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<title>Using the GNU Compiler Collection (GCC): C++98 Thread-Local Edits</title>
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<a name="C_002b_002b98-Thread_002dLocal-Edits"></a>
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<p>
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Previous: <a href="C99-Thread_002dLocal-Edits.html#C99-Thread_002dLocal-Edits" accesskey="p" rel="prev">C99 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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<hr>
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<a name="ISO_002fIEC-14882_003a1998-Edits-for-Thread_002dLocal-Storage"></a>
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<h4 class="subsection">6.63.2 ISO/IEC 14882:1998 Edits for Thread-Local Storage</h4>
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<p>The following are a set of changes to ISO/IEC 14882:1998 (aka C++98)
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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> <b>[intro.execution]</b>
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<p>New text after paragraph 4
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</p>
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<blockquote>
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<p>A <em>thread</em> is a flow of control within the abstract machine.
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It is implementation defined whether or not there may be more than
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one thread.
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</p></blockquote>
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<p>New text after paragraph 7
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</p>
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<blockquote>
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<p>It is unspecified whether additional action must be taken to
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ensure when and whether side effects are visible to other threads.
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</p></blockquote>
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</li><li> <b>[lex.key]</b>
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<p>Add <code>__thread</code>.
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</p>
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</li><li> <b>[basic.start.main]</b>
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<p>Add after paragraph 5
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</p>
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<blockquote>
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<p>The thread that begins execution at the <code>main</code> function is called
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the <em>main thread</em>. It is implementation defined how functions
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beginning threads other than the main thread are designated or typed.
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A function so designated, as well as the <code>main</code> function, is called
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a <em>thread startup function</em>. It is implementation defined what
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happens if a thread startup function returns. It is implementation
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defined what happens to other threads when any thread calls <code>exit</code>.
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</p></blockquote>
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</li><li> <b>[basic.start.init]</b>
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<p>Add after paragraph 4
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</p>
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<blockquote>
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<p>The storage for an object of thread storage duration shall be
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statically initialized before the first statement of the thread startup
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function. An object of thread storage duration shall not require
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dynamic initialization.
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</p></blockquote>
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</li><li> <b>[basic.start.term]</b>
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<p>Add after paragraph 3
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</p>
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<blockquote>
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<p>The type of an object with thread storage duration shall not have a
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non-trivial destructor, nor shall it be an array type whose elements
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(directly or indirectly) have non-trivial destructors.
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</p></blockquote>
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</li><li> <b>[basic.stc]</b>
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<p>Add “thread storage duration” to the list in paragraph 1.
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</p>
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<p>Change paragraph 2
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</p>
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<blockquote>
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<p>Thread, static, and automatic storage durations are associated with
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objects introduced by declarations […].
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</p></blockquote>
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<p>Add <code>__thread</code> to the list of specifiers in paragraph 3.
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</p>
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</li><li> <b>[basic.stc.thread]</b>
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<p>New section before <b>[basic.stc.static]</b>
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</p>
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<blockquote>
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<p>The keyword <code>__thread</code> applied to a non-local object gives the
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object thread storage duration.
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</p>
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<p>A local variable or class data member declared both <code>static</code>
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and <code>__thread</code> gives the variable or member thread storage
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duration.
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</p></blockquote>
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</li><li> <b>[basic.stc.static]</b>
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<p>Change paragraph 1
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</p>
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<blockquote>
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<p>All objects that have neither thread storage duration, dynamic
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storage duration nor are local […].
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</p></blockquote>
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</li><li> <b>[dcl.stc]</b>
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<p>Add <code>__thread</code> to the list in paragraph 1.
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</p>
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<p>Change paragraph 1
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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
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<var>storage-class-specifier</var> shall appear in a given
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<var>decl-specifier-seq</var>. The <code>__thread</code> specifier may
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be used alone, or immediately following the <code>extern</code> or
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<code>static</code> specifiers. […]
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</p></blockquote>
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<p>Add after paragraph 5
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</p>
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<blockquote>
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<p>The <code>__thread</code> specifier can be applied only to the names of objects
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and to anonymous unions.
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</p></blockquote>
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</li><li> <b>[class.mem]</b>
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<p>Add after paragraph 6
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</p>
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<blockquote>
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<p>Non-<code>static</code> members shall not be <code>__thread</code>.
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</p></blockquote>
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</li></ul>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="C99-Thread_002dLocal-Edits.html#C99-Thread_002dLocal-Edits" accesskey="p" rel="prev">C99 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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