointers allocated within the region will overlap
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somewhere in the middle of the region.</p>
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</blockquote>
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<h4><a name="tag_03_494_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_494_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_494_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_attr_init.html"><i>pthread_attr_init</i>()</a> , <a href=
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"pthread_attr_setdetachstate.html"><i>pthread_attr_setdetachstate</i>()</a> , <a href=
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"pthread_attr_setstacksize.html"><i>pthread_attr_setstacksize</i>()</a> , <a href="pthread_create.html"><i>pthread_create</i>()</a>
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, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/limits.h.html"><i><limits.h></i></a>,
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<a href="../basedefs/pthread.h.html"><i><pthread.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_494_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 6. Developed as an XSI extension and brought into the BASE by IEEE PASC Interpretation 1003.1 #101.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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