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118 lines
4.4 KiB
HTML
118 lines
4.4 KiB
HTML
4 years ago
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<title>C99 Thread-Local Edits - Using the GNU Compiler Collection (GCC)</title>
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<link rel="up" href="Thread_002dLocal.html#Thread_002dLocal" title="Thread-Local">
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<link rel="next" href="C_002b_002b98-Thread_002dLocal-Edits.html#C_002b_002b98-Thread_002dLocal-Edits" title="C++98 Thread-Local Edits">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<body>
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<div class="node">
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<a name="C99-Thread-Local-Edits"></a>
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<a name="C99-Thread_002dLocal-Edits"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="C_002b_002b98-Thread_002dLocal-Edits.html#C_002b_002b98-Thread_002dLocal-Edits">C++98 Thread-Local Edits</a>,
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Up: <a rel="up" accesskey="u" href="Thread_002dLocal.html#Thread_002dLocal">Thread-Local</a>
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<hr>
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</div>
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<h4 class="subsection">6.62.1 ISO/IEC 9899:1999 Edits for Thread-Local Storage</h4>
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<p>The following are a set of changes to ISO/IEC 9899:1999 (aka C99)
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that document the exact semantics of the language extension.
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<ul>
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<li><cite>5.1.2 Execution environments</cite>
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<p>Add new text after paragraph 1
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<blockquote>
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Within either execution environment, a <dfn>thread</dfn> is a flow of
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control within a program. It is implementation defined whether
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or not there may be more than one thread associated with a program.
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It is implementation defined how threads beyond the first are
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created, the name and type of the function called at thread
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startup, and how threads may be terminated. However, objects
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with thread storage duration shall be initialized before thread
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startup.
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</blockquote>
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<li><cite>6.2.4 Storage durations of objects</cite>
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<p>Add new text before paragraph 3
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<blockquote>
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An object whose identifier is declared with the storage-class
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specifier <code>__thread</code><!-- /@w --> has <dfn>thread storage duration</dfn>.
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Its lifetime is the entire execution of the thread, and its
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stored value is initialized only once, prior to thread startup.
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</blockquote>
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<li><cite>6.4.1 Keywords</cite>
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<p>Add <code>__thread</code>.
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<li><cite>6.7.1 Storage-class specifiers</cite>
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<p>Add <code>__thread</code> to the list of storage class specifiers in
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paragraph 1.
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<p>Change paragraph 2 to
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<blockquote>
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With the exception of <code>__thread</code>, at most one storage-class
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specifier may be given [<small class="dots">...</small>]. The <code>__thread</code> specifier may
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be used alone, or immediately following <code>extern</code> or
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<code>static</code>.
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</blockquote>
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<p>Add new text after paragraph 6
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<blockquote>
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The declaration of an identifier for a variable that has
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block scope that specifies <code>__thread</code> shall also
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specify either <code>extern</code> or <code>static</code>.
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<p>The <code>__thread</code> specifier shall be used only with
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variables.
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</blockquote>
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</ul>
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</body></html>
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