demo: make cancel_blocking working

- remove special handling from base-nova
- add to rpc_server where it actually should be applied to
- required to work for sel4 cancel_blocking

Issue #2044

repos/base-nova/src/lib/base/rpc_entrypoint.cc

@@ -87,13 +87,6 @@ void Rpc_entrypoint::_dissolve(Rpc_object_base *obj)
 	if (utcb == reinterpret_cast<Utcb *>(this->utcb()))
 		return;
 
-	/*
-	 * Required outside of core. E.g. launchpad needs it to forcefully kill
-	 * a client which blocks on a session opening request where the service
-	 * is not up yet.
-	 */
-	cancel_blocking();
-
 	/* activate entrypoint now - otherwise cleanup call will block forever */
 	_delay_start.unlock();
 

repos/base/include/base/rpc_server.h

@@ -442,6 +442,13 @@ class Genode::Rpc_entrypoint : Thread, public Object_pool<Rpc_object_base>
 		 * This method is solely needed on Linux.
 		 */
 		bool is_myself() const;
+
+		/**
+		 * Required outside of core. E.g. launchpad needs it to forcefully kill
+		 * a client which blocks on a session opening request where the service
+		 * is not up yet.
+		 */
+		void cancel_blocking() { Thread::cancel_blocking(); }
 };
 
 #endif /* _INCLUDE__BASE__RPC_SERVER_H_ */

repos/demo/include/launchpad/launchpad.h

@@ -206,6 +206,12 @@ class Launchpad_child : public Genode::List<Launchpad_child>::Element
 					_entrypoint.activate();
 				}
 
+			/**
+			 * Required to forcefully kill client which blocks on a session
+			 * opening quest where the service is not up yet.
+			 */
+			void cancel_blocking() { _entrypoint.cancel_blocking(); }
+
 			Genode::Rom_session_capability rom_session_cap() { return _rom; }
 			Genode::Ram_session_capability ram_session_cap() { return _ram; }
 			Genode::Cpu_session_capability cpu_session_cap() { return _cpu; }

repos/demo/src/lib/launchpad/launchpad.cc

@@ -394,7 +394,7 @@ class Child_destructor_thread : Thread_deprecated<2*4096>
 					 * bit to proceed and reset the watchdog counter to give
 					 * the next blocking operation a chance to execute.
 					 */
-					cancel_blocking();
+					child->cancel_blocking();
 					_watchdog_cnt = 0;
 				}
 			}