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| <h4 class="subsection">5.4.4 Thread-Specific Breakpoints</h4> |
| |
| <p>When your program has multiple threads (see <a href="Threads.html#Threads">Debugging Programs with Multiple Threads</a>), you can choose whether to set |
| breakpoints on all threads, or on a particular thread. |
| |
| |
| <a name="index-breakpoints-and-threads-345"></a> |
| <a name="index-thread-breakpoints-346"></a> |
| <a name="index-break-_0040dots_007b_007d-thread-_0040var_007bthreadno_007d-347"></a> |
| <dl><dt><code>break </code><var>linespec</var><code> thread </code><var>threadno</var><dt><code>break </code><var>linespec</var><code> thread </code><var>threadno</var><code> if ...</code><dd><var>linespec</var> specifies source lines; there are several ways of |
| writing them (see <a href="Specify-Location.html#Specify-Location">Specify Location</a>), but the effect is always to |
| specify some source line. |
| |
| <p>Use the qualifier ‘<samp><span class="samp">thread </span><var>threadno</var></samp>’ with a breakpoint command |
| to specify that you only want <span class="sc">gdb</span> to stop the program when a |
| particular thread reaches this breakpoint. <var>threadno</var> is one of the |
| numeric thread identifiers assigned by <span class="sc">gdb</span>, shown in the first |
| column of the ‘<samp><span class="samp">info threads</span></samp>’ display. |
| |
| <p>If you do not specify ‘<samp><span class="samp">thread </span><var>threadno</var></samp>’ when you set a |
| breakpoint, the breakpoint applies to <em>all</em> threads of your |
| program. |
| |
| <p>You can use the <code>thread</code> qualifier on conditional breakpoints as |
| well; in this case, place ‘<samp><span class="samp">thread </span><var>threadno</var></samp>’ before or |
| after the breakpoint condition, like this: |
| |
| <pre class="smallexample"> (gdb) break frik.c:13 thread 28 if bartab > lim |
| </pre> |
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