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<title>Debugging with GDB: Background Execution</title>
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<a name="Background-Execution"></a>
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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="previous">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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<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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<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="previous">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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