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102 lines
4.3 KiB
HTML
102 lines
4.3 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>getchar_unlocked (The Red Hat newlib C Library)</title>
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<body lang="en">
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<a name="getchar_005funlocked"></a>
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<div class="header">
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<p>
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Next: <a href="getdelim.html#getdelim" accesskey="n" rel="next">getdelim</a>, Previous: <a href="getchar.html#getchar" accesskey="p" rel="prev">getchar</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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</div>
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<hr>
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<a name="getchar_005funlocked_002d_002d_002dnon_002dthread_002dsafe-version-of-getchar-_0028macro_0029"></a>
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<h3 class="section">4.36 <code>getchar_unlocked</code>—non-thread-safe version of getchar (macro)</h3>
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<a name="index-getchar_005funlocked"></a>
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<a name="index-_005fgetchar_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 getchar_unlocked(void);
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#include <stdio.h>
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int _getchar_unlocked_r(struct _reent *<var>ptr</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>getchar_unlocked</code> is a non-thread-safe version of <code>getchar</code>
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declared in <code>stdio.h</code>. <code>getchar_unlocked</code> may only safely be used
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within a scope protected by flockfile() (or ftrylockfile()) and
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funlockfile(). These functions may safely be used in a multi-threaded
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program if and only if they are called while the invoking thread owns
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the ( FILE *) object, as is the case after a successful call to the
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flockfile() or ftrylockfile() functions. If threads are disabled,
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then <code>getchar_unlocked</code> is equivalent to <code>getchar</code>.
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</p>
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<p>The <code>_getchar_unlocked_r</code> function is simply the reentrant version of
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<code>getchar_unlocked</code> which passes an addtional reentrancy 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>getchar</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>getchar_unlocked</code>. <code>getchar_unlocked</code> may
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be implemented as a macro.
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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><br>
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</body>
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</html>
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