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| <h3 class="section">19.1 Active Targets</h3> |
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| <p><a name="index-stacking-targets-1036"></a><a name="index-active-targets-1037"></a><a name="index-multiple-targets-1038"></a> |
| 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, <span class="sc">gdb</span> 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>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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