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<title>Debugging with GDB: Ravenscar Profile</title>
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<a name="Ravenscar-Profile"></a>
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<div class="header">
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<p>
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Next: <a href="Ada-Settings.html#Ada-Settings" accesskey="n" rel="next">Ada Settings</a>, Previous: <a href="Ada-Tasks-and-Core-Files.html#Ada-Tasks-and-Core-Files" accesskey="p" rel="previous">Ada Tasks and Core Files</a>, Up: <a href="Ada.html#Ada" accesskey="u" rel="up">Ada</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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<hr>
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<a name="Tasking-Support-When-Using-the-Ravenscar-Profile"></a>
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<h4 class="subsubsection">15.4.10.9 Tasking Support When Using the Ravenscar Profile</h4>
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<a name="index-Ravenscar-Profile"></a>
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<p>The <em>Ravenscar Profile</em> is a subset of the Ada tasking features,
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specifically designed for systems with safety-critical real-time
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requirements.
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</p>
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<dl compact="compact">
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<dd><a name="index-set-ravenscar-task_002dswitching-on"></a>
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<a name="index-task-switching-with-program-using-Ravenscar-Profile"></a>
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</dd>
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<dt><code>set ravenscar task-switching on</code></dt>
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<dd><p>Allows task switching when debugging a program that uses the Ravenscar
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Profile. This is the default.
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</p>
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<a name="index-set-ravenscar-task_002dswitching-off"></a>
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</dd>
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<dt><code>set ravenscar task-switching off</code></dt>
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<dd><p>Turn off task switching when debugging a program that uses the Ravenscar
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Profile. This is mostly intended to disable the code that adds support
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for the Ravenscar Profile, in case a bug in either <small>GDB</small> or in
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the Ravenscar runtime is preventing <small>GDB</small> from working properly.
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To be effective, this command should be run before the program is started.
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</p>
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<a name="index-show-ravenscar-task_002dswitching"></a>
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</dd>
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<dt><code>show ravenscar task-switching</code></dt>
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<dd><p>Show whether it is possible to switch from task to task in a program
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using the Ravenscar Profile.
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</p>
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</dd>
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</dl>
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<a name="index-Ravenscar-thread"></a>
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<p>When Ravenscar task-switching is enabled, Ravenscar tasks are
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announced by <small>GDB</small> as if they were threads:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) continue
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[New Ravenscar Thread 0x2b8f0]
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</pre></div>
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<p>Both Ravenscar tasks and the underlying CPU threads will show up in
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the output of <code>info threads</code>:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) info threads
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Id Target Id Frame
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1 Thread 1 (CPU#0 [running]) simple () at simple.adb:10
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2 Thread 2 (CPU#1 [running]) 0x0000000000003d34 in __gnat_initialize_cpu_devices ()
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3 Thread 3 (CPU#2 [running]) 0x0000000000003d28 in __gnat_initialize_cpu_devices ()
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4 Thread 4 (CPU#3 [halted ]) 0x000000000000c6ec in system.task_primitives.operations.idle ()
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* 5 Ravenscar Thread 0x2b8f0 simple () at simple.adb:10
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6 Ravenscar Thread 0x2f150 0x000000000000c6ec in system.task_primitives.operations.idle ()
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</pre></div>
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<p>One known limitation of the Ravenscar support in <small>GDB</small> is that
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it isn’t currently possible to single-step through the runtime
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initialization sequence. If you need to debug this code, you should
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use <code>set ravenscar task-switching off</code>.
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</p>
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Next: <a href="Ada-Settings.html#Ada-Settings" accesskey="n" rel="next">Ada Settings</a>, Previous: <a href="Ada-Tasks-and-Core-Files.html#Ada-Tasks-and-Core-Files" accesskey="p" rel="previous">Ada Tasks and Core Files</a>, Up: <a href="Ada.html#Ada" accesskey="u" rel="up">Ada</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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