141 lines
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141 lines
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<title>Threads In Python - Debugging with GDB</title>
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<a name="Threads-In-Python"></a>
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Next: <a rel="next" accesskey="n" href="Recordings-In-Python.html#Recordings-In-Python">Recordings In Python</a>,
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Previous: <a rel="previous" accesskey="p" href="Events-In-Python.html#Events-In-Python">Events In Python</a>,
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<h5 class="subsubsection">23.2.2.18 Threads In Python</h5>
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<p><a name="index-threads-in-python-2095"></a>
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<a name="index-gdb_002eInferiorThread-2096"></a>Python scripts can access information about, and manipulate inferior threads
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controlled by <span class="sc">gdb</span>, via objects of the <code>gdb.InferiorThread</code> class.
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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><a name="index-gdb_002eselected_005fthread-2097"></a>
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<div class="defun">
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— Function: <b>gdb.selected_thread</b> ()<var><a name="index-gdb_002eselected_005fthread-2098"></a></var><br>
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<blockquote><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></blockquote></div>
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<p>A <code>gdb.InferiorThread</code> object has the following attributes:
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<div class="defun">
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— Variable: <b>InferiorThread.name</b><var><a name="index-InferiorThread_002ename-2099"></a></var><br>
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<blockquote><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>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></blockquote></div>
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<div class="defun">
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— Variable: <b>InferiorThread.num</b><var><a name="index-InferiorThread_002enum-2100"></a></var><br>
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<blockquote><p>The per-inferior number of the thread, as assigned by GDB.
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</p></blockquote></div>
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<div class="defun">
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— Variable: <b>InferiorThread.global_num</b><var><a name="index-InferiorThread_002eglobal_005fnum-2101"></a></var><br>
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<blockquote><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="python_005fbreakpoint_005fthread.html#python_005fbreakpoint_005fthread">The Breakpoint.thread attribute</a>).
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</p></blockquote></div>
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<div class="defun">
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— Variable: <b>InferiorThread.ptid</b><var><a name="index-InferiorThread_002eptid-2102"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Variable: <b>InferiorThread.inferior</b><var><a name="index-InferiorThread_002einferior-2103"></a></var><br>
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<blockquote><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></blockquote></div>
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<p>A <code>gdb.InferiorThread</code> object has the following methods:
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<div class="defun">
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— Function: <b>InferiorThread.is_valid</b> ()<var><a name="index-InferiorThread_002eis_005fvalid-2104"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Function: <b>InferiorThread.switch</b> ()<var><a name="index-InferiorThread_002eswitch-2105"></a></var><br>
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<blockquote><p>This changes <span class="sc">gdb</span>'s currently selected thread to the one represented
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by this object.
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</p></blockquote></div>
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<div class="defun">
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— Function: <b>InferiorThread.is_stopped</b> ()<var><a name="index-InferiorThread_002eis_005fstopped-2106"></a></var><br>
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<blockquote><p>Return a Boolean indicating whether the thread is stopped.
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</p></blockquote></div>
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<div class="defun">
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— Function: <b>InferiorThread.is_running</b> ()<var><a name="index-InferiorThread_002eis_005frunning-2107"></a></var><br>
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<blockquote><p>Return a Boolean indicating whether the thread is running.
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</p></blockquote></div>
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<div class="defun">
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— Function: <b>InferiorThread.is_exited</b> ()<var><a name="index-InferiorThread_002eis_005fexited-2108"></a></var><br>
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<blockquote><p>Return a Boolean indicating whether the thread is exited.
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</p></blockquote></div>
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