Index: src/libcfa/concurrency/preemption.c
===================================================================
--- src/libcfa/concurrency/preemption.c	(revision 399a908cc97cdaad27d16bbf3d5672d0e4db6110)
+++ src/libcfa/concurrency/preemption.c	(revision c5e5109b1c35d53310f804ccda60fc251d7eab1f)
@@ -404,4 +404,23 @@
 }
 
+//=============================================================================================
+// Kernel Signal Debug
+//=============================================================================================
+
+void __cfaabi_check_preemption() {
+	bool ready = TL_GET( preemption_state ).enabled;
+	if(!ready) { abort("Preemption should be ready"); }
+
+	sigset_t oldset;
+	int ret;
+	ret = sigprocmask(0, NULL, &oldset);
+	if(ret != 0) { abort("ERROR sigprocmask returned %d", ret); }
+
+	ret = sigismember(&oldset, SIGUSR1);
+	if(ret <  0) { abort("ERROR sigismember returned %d", ret); }
+
+	if(ret == 1) { abort("ERROR SIGUSR1 is disabled"); }
+}
+
 // Local Variables: //
 // mode: c //