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120 lines
6.2 KiB
HTML
120 lines
6.2 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Thread groups (Debugging with GDB)</title>
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<meta name="description" content="Thread groups (Debugging with GDB)">
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<meta name="keywords" content="Thread groups (Debugging with GDB)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="GDB_002fMI-General-Design.html#GDB_002fMI-General-Design" rel="up" title="GDB/MI General Design">
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<link href="GDB_002fMI-Command-Syntax.html#GDB_002fMI-Command-Syntax" rel="next" title="GDB/MI Command Syntax">
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<link href="Asynchronous-and-non_002dstop-modes.html#Asynchronous-and-non_002dstop-modes" rel="prev" title="Asynchronous and non-stop modes">
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</head>
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<body lang="en">
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<a name="Thread-groups"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Thread-groups-1"></a>
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<h4 class="subsection">27.1.3 Thread groups</h4>
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<p><small>GDB</small> may be used to debug several processes at the same time.
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On some platfroms, <small>GDB</small> may support debugging of several
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hardware systems, each one having several cores with several different
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processes running on each core. This section describes the MI
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mechanism to support such debugging scenarios.
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</p>
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<p>The key observation is that regardless of the structure of the
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target, MI can have a global list of threads, because most commands that
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accept the ‘<samp>--thread</samp>’ option do not need to know what process that
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thread belongs to. Therefore, it is not necessary to introduce
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neither additional ‘<samp>--process</samp>’ option, nor an notion of the
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current process in the MI interface. The only strictly new feature
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that is required is the ability to find how the threads are grouped
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into processes.
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</p>
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<p>To allow the user to discover such grouping, and to support arbitrary
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hierarchy of machines/cores/processes, MI introduces the concept of a
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<em>thread group</em>. Thread group is a collection of threads and other
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thread groups. A thread group always has a string identifier, a type,
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and may have additional attributes specific to the type. A new
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command, <code>-list-thread-groups</code>, returns the list of top-level
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thread groups, which correspond to processes that <small>GDB</small> is
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debugging at the moment. By passing an identifier of a thread group
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to the <code>-list-thread-groups</code> command, it is possible to obtain
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the members of specific thread group.
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</p>
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<p>To allow the user to easily discover processes, and other objects, he
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wishes to debug, a concept of <em>available thread group</em> is
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introduced. Available thread group is an thread group that
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<small>GDB</small> is not debugging, but that can be attached to, using the
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<code>-target-attach</code> command. The list of available top-level thread
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groups can be obtained using ‘<samp>-list-thread-groups --available</samp>’.
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In general, the content of a thread group may be only retrieved only
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after attaching to that thread group.
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</p>
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<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
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type ‘<samp>process</samp>’, and some additional operations are permitted on
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such thread groups.
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</p>
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<hr>
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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