Signals

When one of the threads belonging to the debugged program receives a signal, an event occurs in the debugger; the debugger can react by stopping and prompting the user for a command (an action).

The debugger normally delivers the signal to the debuggee after that

You may tell the debugger not to stop (not to prompt you for a command) when a signal occurs, and also not to re-deliver that signal to the debugged program; to specify the desired behavior, go to the Edit --> Options menu, and select the Signals tab.