1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- Copyright (C) 1988-2021 Free Software Foundation, Inc. 4 5Permission is granted to copy, distribute and/or modify this document 6under the terms of the GNU Free Documentation License, Version 1.3 or 7any later version published by the Free Software Foundation; with the 8Invariant Sections being "Free Software" and "Free Software Needs 9Free Documentation", with the Front-Cover Texts being "A GNU Manual," 10and with the Back-Cover Texts as in (a) below. 11 12(a) The FSF's Back-Cover Text is: "You are free to copy and modify 13this GNU Manual. 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This is the default. 85</p> 86<a name="index-set-ravenscar-task_002dswitching-off"></a> 87</dd> 88<dt><code>set ravenscar task-switching off</code></dt> 89<dd><p>Turn off task switching when debugging a program that uses the Ravenscar 90Profile. This is mostly intended to disable the code that adds support 91for the Ravenscar Profile, in case a bug in either <small>GDB</small> or in 92the Ravenscar runtime is preventing <small>GDB</small> from working properly. 93To be effective, this command should be run before the program is started. 94</p> 95<a name="index-show-ravenscar-task_002dswitching"></a> 96</dd> 97<dt><code>show ravenscar task-switching</code></dt> 98<dd><p>Show whether it is possible to switch from task to task in a program 99using the Ravenscar Profile. 100</p> 101</dd> 102</dl> 103 104<a name="index-Ravenscar-thread"></a> 105<p>When Ravenscar task-switching is enabled, Ravenscar tasks are 106announced by <small>GDB</small> as if they were threads: 107</p> 108<div class="smallexample"> 109<pre class="smallexample">(gdb) continue 110[New Ravenscar Thread 0x2b8f0] 111</pre></div> 112 113<p>Both Ravenscar tasks and the underlying CPU threads will show up in 114the output of <code>info threads</code>: 115</p> 116<div class="smallexample"> 117<pre class="smallexample">(gdb) info threads 118 Id Target Id Frame 119 1 Thread 1 (CPU#0 [running]) simple () at simple.adb:10 120 2 Thread 2 (CPU#1 [running]) 0x0000000000003d34 in __gnat_initialize_cpu_devices () 121 3 Thread 3 (CPU#2 [running]) 0x0000000000003d28 in __gnat_initialize_cpu_devices () 122 4 Thread 4 (CPU#3 [halted ]) 0x000000000000c6ec in system.task_primitives.operations.idle () 123* 5 Ravenscar Thread 0x2b8f0 simple () at simple.adb:10 124 6 Ravenscar Thread 0x2f150 0x000000000000c6ec in system.task_primitives.operations.idle () 125</pre></div> 126 127<p>One known limitation of the Ravenscar support in <small>GDB</small> is that 128it isn’t currently possible to single-step through the runtime 129initialization sequence. If you need to debug this code, you should 130use <code>set ravenscar task-switching off</code>. 131</p> 132<hr> 133<div class="header"> 134<p> 135Next: <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> 136</div> 137 138 139 140</body> 141</html> 142