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<title>pthread_spin_lock</title>
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<basefont size="3"> <a name="pthread_spin_lock"></a> <a name="tag_03_575"></a><!-- pthread_spin_lock -->
<!--header start-->
<center><font size="2">The Open Group Base Specifications Issue 6<br>
IEEE Std 1003.1-2001<br>
Copyright &copy; 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
<!--header end-->
<hr size="2" noshade>
<h4><a name="tag_03_575_01"></a>NAME</h4>
<blockquote>pthread_spin_lock, pthread_spin_trylock - lock a spin lock object (<b>ADVANCED REALTIME THREADS</b>)</blockquote>
<h4><a name="tag_03_575_02"></a>SYNOPSIS</h4>
<blockquote class="synopsis">
<div class="box"><code><tt><sup>[<a href="javascript:open_code('THR SPI')">THR SPI</a>]</sup> <img src="../images/opt-start.gif" alt=
"[Option Start]" border="0"> #include &lt;<a href="../basedefs/pthread.h.html">pthread.h</a>&gt;<br>
<br>
int pthread_spin_lock(pthread_spinlock_t *</tt><i>lock</i><tt>);<br>
int pthread_spin_trylock(pthread_spinlock_t *</tt><i>lock</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
"0"></tt></code></div>
<tt><br>
</tt></blockquote>
<h4><a name="tag_03_575_03"></a>DESCRIPTION</h4>
<blockquote>
<p>The <i>pthread_spin_lock</i>() function shall lock the spin lock referenced by <i>lock</i>. The calling thread shall acquire the
lock if it is not held by another thread. Otherwise, the thread shall spin (that is, shall not return from the
<i>pthread_spin_lock</i>() call) until the lock becomes available. The results are undefined if the calling thread holds the lock
at the time the call is made. The <i>pthread_spin_trylock</i>() function shall lock the spin lock referenced by <i>lock</i> if it
is not held by any thread. Otherwise, the function shall fail.</p>
<p>The results are undefined if any of these functions is called with an uninitialized spin lock.</p>
</blockquote>
<h4><a name="tag_03_575_04"></a>RETURN VALUE</h4>
<blockquote>
<p>Upon successful completion, these functions shall return zero; otherwise, an error number shall be returned to indicate the
error.</p>
</blockquote>
<h4><a name="tag_03_575_05"></a>ERRORS</h4>
<blockquote>
<p>These functions may fail if:</p>
<dl compact>
<dt>[EINVAL]</dt>
<dd>The value specified by <i>lock</i> does not refer to an initialized spin lock object.</dd>
</dl>
<p>The <i>pthread_spin_lock</i>() function may fail if:</p>
<dl compact>
<dt>[EDEADLK]</dt>
<dd>The calling thread already holds the lock.</dd>
</dl>
<p>The <i>pthread_spin_trylock</i>() function shall fail if:</p>
<dl compact>
<dt>[EBUSY]</dt>
<dd>A thread currently holds the lock.</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_575_06"></a>EXAMPLES</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_575_07"></a>APPLICATION USAGE</h4>
<blockquote>
<p>Applications using this function may be subject to priority inversion, as discussed in the Base Definitions volume of
IEEE&nbsp;Std&nbsp;1003.1-2001, <a href="../basedefs/xbd_chap03.html#tag_03_285">Section 3.285, Priority Inversion</a>.</p>
<p>The <i>pthread_spin_lock</i>() and <i>pthread_spin_trylock</i>() functions are part of the Spin Locks option and need not be
provided on all implementations.</p>
</blockquote>
<h4><a name="tag_03_575_08"></a>RATIONALE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_575_09"></a>FUTURE DIRECTIONS</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_575_10"></a>SEE ALSO</h4>
<blockquote>
<p><a href="pthread_spin_destroy.html"><i>pthread_spin_destroy</i>()</a> , <a href=
"pthread_spin_unlock.html"><i>pthread_spin_unlock</i>()</a> , the Base Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a
href="../basedefs/pthread.h.html"><i>&lt;pthread.h&gt;</i></a></p>
</blockquote>
<h4><a name="tag_03_575_11"></a>CHANGE HISTORY</h4>
<blockquote>
<p>First released in Issue 6. Derived from IEEE&nbsp;Std&nbsp;1003.1j-2000.</p>
<p>In the SYNOPSIS, the inclusion of <a href="../basedefs/sys/types.h.html"><i>&lt;sys/types.h&gt;</i></a> is no longer
required.</p>
</blockquote>
<div class="box"><em>End of informative text.</em></div>
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