153 lines
6.5 KiB
HTML
153 lines
6.5 KiB
HTML
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<title>pthread_attr_getstackaddr</title>
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<basefont size="3"> <a name="pthread_attr_getstackaddr"></a> <a name="tag_03_495"></a><!-- pthread_attr_getstackaddr -->
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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_495_01"></a>NAME</h4>
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<blockquote>pthread_attr_getstackaddr, pthread_attr_setstackaddr - get and set the stackaddr attribute</blockquote>
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<h4><a name="tag_03_495_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 TSA')">THR TSA</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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<img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('OB')">OB</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> int pthread_attr_getstackaddr(const pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br>
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void **restrict</tt> <i>stackaddr</i><tt>);<br>
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int pthread_attr_setstackaddr(pthread_attr_t *</tt><i>attr</i><tt>, void *</tt><i>stackaddr</i><tt>); <img src=
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"../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_495_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_attr_getstackaddr</i>() and <i>pthread_attr_setstackaddr</i>() functions, respectively, shall get and set the
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thread creation <i>stackaddr</i> attribute in the <i>attr</i> object.</p>
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<p>The <i>stackaddr</i> attribute specifies the location of storage to be used for the created thread's stack. The size of the
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storage shall be at least {PTHREAD_STACK_MIN}.</p>
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</blockquote>
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<h4><a name="tag_03_495_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>pthread_attr_getstackaddr</i>() and <i>pthread_attr_setstackaddr</i>() shall return a value of 0;
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otherwise, an error number shall be returned to indicate the error.</p>
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<p>The <i>pthread_attr_getstackaddr</i>() function stores the <i>stackaddr</i> attribute value in <i>stackaddr</i> if
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successful.</p>
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</blockquote>
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<h4><a name="tag_03_495_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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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_495_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_495_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The specification of the <i>stackaddr</i> attribute presents several ambiguities that make portable use of these interfaces
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impossible. The description of the single address parameter as a "stack" does not specify a particular relationship between the
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address and the "stack" implied by that address. For example, the address may be taken as the low memory address of a buffer
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intended for use as a stack, or it may be taken as the address to be used as the initial stack pointer register value for the new
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thread. These two are not the same except for a machine on which the stack grows "up" from low memory to high, and on which a
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"push" operation first stores the value in memory and then increments the stack pointer register. Further, on a machine where the
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stack grows "down" from high memory to low, interpretation of the address as the "low memory" address requires a determination
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of the intended size of the stack. IEEE Std 1003.1-2001 has introduced the new interfaces <a href=
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"../functions/pthread_attr_setstack.html"><i>pthread_attr_setstack</i>()</a> and <a href=
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"../functions/pthread_attr_getstack.html"><i>pthread_attr_getstack</i>()</a> to resolve these ambiguities.</p>
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</blockquote>
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<h4><a name="tag_03_495_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_495_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_495_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_attr_destroy.html"><i>pthread_attr_destroy</i>()</a> , <a href=
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"pthread_attr_getdetachstate.html"><i>pthread_attr_getdetachstate</i>()</a> , <a href=
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"pthread_attr_getstack.html"><i>pthread_attr_getstack</i>()</a> , <a href=
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"pthread_attr_getstacksize.html"><i>pthread_attr_getstacksize</i>()</a> , <a href=
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"pthread_attr_setstack.html"><i>pthread_attr_setstack</i>()</a> , <a href="pthread_create.html"><i>pthread_create</i>()</a> , the
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Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/limits.h.html"><i><limits.h></i></a>, <a
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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_495_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p>
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</blockquote>
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<h4><a name="tag_03_495_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_attr_getstackaddr</i>() and <i>pthread_attr_setstackaddr</i>() functions are marked as part of the Threads and
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Thread Stack Address Attribute options.</p>
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<p>The <b>restrict</b> keyword is added to the <i>pthread_attr_getstackaddr</i>() prototype for alignment with the
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ISO/IEC 9899:1999 standard.</p>
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<p>These functions are marked obsolescent.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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