📄 c99-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="C99%20Thread-Local%20Edits">C99 Thread-Local Edits</a>,Next: <a rel="next" accesskey="n" href="C--98-Thread-Local-Edits.html#C++98%20Thread-Local%20Edits">C++98 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 9899:1999 Edits for Thread-Local Storage</h4><p>The following are a set of changes to ISO/IEC 9899:1999 (aka C99)that document the exact semantics of the language extension. <ul><li><cite>5.1.2 Execution environments</cite> <p>Add new text after paragraph 1 <blockquote>Within either execution environment, a <dfn>thread</dfn> is a flow ofcontrol within a program. It is implementation defined whetheror not there may be more than one thread associated with a program. It is implementation defined how threads beyond the first arecreated, the name and type of the function called at threadstartup, and how threads may be terminated. However, objectswith thread storage duration shall be initialized before threadstartup. </blockquote> </p><li><cite>6.2.4 Storage durations of objects</cite> <p>Add new text before paragraph 3 <blockquote>An object whose identifier is declared with the storage-classspecifier <code>__thread</code> has <dfn>thread storage duration</dfn>. Its lifetime is the entire execution of the thread, and itsstored value is initialized only once, prior to thread startup. </blockquote> </p><li><cite>6.4.1 Keywords</cite> <p>Add <code>__thread</code>. </p><li><cite>6.7.1 Storage-class specifiers</cite> <p>Add <code>__thread</code> to the list of storage class specifiers inparagraph 1. <p>Change paragraph 2 to <blockquote>With the exception of <code>__thread</code>, at most one storage-classspecifier may be given [<small class="dots">...</small>]. The <code>__thread</code> specifier maybe used alone, or immediately following <code>extern</code> or<code>static</code>. </blockquote> <p>Add new text after paragraph 6 <blockquote>The declaration of an identifier for a variable that hasblock scope that specifies <code>__thread</code> shall alsospecify either <code>extern</code> or <code>static</code>. <p>The <code>__thread</code> specifier shall be used only withvariables. </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 + -