You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
6.2 KiB
HTML
120 lines
6.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Free Software" and "Free Software Needs
|
|
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
|
|
and with the Back-Cover Texts as in (a) below.
|
|
|
|
(a) The FSF's Back-Cover Text is: "You are free to copy and modify
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
|
developing GNU and promoting software freedom." -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Thread groups (Debugging with GDB)</title>
|
|
|
|
<meta name="description" content="Thread groups (Debugging with GDB)">
|
|
<meta name="keywords" content="Thread groups (Debugging with GDB)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="GDB_002fMI-General-Design.html#GDB_002fMI-General-Design" rel="up" title="GDB/MI General Design">
|
|
<link href="GDB_002fMI-Command-Syntax.html#GDB_002fMI-Command-Syntax" rel="next" title="GDB/MI Command Syntax">
|
|
<link href="Asynchronous-and-non_002dstop-modes.html#Asynchronous-and-non_002dstop-modes" rel="prev" title="Asynchronous and non-stop modes">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Thread-groups"></a>
|
|
<div class="header">
|
|
<p>
|
|
Previous: <a href="Asynchronous-and-non_002dstop-modes.html#Asynchronous-and-non_002dstop-modes" accesskey="p" rel="prev">Asynchronous and non-stop modes</a>, Up: <a href="GDB_002fMI-General-Design.html#GDB_002fMI-General-Design" accesskey="u" rel="up">GDB/MI General Design</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="Thread-groups-1"></a>
|
|
<h4 class="subsection">27.1.3 Thread groups</h4>
|
|
<p><small>GDB</small> may be used to debug several processes at the same time.
|
|
On some platfroms, <small>GDB</small> may support debugging of several
|
|
hardware systems, each one having several cores with several different
|
|
processes running on each core. This section describes the MI
|
|
mechanism to support such debugging scenarios.
|
|
</p>
|
|
<p>The key observation is that regardless of the structure of the
|
|
target, MI can have a global list of threads, because most commands that
|
|
accept the ‘<samp>--thread</samp>’ option do not need to know what process that
|
|
thread belongs to. Therefore, it is not necessary to introduce
|
|
neither additional ‘<samp>--process</samp>’ option, nor an notion of the
|
|
current process in the MI interface. The only strictly new feature
|
|
that is required is the ability to find how the threads are grouped
|
|
into processes.
|
|
</p>
|
|
<p>To allow the user to discover such grouping, and to support arbitrary
|
|
hierarchy of machines/cores/processes, MI introduces the concept of a
|
|
<em>thread group</em>. Thread group is a collection of threads and other
|
|
thread groups. A thread group always has a string identifier, a type,
|
|
and may have additional attributes specific to the type. A new
|
|
command, <code>-list-thread-groups</code>, returns the list of top-level
|
|
thread groups, which correspond to processes that <small>GDB</small> is
|
|
debugging at the moment. By passing an identifier of a thread group
|
|
to the <code>-list-thread-groups</code> command, it is possible to obtain
|
|
the members of specific thread group.
|
|
</p>
|
|
<p>To allow the user to easily discover processes, and other objects, he
|
|
wishes to debug, a concept of <em>available thread group</em> is
|
|
introduced. Available thread group is an thread group that
|
|
<small>GDB</small> is not debugging, but that can be attached to, using the
|
|
<code>-target-attach</code> command. The list of available top-level thread
|
|
groups can be obtained using ‘<samp>-list-thread-groups --available</samp>’.
|
|
In general, the content of a thread group may be only retrieved only
|
|
after attaching to that thread group.
|
|
</p>
|
|
<p>Thread groups are related to inferiors (see <a href="Inferiors-and-Programs.html#Inferiors-and-Programs">Inferiors and Programs</a>). Each inferior corresponds to a thread group of a special
|
|
type ‘<samp>process</samp>’, and some additional operations are permitted on
|
|
such thread groups.
|
|
</p>
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Previous: <a href="Asynchronous-and-non_002dstop-modes.html#Asynchronous-and-non_002dstop-modes" accesskey="p" rel="prev">Asynchronous and non-stop modes</a>, Up: <a href="GDB_002fMI-General-Design.html#GDB_002fMI-General-Design" accesskey="u" rel="up">GDB/MI General Design</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|