110 lines
5.8 KiB
HTML
110 lines
5.8 KiB
HTML
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<html lang="en">
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<head>
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<title>Background Execution - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Thread-Stops.html#Thread-Stops" title="Thread Stops">
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<link rel="prev" href="Non_002dStop-Mode.html#Non_002dStop-Mode" title="Non-Stop Mode">
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<link rel="next" href="Thread_002dSpecific-Breakpoints.html#Thread_002dSpecific-Breakpoints" title="Thread-Specific Breakpoints">
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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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<body>
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<div class="node">
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<a name="Background-Execution"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Thread_002dSpecific-Breakpoints.html#Thread_002dSpecific-Breakpoints">Thread-Specific Breakpoints</a>,
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Previous: <a rel="previous" accesskey="p" href="Non_002dStop-Mode.html#Non_002dStop-Mode">Non-Stop Mode</a>,
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Up: <a rel="up" accesskey="u" href="Thread-Stops.html#Thread-Stops">Thread Stops</a>
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<hr>
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</div>
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<h4 class="subsection">5.5.3 Background Execution</h4>
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<p><a name="index-foreground-execution-413"></a><a name="index-background-execution-414"></a><a name="index-asynchronous-execution-415"></a><a name="index-execution_002c-foreground_002c-background-and-asynchronous-416"></a>
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<span class="sc">gdb</span>'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, <span class="sc">gdb</span> 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, <span class="sc">gdb</span> 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>If the target doesn't support async mode, <span class="sc">gdb</span> issues an error
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message if you attempt to use the background execution commands.
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<p><a name="index-g_t_0040code_007b_0026_007d_002c-background-execution-of-commands-417"></a>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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<a name="index-run_0026-418"></a>
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<dl><dt><code>run</code><dd>See <a href="Starting.html#Starting">Starting your Program</a>.
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<br><dt><code>attach</code><dd><a name="index-attach_0026-419"></a>See <a href="Attach.html#Attach">Debugging an Already-running Process</a>.
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<br><dt><code>step</code><dd><a name="index-step_0026-420"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">step</a>.
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<br><dt><code>stepi</code><dd><a name="index-stepi_0026-421"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">stepi</a>.
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<br><dt><code>next</code><dd><a name="index-next_0026-422"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">next</a>.
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<br><dt><code>nexti</code><dd><a name="index-nexti_0026-423"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">nexti</a>.
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<br><dt><code>continue</code><dd><a name="index-continue_0026-424"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">continue</a>.
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<br><dt><code>finish</code><dd><a name="index-finish_0026-425"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">finish</a>.
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<br><dt><code>until</code><dd><a name="index-until_0026-426"></a>See <a href="Continuing-and-Stepping.html#Continuing-and-Stepping">until</a>.
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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>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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<a name="index-interrupt-427"></a>
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<dl><dt><code>interrupt</code><dt><code>interrupt -a</code><dd>
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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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</dl>
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</body></html>
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