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170 lines
7.8 KiB
HTML
170 lines
7.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Threads In Python (Debugging with GDB)</title>
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<meta name="description" content="Threads In Python (Debugging with GDB)">
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<meta name="keywords" content="Threads In Python (Debugging with GDB)">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Python-API.html#Python-API" rel="up" title="Python API">
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<link href="Recordings-In-Python.html#Recordings-In-Python" rel="next" title="Recordings In Python">
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<link href="Events-In-Python.html#Events-In-Python" rel="prev" title="Events In Python">
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</style>
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</head>
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<body lang="en">
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<a name="Threads-In-Python"></a>
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<div class="header">
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<p>
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Next: <a href="Recordings-In-Python.html#Recordings-In-Python" accesskey="n" rel="next">Recordings In Python</a>, Previous: <a href="Events-In-Python.html#Events-In-Python" accesskey="p" rel="prev">Events In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</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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</div>
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<hr>
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<a name="Threads-In-Python-1"></a>
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<h4 class="subsubsection">23.2.2.18 Threads In Python</h4>
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<a name="index-threads-in-python"></a>
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<a name="index-gdb_002eInferiorThread"></a>
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<p>Python scripts can access information about, and manipulate inferior threads
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controlled by <small>GDB</small>, via objects of the <code>gdb.InferiorThread</code> class.
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</p>
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<p>The following thread-related functions are available in the <code>gdb</code>
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module:
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</p>
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<a name="index-gdb_002eselected_005fthread"></a>
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<dl>
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<dt><a name="index-gdb_002eselected_005fthread-1"></a>Function: <strong>gdb.selected_thread</strong> <em>()</em></dt>
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<dd><p>This function returns the thread object for the selected thread. If there
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is no selected thread, this will return <code>None</code>.
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</p></dd></dl>
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<p>A <code>gdb.InferiorThread</code> object has the following attributes:
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</p>
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<dl>
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<dt><a name="index-InferiorThread_002ename"></a>Variable: <strong>InferiorThread.name</strong></dt>
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<dd><p>The name of the thread. If the user specified a name using
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<code>thread name</code>, then this returns that name. Otherwise, if an
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OS-supplied name is available, then it is returned. Otherwise, this
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returns <code>None</code>.
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</p>
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<p>This attribute can be assigned to. The new value must be a string
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object, which sets the new name, or <code>None</code>, which removes any
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user-specified thread name.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002enum"></a>Variable: <strong>InferiorThread.num</strong></dt>
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<dd><p>The per-inferior number of the thread, as assigned by GDB.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002eglobal_005fnum"></a>Variable: <strong>InferiorThread.global_num</strong></dt>
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<dd><p>The global ID of the thread, as assigned by GDB. You can use this to
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make Python breakpoints thread-specific, for example
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(see <a href="Breakpoints-In-Python.html#python_005fbreakpoint_005fthread">The Breakpoint.thread attribute</a>).
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002eptid"></a>Variable: <strong>InferiorThread.ptid</strong></dt>
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<dd><p>ID of the thread, as assigned by the operating system. This attribute is a
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tuple containing three integers. The first is the Process ID (PID); the second
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is the Lightweight Process ID (LWPID), and the third is the Thread ID (TID).
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Either the LWPID or TID may be 0, which indicates that the operating system
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does not use that identifier.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002einferior"></a>Variable: <strong>InferiorThread.inferior</strong></dt>
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<dd><p>The inferior this thread belongs to. This attribute is represented as
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a <code>gdb.Inferior</code> object. This attribute is not writable.
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</p></dd></dl>
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<p>A <code>gdb.InferiorThread</code> object has the following methods:
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</p>
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<dl>
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<dt><a name="index-InferiorThread_002eis_005fvalid"></a>Function: <strong>InferiorThread.is_valid</strong> <em>()</em></dt>
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<dd><p>Returns <code>True</code> if the <code>gdb.InferiorThread</code> object is valid,
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<code>False</code> if not. A <code>gdb.InferiorThread</code> object will become
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invalid if the thread exits, or the inferior that the thread belongs
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is deleted. All other <code>gdb.InferiorThread</code> methods will throw an
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exception if it is invalid at the time the method is called.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002eswitch"></a>Function: <strong>InferiorThread.switch</strong> <em>()</em></dt>
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<dd><p>This changes <small>GDB</small>’s currently selected thread to the one represented
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by this object.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002eis_005fstopped"></a>Function: <strong>InferiorThread.is_stopped</strong> <em>()</em></dt>
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<dd><p>Return a Boolean indicating whether the thread is stopped.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002eis_005frunning"></a>Function: <strong>InferiorThread.is_running</strong> <em>()</em></dt>
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<dd><p>Return a Boolean indicating whether the thread is running.
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</p></dd></dl>
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<dl>
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<dt><a name="index-InferiorThread_002eis_005fexited"></a>Function: <strong>InferiorThread.is_exited</strong> <em>()</em></dt>
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<dd><p>Return a Boolean indicating whether the thread is exited.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Recordings-In-Python.html#Recordings-In-Python" accesskey="n" rel="next">Recordings In Python</a>, Previous: <a href="Events-In-Python.html#Events-In-Python" accesskey="p" rel="prev">Events In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</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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</div>
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</body>
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</html>
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