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<a name="putc_005funlocked"></a>
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<p>
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Next: <a href="putchar.html#putchar" accesskey="n" rel="next">putchar</a>, Previous: <a href="putc.html#putc" accesskey="p" rel="prev">putc</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="putc_005funlocked_002d_002d_002dnon_002dthread_002dsafe-version-of-putc-_0028macro_0029"></a>
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<h3 class="section">4.46 <code>putc_unlocked</code>—non-thread-safe version of putc (macro)</h3>
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<a name="index-putc_005funlocked"></a>
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<a name="index-_005fputc_005funlocked_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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int putc_unlocked(int <var>ch</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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int _putc_unlocked_r(struct _reent *<var>ptr</var>, int <var>ch</var>, FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>putc_unlocked</code> is a non-thread-safe version of <code>putc</code> declared in
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<code>stdio.h</code>. <code>putc_unlocked</code> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). These
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functions may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the ( FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions. If threads are disabled, then
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<code>putc_unlocked</code> is equivalent to <code>putc</code>.
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</p>
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<p>The function <code>_putc_unlocked_r</code> is simply the reentrant version of
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<code>putc_unlocked</code> that takes an additional reentrant structure pointer
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argument: <var>ptr</var>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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See <code>putc</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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POSIX 1003.1 requires <code>putc_unlocked</code>. <code>putc_unlocked</code> may be
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implemented as a macro, so arguments should not have side-effects.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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