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<title>Debugging with GDB: Ada Tasks</title>

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<a name="Ada-Tasks"></a>
<div class="header">
<p>
Next: <a href="Ada-Tasks-and-Core-Files.html#Ada-Tasks-and-Core-Files" accesskey="n" rel="next">Ada Tasks and Core Files</a>, Previous: <a href="Ada-Exceptions.html#Ada-Exceptions" accesskey="p" rel="previous">Ada Exceptions</a>, Up: <a href="Ada.html#Ada" accesskey="u" rel="up">Ada</a> &nbsp; [<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>
</div>
<hr>
<a name="Extensions-for-Ada-Tasks"></a>
<h4 class="subsubsection">15.4.10.7 Extensions for Ada Tasks</h4>
<a name="index-Ada_002c-tasking"></a>

<p>Support for Ada tasks is analogous to that for threads (see <a href="Threads.html#Threads">Threads</a>).
<small>GDB</small> provides the following task-related commands:
</p>
<dl compact="compact">
<dd><a name="index-info-tasks"></a>
</dd>
<dt><code>info tasks</code></dt>
<dd><p>This command shows a list of current Ada tasks, as in the following example:
</p>

<div class="smallexample">
<pre class="smallexample">(gdb) info tasks
  ID       TID P-ID Pri State                 Name
   1   8088000   0   15 Child Activation Wait main_task
   2   80a4000   1   15 Accept Statement      b
   3   809a800   1   15 Child Activation Wait a
*  4   80ae800   3   15 Runnable              c

</pre></div>

<p>In this listing, the asterisk before the last task indicates it to be the
task currently being inspected.
</p>
<dl compact="compact">
<dt>ID</dt>
<dd><p>Represents <small>GDB</small>&rsquo;s internal task number.
</p>
</dd>
<dt>TID</dt>
<dd><p>The Ada task ID.
</p>
</dd>
<dt>P-ID</dt>
<dd><p>The parent&rsquo;s task ID (<small>GDB</small>&rsquo;s internal task number).
</p>
</dd>
<dt>Pri</dt>
<dd><p>The base priority of the task.
</p>
</dd>
<dt>State</dt>
<dd><p>Current state of the task.
</p>
<dl compact="compact">
<dt><code>Unactivated</code></dt>
<dd><p>The task has been created but has not been activated.  It cannot be
executing.
</p>
</dd>
<dt><code>Runnable</code></dt>
<dd><p>The task is not blocked for any reason known to Ada.  (It may be waiting
for a mutex, though.) It is conceptually &quot;executing&quot; in normal mode.
</p>
</dd>
<dt><code>Terminated</code></dt>
<dd><p>The task is terminated, in the sense of ARM 9.3 (5).  Any dependents
that were waiting on terminate alternatives have been awakened and have
terminated themselves.
</p>
</dd>
<dt><code>Child Activation Wait</code></dt>
<dd><p>The task is waiting for created tasks to complete activation.
</p>
</dd>
<dt><code>Accept Statement</code></dt>
<dd><p>The task is waiting on an accept or selective wait statement.
</p>
</dd>
<dt><code>Waiting on entry call</code></dt>
<dd><p>The task is waiting on an entry call.
</p>
</dd>
<dt><code>Async Select Wait</code></dt>
<dd><p>The task is waiting to start the abortable part of an asynchronous
select statement.
</p>
</dd>
<dt><code>Delay Sleep</code></dt>
<dd><p>The task is waiting on a select statement with only a delay
alternative open.
</p>
</dd>
<dt><code>Child Termination Wait</code></dt>
<dd><p>The task is sleeping having completed a master within itself, and is
waiting for the tasks dependent on that master to become terminated or
waiting on a terminate Phase.
</p>
</dd>
<dt><code>Wait Child in Term Alt</code></dt>
<dd><p>The task is sleeping waiting for tasks on terminate alternatives to
finish terminating.
</p>
</dd>
<dt><code>Accepting RV with <var>taskno</var></code></dt>
<dd><p>The task is accepting a rendez-vous with the task <var>taskno</var>.
</p></dd>
</dl>

</dd>
<dt>Name</dt>
<dd><p>Name of the task in the program.
</p>
</dd>
</dl>

<a name="index-info-task-taskno"></a>
</dd>
<dt><code>info task <var>taskno</var></code></dt>
<dd><p>This command shows detailed informations on the specified task, as in
the following example:
</p><div class="smallexample">
<pre class="smallexample">(gdb) info tasks
  ID       TID P-ID Pri State                  Name
   1   8077880    0  15 Child Activation Wait  main_task
*  2   807c468    1  15 Runnable               task_1
(gdb) info task 2
Ada Task: 0x807c468
Name: &quot;task_1&quot;
Thread: 0
LWP: 0x1fac
Parent: 1 (&quot;main_task&quot;)
Base Priority: 15
State: Runnable
</pre></div>

</dd>
<dt><code>task</code></dt>
<dd><a name="index-task-_0028Ada_0029"></a>
<a name="index-current-Ada-task-ID"></a>
<p>This command prints the ID and name of the current task.
</p>
<div class="smallexample">
<pre class="smallexample">(gdb) info tasks
  ID       TID P-ID Pri State                  Name
   1   8077870    0  15 Child Activation Wait  main_task
*  2   807c458    1  15 Runnable               some_task
(gdb) task
[Current task is 2 &quot;some_task&quot;]
</pre></div>

</dd>
<dt><code>task <var>taskno</var></code></dt>
<dd><a name="index-Ada-task-switching"></a>
<p>This command is like the <code>thread <var>thread-id</var></code>
command (see <a href="Threads.html#Threads">Threads</a>).  It switches the context of debugging
from the current task to the given task.
</p>
<div class="smallexample">
<pre class="smallexample">(gdb) info tasks
  ID       TID P-ID Pri State                  Name
   1   8077870    0  15 Child Activation Wait  main_task
*  2   807c458    1  15 Runnable               some_task
(gdb) task 1
[Switching to task 1 &quot;main_task&quot;]
#0  0x8067726 in pthread_cond_wait ()
(gdb) bt
#0  0x8067726 in pthread_cond_wait ()
#1  0x8056714 in system.os_interface.pthread_cond_wait ()
#2  0x805cb63 in system.task_primitives.operations.sleep ()
#3  0x806153e in system.tasking.stages.activate_tasks ()
#4  0x804aacc in un () at un.adb:5
</pre></div>

</dd>
<dt><code>break <var>location</var> task <var>taskno</var></code></dt>
<dt><code>break <var>location</var> task <var>taskno</var> if &hellip;</code></dt>
<dd><a name="index-breakpoints-and-tasks_002c-in-Ada"></a>
<a name="index-task-breakpoints_002c-in-Ada"></a>
<a name="index-break-_2026-task-taskno-_0028Ada_0029"></a>
<p>These commands are like the <code>break &hellip; thread &hellip;</code>
command (see <a href="Thread-Stops.html#Thread-Stops">Thread Stops</a>).  The
<var>location</var> argument specifies source lines, as described
in <a href="Specify-Location.html#Specify-Location">Specify Location</a>.
</p>
<p>Use the qualifier &lsquo;<samp>task <var>taskno</var></samp>&rsquo; with a breakpoint command
to specify that you only want <small>GDB</small> to stop the program when a
particular Ada task reaches this breakpoint.  The <var>taskno</var> is one of the
numeric task identifiers assigned by <small>GDB</small>, shown in the first
column of the &lsquo;<samp>info tasks</samp>&rsquo; display.
</p>
<p>If you do not specify &lsquo;<samp>task <var>taskno</var></samp>&rsquo; when you set a
breakpoint, the breakpoint applies to <em>all</em> tasks of your
program.
</p>
<p>You can use the <code>task</code> qualifier on conditional breakpoints as
well; in this case, place &lsquo;<samp>task <var>taskno</var></samp>&rsquo; before the
breakpoint condition (before the <code>if</code>).
</p>
<p>For example,
</p>
<div class="smallexample">
<pre class="smallexample">(gdb) info tasks
  ID       TID P-ID Pri State                 Name
   1 140022020   0   15 Child Activation Wait main_task
   2 140045060   1   15 Accept/Select Wait    t2
   3 140044840   1   15 Runnable              t1
*  4 140056040   1   15 Runnable              t3
(gdb) b 15 task 2
Breakpoint 5 at 0x120044cb0: file test_task_debug.adb, line 15.
(gdb) cont
Continuing.
task # 1 running
task # 2 running

Breakpoint 5, test_task_debug () at test_task_debug.adb:15
15               flush;
(gdb) info tasks
  ID       TID P-ID Pri State                 Name
   1 140022020   0   15 Child Activation Wait main_task
*  2 140045060   1   15 Runnable              t2
   3 140044840   1   15 Runnable              t1
   4 140056040   1   15 Delay Sleep           t3
</pre></div>
</dd>
</dl>

<hr>
<div class="header">
<p>
Next: <a href="Ada-Tasks-and-Core-Files.html#Ada-Tasks-and-Core-Files" accesskey="n" rel="next">Ada Tasks and Core Files</a>, Previous: <a href="Ada-Exceptions.html#Ada-Exceptions" accesskey="p" rel="previous">Ada Exceptions</a>, Up: <a href="Ada.html#Ada" accesskey="u" rel="up">Ada</a> &nbsp; [<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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