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165 lines
7.7 KiB
HTML
165 lines
7.7 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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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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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>Non-Stop Mode (Debugging with GDB)</title>
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<meta name="description" content="Non-Stop Mode (Debugging with GDB)">
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<meta name="keywords" content="Non-Stop Mode (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="Thread-Stops.html#Thread-Stops" rel="up" title="Thread Stops">
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<link href="Background-Execution.html#Background-Execution" rel="next" title="Background Execution">
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<link href="All_002dStop-Mode.html#All_002dStop-Mode" rel="prev" title="All-Stop Mode">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Non_002dStop-Mode"></a>
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<div class="header">
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<p>
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Next: <a href="Background-Execution.html#Background-Execution" accesskey="n" rel="next">Background Execution</a>, Previous: <a href="All_002dStop-Mode.html#All_002dStop-Mode" accesskey="p" rel="prev">All-Stop Mode</a>, Up: <a href="Thread-Stops.html#Thread-Stops" accesskey="u" rel="up">Thread Stops</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="Non_002dStop-Mode-1"></a>
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<h4 class="subsection">5.5.2 Non-Stop Mode</h4>
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<a name="index-non_002dstop-mode"></a>
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<p>For some multi-threaded targets, <small>GDB</small> supports an optional
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mode of operation in which you can examine stopped program threads in
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the debugger while other threads continue to execute freely. This
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minimizes intrusion when debugging live systems, such as programs
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where some threads have real-time constraints or must continue to
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respond to external events. This is referred to as <em>non-stop</em> mode.
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</p>
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<p>In non-stop mode, when a thread stops to report a debugging event,
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<em>only</em> that thread is stopped; <small>GDB</small> does not stop other
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threads as well, in contrast to the all-stop mode behavior. Additionally,
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execution commands such as <code>continue</code> and <code>step</code> apply by default
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only to the current thread in non-stop mode, rather than all threads as
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in all-stop mode. This allows you to control threads explicitly in
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ways that are not possible in all-stop mode — for example, stepping
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one thread while allowing others to run freely, stepping
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one thread while holding all others stopped, or stepping several threads
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independently and simultaneously.
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</p>
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<p>To enter non-stop mode, use this sequence of commands before you run
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or attach to your program:
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</p>
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<div class="smallexample">
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<pre class="smallexample"># If using the CLI, pagination breaks non-stop.
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set pagination off
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# Finally, turn it on!
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set non-stop on
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</pre></div>
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<p>You can use these commands to manipulate the non-stop mode setting:
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</p>
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<dl compact="compact">
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<dd><a name="index-set-non_002dstop"></a>
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</dd>
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<dt><code>set non-stop on</code></dt>
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<dd><p>Enable selection of non-stop mode.
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</p></dd>
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<dt><code>set non-stop off</code></dt>
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<dd><p>Disable selection of non-stop mode.
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<a name="index-show-non_002dstop"></a>
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</p></dd>
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<dt><code>show non-stop</code></dt>
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<dd><p>Show the current non-stop enablement setting.
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</p></dd>
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</dl>
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<p>Note these commands only reflect whether non-stop mode is enabled,
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not whether the currently-executing program is being run in non-stop mode.
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In particular, the <code>set non-stop</code> preference is only consulted when
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<small>GDB</small> starts or connects to the target program, and it is generally
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not possible to switch modes once debugging has started. Furthermore,
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since not all targets support non-stop mode, even when you have enabled
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non-stop mode, <small>GDB</small> may still fall back to all-stop operation by
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default.
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</p>
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<p>In non-stop mode, all execution commands apply only to the current thread
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by default. That is, <code>continue</code> only continues one thread.
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To continue all threads, issue <code>continue -a</code> or <code>c -a</code>.
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</p>
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<p>You can use <small>GDB</small>’s background execution commands
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(see <a href="Background-Execution.html#Background-Execution">Background Execution</a>) to run some threads in the background
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while you continue to examine or step others from <small>GDB</small>.
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The MI execution commands (see <a href="GDB_002fMI-Program-Execution.html#GDB_002fMI-Program-Execution">GDB/MI Program Execution</a>) are
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always executed asynchronously in non-stop mode.
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</p>
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<p>Suspending execution is done with the <code>interrupt</code> command when
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running in the background, or <kbd>Ctrl-c</kbd> during foreground execution.
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In all-stop mode, this stops the whole process;
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but in non-stop mode the interrupt applies only to the current thread.
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To stop the whole program, use <code>interrupt -a</code>.
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</p>
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<p>Other execution commands do not currently support the <code>-a</code> option.
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</p>
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<p>In non-stop mode, when a thread stops, <small>GDB</small> doesn’t automatically make
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that thread current, as it does in all-stop mode. This is because the
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thread stop notifications are asynchronous with respect to <small>GDB</small>’s
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command interpreter, and it would be confusing if <small>GDB</small> unexpectedly
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changed to a different thread just as you entered a command to operate on the
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previously current thread.
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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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Next: <a href="Background-Execution.html#Background-Execution" accesskey="n" rel="next">Background Execution</a>, Previous: <a href="All_002dStop-Mode.html#All_002dStop-Mode" accesskey="p" rel="prev">All-Stop Mode</a>, Up: <a href="Thread-Stops.html#Thread-Stops" accesskey="u" rel="up">Thread Stops</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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