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The Threads Window

The threads window is displayed using View|Threads. The threads window lists the active threads of the program.

Note: Debugging threaded programs must be supported by the version of gdb that is used - it is not a feature of KDbg. For Linux systems this works best with gdb5 and later. However, at the time of this writing gdb still poorly supports threads on NPTL- (New Posix Threads Library) enabled systems (glibc 2.3.x and kernel 2.6.x).

The contents of the threads window are updated every time the program is stopped by the debugger. (That is, the window does not reflect the state while the program is running.)

The first column shows the thread ID, the second column identifies the location where the thread currently executes.

The marker in front of the line tells which thread currently is active:

• The stack window displays the active threads's backtrace.
• The local variables window displays the active thread's local variables.
• The watch window uses the active thread's local variables to evaluate the expressions.

By clicking a listed thread, the active thread is switched, and the corresponding windows are updated. In particular, the source window displays the location where the active thread is currently halted.