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| <h3 class="section">5.5 Stopping and Starting Multi-thread Programs</h3> |
| |
| <p><a name="index-stopped-threads-398"></a><a name="index-threads_002c-stopped-399"></a> |
| <a name="index-continuing-threads-400"></a><a name="index-threads_002c-continuing-401"></a> |
| <span class="sc">gdb</span> supports debugging programs with multiple threads |
| (see <a href="Threads.html#Threads">Debugging Programs with Multiple Threads</a>). There |
| are two modes of controlling execution of your program within the |
| debugger. In the default mode, referred to as <dfn>all-stop mode</dfn>, |
| when any thread in your program stops (for example, at a breakpoint |
| or while being stepped), all other threads in the program are also stopped by |
| <span class="sc">gdb</span>. On some targets, <span class="sc">gdb</span> also supports |
| <dfn>non-stop mode</dfn>, in which other threads can continue to run freely while |
| you examine the stopped thread in the debugger. |
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| <ul class="menu"> |
| <li><a accesskey="1" href="All_002dStop-Mode.html#All_002dStop-Mode">All-Stop Mode</a>: All threads stop when GDB takes control |
| <li><a accesskey="2" href="Non_002dStop-Mode.html#Non_002dStop-Mode">Non-Stop Mode</a>: Other threads continue to execute |
| <li><a accesskey="3" href="Background-Execution.html#Background-Execution">Background Execution</a>: Running your program asynchronously |
| <li><a accesskey="4" href="Thread_002dSpecific-Breakpoints.html#Thread_002dSpecific-Breakpoints">Thread-Specific Breakpoints</a>: Controlling breakpoints |
| <li><a accesskey="5" href="Interrupted-System-Calls.html#Interrupted-System-Calls">Interrupted System Calls</a>: GDB may interfere with system calls |
| <li><a accesskey="6" href="Observer-Mode.html#Observer-Mode">Observer Mode</a>: GDB does not alter program behavior |
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