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175 lines
7.5 KiB
HTML
175 lines
7.5 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>Background Execution (Debugging with GDB)</title>
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<meta name="description" content="Background Execution (Debugging with GDB)">
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<meta name="keywords" content="Background Execution (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="Thread_002dSpecific-Breakpoints.html#Thread_002dSpecific-Breakpoints" rel="next" title="Thread-Specific Breakpoints">
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<link href="Non_002dStop-Mode.html#Non_002dStop-Mode" rel="prev" title="Non-Stop Mode">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.smallindentedblock {margin-right: 0em; 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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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.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="Background-Execution"></a>
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<div class="header">
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<p>
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Next: <a href="Thread_002dSpecific-Breakpoints.html#Thread_002dSpecific-Breakpoints" accesskey="n" rel="next">Thread-Specific Breakpoints</a>, Previous: <a href="Non_002dStop-Mode.html#Non_002dStop-Mode" accesskey="p" rel="prev">Non-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="Background-Execution-1"></a>
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<h4 class="subsection">5.5.3 Background Execution</h4>
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<a name="index-foreground-execution"></a>
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<a name="index-background-execution"></a>
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<a name="index-asynchronous-execution"></a>
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<a name="index-execution_002c-foreground_002c-background-and-asynchronous"></a>
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<p><small>GDB</small>’s execution commands have two variants: the normal
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foreground (synchronous) behavior, and a background
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(asynchronous) behavior. In foreground execution, <small>GDB</small> waits for
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the program to report that some thread has stopped before prompting for
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another command. In background execution, <small>GDB</small> immediately gives
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a command prompt so that you can issue other commands while your program runs.
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</p>
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<p>If the target doesn’t support async mode, <small>GDB</small> issues an error
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message if you attempt to use the background execution commands.
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</p>
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<a name="index-_0026_002c-background-execution-of-commands"></a>
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<p>To specify background execution, add a <code>&</code> to the command. For example,
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the background form of the <code>continue</code> command is <code>continue&</code>, or
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just <code>c&</code>. The execution commands that accept background execution
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are:
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</p>
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<dl compact="compact">
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<dd><a name="index-run_0026"></a>
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</dd>
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<dt><code>run</code></dt>
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<dd><p>See <a href="Starting.html#Starting">Starting your Program</a>.
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</p>
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</dd>
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<dt><code>attach</code></dt>
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<dd><a name="index-attach_0026"></a>
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<p>See <a href="Attach.html#Attach">Debugging an Already-running Process</a>.
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</p>
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</dd>
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<dt><code>step</code></dt>
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<dd><a name="index-step_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">step</a>.
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</p>
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</dd>
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<dt><code>stepi</code></dt>
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<dd><a name="index-stepi_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">stepi</a>.
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</p>
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</dd>
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<dt><code>next</code></dt>
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<dd><a name="index-next_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">next</a>.
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</p>
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</dd>
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<dt><code>nexti</code></dt>
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<dd><a name="index-nexti_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">nexti</a>.
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</p>
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</dd>
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<dt><code>continue</code></dt>
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<dd><a name="index-continue_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">continue</a>.
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</p>
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</dd>
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<dt><code>finish</code></dt>
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<dd><a name="index-finish_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">finish</a>.
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</p>
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</dd>
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<dt><code>until</code></dt>
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<dd><a name="index-until_0026"></a>
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<p>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">until</a>.
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</p>
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</dd>
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</dl>
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<p>Background execution is especially useful in conjunction with non-stop
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mode for debugging programs with multiple threads; see <a href="Non_002dStop-Mode.html#Non_002dStop-Mode">Non-Stop Mode</a>.
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However, you can also use these commands in the normal all-stop mode with
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the restriction that you cannot issue another execution command until the
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previous one finishes. Examples of commands that are valid in all-stop
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mode while the program is running include <code>help</code> and <code>info break</code>.
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</p>
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<p>You can interrupt your program while it is running in the background by
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using the <code>interrupt</code> command.
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</p>
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<dl compact="compact">
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<dd><a name="index-interrupt-1"></a>
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</dd>
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<dt><code>interrupt</code></dt>
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<dt><code>interrupt -a</code></dt>
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<dd>
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<p>Suspend execution of the running program. In all-stop mode,
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<code>interrupt</code> stops the whole process, but in non-stop mode, it stops
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only the current thread. To stop the whole program in non-stop mode,
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use <code>interrupt -a</code>.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Thread_002dSpecific-Breakpoints.html#Thread_002dSpecific-Breakpoints" accesskey="n" rel="next">Thread-Specific Breakpoints</a>, Previous: <a href="Non_002dStop-Mode.html#Non_002dStop-Mode" accesskey="p" rel="prev">Non-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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