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    CWG Issue 786</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
<HR>
<A NAME="786"></A><H4>786.
  
Definition of &#8220;thread&#8221;
</H4>
<B>Section: </B>6.10.2&#160; [<A href="https://wg21.link/intro.multithread">intro.multithread</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD2
 &#160;&#160;&#160;

 <B>Submitter: </B>US
 &#160;&#160;&#160;

 <B>Date: </B>3 March, 2009<BR><BR>


<A href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3086.html#US17">N2800 comment
  US&#160;17<BR></A>

<P>[Voted into WP at October, 2009 meeting.]</P>

<P>The term &#8220;thread&#8221; is introduced but not defined in
6.10.2 [<A href="https://wg21.link/intro.multithread#1">intro.multithread</A>] paragraph 1.  A definition is needed.</P>

<P><B>Proposed resolution (September, 2009):</B></P>

<P>Chamge 6.10.2 [<A href="https://wg21.link/intro.multithread#1">intro.multithread</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

<INS>A <I>thread of execution</I> (a.k.a. <I>thread</I>) is a single
flow of control within a program, including the initial invocation of
a specific top-level function, and recursively including every
function invocation subsequently executed by the thread. [<I>Note:</I>
When one thread creates another, the initial call to the top-level
function of the new thread is executed by the new thread, not by the
creating thread. &#8212;<I>end note</I>] Every thread in a program can
potentially access every object and function in the program.
[<I>Footnote:</I> An object with automatic or thread storage duration
(6.8.6 [<A href="https://wg21.link/basic.stc">basic.stc</A>]) is associated with one specific thread, and
can be accessed by a different thread only indirectly through a
pointer or reference (6.9.4 [<A href="https://wg21.link/basic.compound">basic.compound</A>]).  &#8212;<I>end
footnote</I>]</INS> Under a hosted implementation, a C++ program can
have more than one <DEL><I>thread of execution</I>
(a.k.a. <I>thread</I>)</DEL> <INS>thread</INS> running concurrently...

</BLOCKQUOTE>

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