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diff --git a/share/doc/gdb/Non_002dStop-Mode.html b/share/doc/gdb/Non_002dStop-Mode.html new file mode 100644 index 0000000..4c58145 --- /dev/null +++ b/share/doc/gdb/Non_002dStop-Mode.html @@ -0,0 +1,165 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Non-Stop Mode</title> + +<meta name="description" content="Debugging with GDB: Non-Stop Mode"> +<meta name="keywords" content="Debugging with GDB: Non-Stop Mode"> +<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="Thread-Stops.html#Thread-Stops" rel="up" title="Thread Stops"> +<link href="Background-Execution.html#Background-Execution" rel="next" title="Background Execution"> +<link href="All_002dStop-Mode.html#All_002dStop-Mode" rel="previous" title="All-Stop Mode"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Non_002dStop-Mode"></a> +<div class="header"> +<p> +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="previous">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> +</div> +<hr> +<a name="Non_002dStop-Mode-1"></a> +<h4 class="subsection">5.5.2 Non-Stop Mode</h4> + +<a name="index-non_002dstop-mode"></a> + + +<p>For some multi-threaded targets, <small>GDB</small> supports an optional +mode of operation in which you can examine stopped program threads in +the debugger while other threads continue to execute freely. This +minimizes intrusion when debugging live systems, such as programs +where some threads have real-time constraints or must continue to +respond to external events. This is referred to as <em>non-stop</em> mode. +</p> +<p>In non-stop mode, when a thread stops to report a debugging event, +<em>only</em> that thread is stopped; <small>GDB</small> does not stop other +threads as well, in contrast to the all-stop mode behavior. Additionally, +execution commands such as <code>continue</code> and <code>step</code> apply by default +only to the current thread in non-stop mode, rather than all threads as +in all-stop mode. This allows you to control threads explicitly in +ways that are not possible in all-stop mode — for example, stepping +one thread while allowing others to run freely, stepping +one thread while holding all others stopped, or stepping several threads +independently and simultaneously. +</p> +<p>To enter non-stop mode, use this sequence of commands before you run +or attach to your program: +</p> +<div class="smallexample"> +<pre class="smallexample"># If using the CLI, pagination breaks non-stop. +set pagination off + +# Finally, turn it on! +set non-stop on +</pre></div> + +<p>You can use these commands to manipulate the non-stop mode setting: +</p> +<dl compact="compact"> +<dd><a name="index-set-non_002dstop"></a> +</dd> +<dt><code>set non-stop on</code></dt> +<dd><p>Enable selection of non-stop mode. +</p></dd> +<dt><code>set non-stop off</code></dt> +<dd><p>Disable selection of non-stop mode. +<a name="index-show-non_002dstop"></a> +</p></dd> +<dt><code>show non-stop</code></dt> +<dd><p>Show the current non-stop enablement setting. +</p></dd> +</dl> + +<p>Note these commands only reflect whether non-stop mode is enabled, +not whether the currently-executing program is being run in non-stop mode. +In particular, the <code>set non-stop</code> preference is only consulted when +<small>GDB</small> starts or connects to the target program, and it is generally +not possible to switch modes once debugging has started. Furthermore, +since not all targets support non-stop mode, even when you have enabled +non-stop mode, <small>GDB</small> may still fall back to all-stop operation by +default. +</p> +<p>In non-stop mode, all execution commands apply only to the current thread +by default. That is, <code>continue</code> only continues one thread. +To continue all threads, issue <code>continue -a</code> or <code>c -a</code>. +</p> +<p>You can use <small>GDB</small>’s background execution commands +(see <a href="Background-Execution.html#Background-Execution">Background Execution</a>) to run some threads in the background +while you continue to examine or step others from <small>GDB</small>. +The MI execution commands (see <a href="GDB_002fMI-Program-Execution.html#GDB_002fMI-Program-Execution">GDB/MI Program Execution</a>) are +always executed asynchronously in non-stop mode. +</p> +<p>Suspending execution is done with the <code>interrupt</code> command when +running in the background, or <kbd>Ctrl-c</kbd> during foreground execution. +In all-stop mode, this stops the whole process; +but in non-stop mode the interrupt applies only to the current thread. +To stop the whole program, use <code>interrupt -a</code>. +</p> +<p>Other execution commands do not currently support the <code>-a</code> option. +</p> +<p>In non-stop mode, when a thread stops, <small>GDB</small> doesn’t automatically make +that thread current, as it does in all-stop mode. This is because the +thread stop notifications are asynchronous with respect to <small>GDB</small>’s +command interpreter, and it would be confusing if <small>GDB</small> unexpectedly +changed to a different thread just as you entered a command to operate on the +previously current thread. +</p> +<hr> +<div class="header"> +<p> +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="previous">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> +</div> + + + +</body> +</html> |