📄 c--98-thread-local-edits.html
字号:
<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller }--></style></head><body><div class="node"><p>Node: <a name="C++98%20Thread-Local%20Edits">C++98 Thread-Local Edits</a>,Previous: <a rel="previous" accesskey="p" href="C99-Thread-Local-Edits.html#C99%20Thread-Local%20Edits">C99 Thread-Local Edits</a>,Up: <a rel="up" accesskey="u" href="Thread-Local.html#Thread-Local">Thread-Local</a><hr><br></div><h3 class="subsection">ISO/IEC 14882:1998 Edits for Thread-Local Storage</h4><p>The following are a set of changes to ISO/IEC 14882:1998 (aka C++98)that document the exact semantics of the language extension. <ul><li><b>[intro.execution]</b> <p>New text after paragraph 4 <blockquote>A <dfn>thread</dfn> is a flow of control within the abstract machine. It is implementation defined whether or not there may be more thanone thread. </blockquote> <p>New text after paragraph 7 <blockquote>It is unspecified whether additional action must be taken toensure when and whether side effects are visible to other threads. </blockquote> </p><li><b>[lex.key]</b> <p>Add <code>__thread</code>. </p><li><b>[basic.start.main]</b> <p>Add after paragraph 5 <blockquote>The thread that begins execution at the <code>main</code> function is calledthe <dfn>main thread</dfn>. It is implementation defined how functionsbeginning threads other than the main thread are designated or typed. A function so designated, as well as the <code>main</code> function, is calleda <dfn>thread startup function</dfn>. It is implementation defined whathappens if a thread startup function returns. It is implementationdefined what happens to other threads when any thread calls <code>exit</code>. </blockquote> </p><li><b>[basic.start.init]</b> <p>Add after paragraph 4 <blockquote>The storage for an object of thread storage duration shall bestatically initialized before the first statement of the thread startupfunction. An object of thread storage duration shall not requiredynamic initialization. </blockquote> </p><li><b>[basic.start.term]</b> <p>Add after paragraph 3 <blockquote>The type of an object with thread storage duration shall not have anon-trivial destructor, nor shall it be an array type whose elements(directly or indirectly) have non-trivial destructors. </blockquote> </p><li><b>[basic.stc]</b> <p>Add "thread storage duration" to the list in paragraph 1. <p>Change paragraph 2 <blockquote>Thread, static, and automatic storage durations are associated withobjects introduced by declarations [<small class="dots">...</small>]. </blockquote> <p>Add <code>__thread</code> to the list of specifiers in paragraph 3. </p><li><b>[basic.stc.thread]</b> <p>New section before <b>[basic.stc.static]</b> <blockquote>The keyword <code>__thread</code> applied to a non-local object gives theobject thread storage duration. <p>A local variable or class data member declared both <code>static</code>and <code>__thread</code> gives the variable or member thread storageduration. </blockquote> </p><li><b>[basic.stc.static]</b> <p>Change paragraph 1 <blockquote>All objects which have neither thread storage duration, dynamicstorage duration nor are local [<small class="dots">...</small>]. </blockquote> </p><li><b>[dcl.stc]</b> <p>Add <code>__thread</code> to the list in paragraph 1. <p>Change paragraph 1 <blockquote>With the exception of <code>__thread</code>, at most one<var>storage-class-specifier</var> shall appear in a given<var>decl-specifier-seq</var>. The <code>__thread</code> specifier maybe used alone, or immediately following the <code>extern</code> or<code>static</code> specifiers. [<small class="dots">...</small>]</blockquote> <p>Add after paragraph 5 <blockquote>The <code>__thread</code> specifier can be applied only to the names of objectsand to anonymous unions. </blockquote> </p><li><b>[class.mem]</b> <p>Add after paragraph 6 <blockquote>Non-<code>static</code> members shall not be <code>__thread</code>. </blockquote> </ul> </body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -