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144 lines
5.6 KiB
HTML
144 lines
5.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 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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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>C99 Thread-Local Edits (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="C99 Thread-Local Edits (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="C99 Thread-Local Edits (Using the GNU Compiler Collection (GCC))">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Thread_002dLocal.html#Thread_002dLocal" rel="up" title="Thread-Local">
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<link href="C_002b_002b98-Thread_002dLocal-Edits.html#C_002b_002b98-Thread_002dLocal-Edits" rel="next" title="C++98 Thread-Local Edits">
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<link href="Thread_002dLocal.html#Thread_002dLocal" rel="prev" title="Thread-Local">
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<style type="text/css">
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</head>
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<body lang="en">
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<a name="C99-Thread_002dLocal-Edits"></a>
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<div class="header">
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<p>
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Next: <a href="C_002b_002b98-Thread_002dLocal-Edits.html#C_002b_002b98-Thread_002dLocal-Edits" accesskey="n" rel="next">C++98 Thread-Local Edits</a>, Up: <a href="Thread_002dLocal.html#Thread_002dLocal" accesskey="u" rel="up">Thread-Local</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="ISO_002fIEC-9899_003a1999-Edits-for-Thread_002dLocal-Storage"></a>
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<h4 class="subsection">6.63.1 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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</p>
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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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</p>
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<blockquote>
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<p>Within either execution environment, a <em>thread</em> 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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</p></blockquote>
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</li><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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</p>
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<blockquote>
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<p>An object whose identifier is declared with the storage-class
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specifier <code><span class="nolinebreak">__thread</span></code><!-- /@w --> has <em>thread storage duration</em>.
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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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</p></blockquote>
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</li><li> <cite>6.4.1 Keywords</cite>
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<p>Add <code>__thread</code>.
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</p>
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</li><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>
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<p>Change paragraph 2 to
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</p>
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<blockquote>
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<p>With the exception of <code>__thread</code>, at most one storage-class
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specifier may be given […]. 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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</p></blockquote>
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<p>Add new text after paragraph 6
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</p>
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<blockquote>
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<p>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>
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<p>The <code>__thread</code> specifier shall be used only with
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variables.
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</p></blockquote>
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</li></ul>
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</body>
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</html>
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