You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
299 lines
11 KiB
HTML
299 lines
11 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Free Software" and "Free Software Needs
|
|
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
|
|
and with the Back-Cover Texts as in (a) below.
|
|
|
|
(a) The FSF's Back-Cover Text is: "You are free to copy and modify
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
|
developing GNU and promoting software freedom." -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Ada Tasks (Debugging with GDB)</title>
|
|
|
|
<meta name="description" content="Ada Tasks (Debugging with GDB)">
|
|
<meta name="keywords" content="Ada Tasks (Debugging with GDB)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Ada.html#Ada" rel="up" title="Ada">
|
|
<link href="Ada-Tasks-and-Core-Files.html#Ada-Tasks-and-Core-Files" rel="next" title="Ada Tasks and Core Files">
|
|
<link href="Ada-Exceptions.html#Ada-Exceptions" rel="prev" title="Ada Exceptions">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<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="prev">Ada Exceptions</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>
|
|
</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>’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’s task ID (<small>GDB</small>’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 "executing" 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 detailled 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: task_1
|
|
Thread: 0
|
|
LWP: 0x1fac
|
|
Parent: 1 (main_task)
|
|
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 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 t
|
|
(gdb) task
|
|
[Current task is 2]
|
|
</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 t
|
|
(gdb) task 1
|
|
[Switching to task 1]
|
|
#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 …</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 … thread …</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 ‘<samp>task <var>taskno</var></samp>’ 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 ‘<samp>info tasks</samp>’ display.
|
|
</p>
|
|
<p>If you do not specify ‘<samp>task <var>taskno</var></samp>’ 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 ‘<samp>task <var>taskno</var></samp>’ 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="prev">Ada Exceptions</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>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|