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- Next: <a href="Target-Commands.html#Target-Commands" accesskey="n" rel="next">Target Commands</a>, Up: <a href="Targets.html#Targets" accesskey="u" rel="up">Targets</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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- <h3 class="section">19.1 Active Targets</h3>
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- <a name="index-stacking-targets"></a>
- <a name="index-active-targets"></a>
- <a name="index-multiple-targets"></a>
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- <p>There are multiple classes of targets such as: processes, executable files or
- recording sessions. Core files belong to the process class, making core file
- and process mutually exclusive. Otherwise, <small>GDB</small> can work concurrently
- on multiple active targets, one in each class. This allows you to (for
- example) start a process and inspect its activity, while still having access to
- the executable file after the process finishes. Or if you start process
- recording (see <a href="Reverse-Execution.html#Reverse-Execution">Reverse Execution</a>) and <code>reverse-step</code> there, you are
- presented a virtual layer of the recording target, while the process target
- remains stopped at the chronologically last point of the process execution.
- </p>
- <p>Use the <code>core-file</code> and <code>exec-file</code> commands to select a new core
- file or executable target (see <a href="Files.html#Files">Commands to Specify Files</a>). To
- specify as a target a process that is already running, use the <code>attach</code>
- command (see <a href="Attach.html#Attach">Debugging an Already-running Process</a>).
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