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<a name="getchar_005funlocked_002d_002d_002dnon_002dthread_002dsafe-version-of-getchar-_0028macro_0029"></a>
<h3 class="section">4.36 <code>getchar_unlocked</code>&mdash;non-thread-safe version of getchar (macro)</h3>
<a name="index-getchar_005funlocked"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
int getchar_unlocked(void);

#include &lt;stdio.h&gt;
int _getchar_unlocked_r(struct _reent *<var>ptr</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>getchar_unlocked</code> is a non-thread-safe version of <code>getchar</code>
declared in <code>stdio.h</code>.  <code>getchar_unlocked</code> may only safely be used
within a scope protected by flockfile() (or ftrylockfile()) and
funlockfile().  These functions may safely be used in a multi-threaded
program if and only if they are called while the invoking thread owns
the ( FILE *) object, as is the case after a successful call to the
flockfile() or ftrylockfile() functions.  If threads are disabled,
then <code>getchar_unlocked</code> is equivalent to <code>getchar</code>.
</p>
<p>The <code>_getchar_unlocked_r</code> function is simply the reentrant version of
<code>getchar_unlocked</code> which passes an addtional reentrancy structure pointer
argument: <var>ptr</var>.
</p>
<br>
<p><strong>Returns</strong><br>
See <code>getchar</code>.
</p>
<br>
<p><strong>Portability</strong><br>
POSIX 1003.1 requires <code>getchar_unlocked</code>.  <code>getchar_unlocked</code> may
be implemented as a macro.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.  
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