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171 lines
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<title>GDB/MI Thread Commands - Debugging with GDB</title>
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<link rel="prev" href="GDB_002fMI-Program-Context.html#GDB_002fMI-Program-Context" title="GDB/MI Program Context">
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<link rel="next" href="GDB_002fMI-Ada-Tasking-Commands.html#GDB_002fMI-Ada-Tasking-Commands" title="GDB/MI Ada Tasking Commands">
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<div class="node">
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<a name="GDB%2fMI-Thread-Commands"></a>
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<a name="GDB_002fMI-Thread-Commands"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="GDB_002fMI-Ada-Tasking-Commands.html#GDB_002fMI-Ada-Tasking-Commands">GDB/MI Ada Tasking Commands</a>,
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Previous: <a rel="previous" accesskey="p" href="GDB_002fMI-Program-Context.html#GDB_002fMI-Program-Context">GDB/MI Program Context</a>,
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Up: <a rel="up" accesskey="u" href="GDB_002fMI.html#GDB_002fMI">GDB/MI</a>
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<hr>
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</div>
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<h3 class="section">27.11 <span class="sc">gdb/mi</span> Thread Commands</h3>
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<h4 class="subheading">The <code>-thread-info</code> Command</h4>
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<p><a name="index-g_t_002dthread_002dinfo-3004"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -thread-info [ <var>thread-id</var> ]
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</pre>
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<p>Reports information about either a specific thread, if the
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<var>thread-id</var> parameter is present, or about all threads.
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<var>thread-id</var> is the thread's global thread ID. When printing
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information about all threads, also reports the global ID of the
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current thread.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>The ‘<samp><span class="samp">info thread</span></samp>’ command prints the same information
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about all threads.
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<h5 class="subsubheading">Result</h5>
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<p>The result contains the following attributes:
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<dl>
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<dt>‘<samp><span class="samp">threads</span></samp>’<dd>A list of threads. The format of the elements of the list is described in
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<a href="GDB_002fMI-Thread-Information.html#GDB_002fMI-Thread-Information">GDB/MI Thread Information</a>.
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<br><dt>‘<samp><span class="samp">current-thread-id</span></samp>’<dd>The global id of the currently selected thread. This field is omitted if there
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is no selected thread (for example, when the selected inferior is not running,
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and therefore has no threads) or if a <var>thread-id</var> argument was passed to
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the command.
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</dl>
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<h5 class="subsubheading">Example</h5>
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<pre class="smallexample"> -thread-info
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^done,threads=[
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{id="2",target-id="Thread 0xb7e14b90 (LWP 21257)",
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frame={level="0",addr="0xffffe410",func="__kernel_vsyscall",
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args=[]},state="running"},
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{id="1",target-id="Thread 0xb7e156b0 (LWP 21254)",
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frame={level="0",addr="0x0804891f",func="foo",
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args=[{name="i",value="10"}],
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file="/tmp/a.c",fullname="/tmp/a.c",line="158",arch="i386:x86_64"},
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state="running"}],
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current-thread-id="1"
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(gdb)
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</pre>
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<h4 class="subheading">The <code>-thread-list-ids</code> Command</h4>
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<p><a name="index-g_t_002dthread_002dlist_002dids-3005"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -thread-list-ids
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</pre>
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<p>Produces a list of the currently known global <span class="sc">gdb</span> thread ids.
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At the end of the list it also prints the total number of such
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threads.
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<p>This command is retained for historical reasons, the
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<code>-thread-info</code> command should be used instead.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>Part of ‘<samp><span class="samp">info threads</span></samp>’ supplies the same information.
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<h5 class="subsubheading">Example</h5>
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<pre class="smallexample"> (gdb)
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-thread-list-ids
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^done,thread-ids={thread-id="3",thread-id="2",thread-id="1"},
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current-thread-id="1",number-of-threads="3"
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(gdb)
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</pre>
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<h4 class="subheading">The <code>-thread-select</code> Command</h4>
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<p><a name="index-g_t_002dthread_002dselect-3006"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -thread-select <var>thread-id</var>
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</pre>
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<p>Make thread with global thread number <var>thread-id</var> the current
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thread. It prints the number of the new current thread, and the
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topmost frame for that thread.
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<p>This command is deprecated in favor of explicitly using the
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‘<samp><span class="samp">--thread</span></samp>’ option to each command.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>The corresponding <span class="sc">gdb</span> command is ‘<samp><span class="samp">thread</span></samp>’.
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<h5 class="subsubheading">Example</h5>
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<pre class="smallexample"> (gdb)
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-exec-next
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^running
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(gdb)
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*stopped,reason="end-stepping-range",thread-id="2",line="187",
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file="../../../devo/gdb/testsuite/gdb.threads/linux-dp.c"
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(gdb)
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-thread-list-ids
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^done,
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thread-ids={thread-id="3",thread-id="2",thread-id="1"},
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number-of-threads="3"
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(gdb)
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-thread-select 3
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^done,new-thread-id="3",
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frame={level="0",func="vprintf",
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args=[{name="format",value="0x8048e9c \"%*s%c %d %c\\n\""},
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{name="arg",value="0x2"}],file="vprintf.c",line="31",arch="i386:x86_64"}
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(gdb)
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</pre>
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<!-- %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -->
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</body></html>
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