diff --git a/src/apps/debugger/util/SignalSet.h b/src/apps/debugger/util/SignalSet.h
new file mode 100644
index 0000000000..082c9026e8
--- /dev/null
+++ b/src/apps/debugger/util/SignalSet.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright 2012, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef SIGNAL_SET_H
+#define SIGNAL_SET_H
+
+
+#include <signal.h>
+
+
+class SignalSet {
+public:
+								SignalSet();
+								SignalSet(int signal);
+								SignalSet(const sigset_t& signals);
+
+			void				SetTo(const sigset_t& signals);
+			void				SetTo(int signal);
+
+			const sigset_t&		Signals() const	{ return fSignals; }
+
+			bool				ContainsSignal(int signal) const;
+
+			SignalSet&			AddSignal(int signal);
+			SignalSet&			AddSignals(const SignalSet& signals);
+			SignalSet&			RemoveSignal(int signal);
+			SignalSet&			RemoveSignals(const SignalSet& signals);
+
+			status_t			BlockInCurrentThread(
+									SignalSet* oldMask = NULL) const;
+			status_t			UnblockInCurrentThread(
+									SignalSet* oldMask = NULL) const;
+			status_t			SetCurrentThreadSignalMask(
+									SignalSet* oldMask = NULL) const;
+
+	static	SignalSet			CurrentThreadSignalMask();
+
+private:
+			sigset_t			fSignals;
+};
+
+
+SignalSet::SignalSet()
+{
+	sigemptyset(&fSignals);
+}
+
+
+SignalSet::SignalSet(int signal)
+{
+	SetTo(signal);
+}
+
+
+SignalSet::SignalSet(const sigset_t& signals)
+	:
+	fSignals(signals)
+{
+}
+
+
+void
+SignalSet::SetTo(const sigset_t& signals)
+{
+	fSignals = signals;
+}
+
+
+void
+SignalSet::SetTo(int signal)
+{
+	sigemptyset(&fSignals);
+	sigaddset(&fSignals, signal);
+}
+
+
+bool
+SignalSet::ContainsSignal(int signal) const
+{
+	return sigismember(&fSignals, signal) != 0;
+}
+
+
+SignalSet&
+SignalSet::AddSignal(int signal)
+{
+	sigaddset(&fSignals, signal);
+	return *this;
+}
+
+
+SignalSet&
+SignalSet::AddSignals(const SignalSet& signals)
+{
+	// NOTE: That is not portable.
+	fSignals |= signals.fSignals;
+	return *this;
+}
+
+
+SignalSet&
+SignalSet::RemoveSignal(int signal)
+{
+	sigdelset(&fSignals, signal);
+	return *this;
+}
+
+
+SignalSet&
+SignalSet::RemoveSignals(const SignalSet& signals)
+{
+	// NOTE: That is not portable.
+	fSignals &= ~signals.fSignals;
+	return *this;
+}
+
+
+status_t
+SignalSet::BlockInCurrentThread(SignalSet* oldMask) const
+{
+	return pthread_sigmask(SIG_BLOCK, &fSignals,
+       oldMask != NULL ? &oldMask->fSignals : NULL);
+}
+
+
+status_t
+SignalSet::UnblockInCurrentThread(SignalSet* oldMask) const
+{
+	return pthread_sigmask(SIG_UNBLOCK, &fSignals,
+       oldMask != NULL ? &oldMask->fSignals : NULL);
+}
+
+
+status_t
+SignalSet::SetCurrentThreadSignalMask(SignalSet* oldMask) const
+{
+	return pthread_sigmask(SIG_SETMASK, &fSignals,
+       oldMask != NULL ? &oldMask->fSignals : NULL);
+}
+
+
+/*static*/ SignalSet
+SignalSet::CurrentThreadSignalMask()
+{
+	SignalSet signals;
+	pthread_sigmask(SIG_BLOCK, NULL, &signals.fSignals);
+	return signals;
+}
+
+
+#endif	// SIGNAL_SET_H