Add note to PrivateSemaphore

emper/PrivateSemaphore.hpp

@@ -46,12 +46,18 @@ public:
 		if (Context* readyContext = signalInternal()) {
 			unblock(readyContext);
 		}
+		// Assure that nothing happens after here with the sync
+		// primitive, as the data of the sync primitive may became
+		// invalid at this point.
 	}
 
 	void signalAndExit() {
 		if (Context* readyContext = signalInternal()) {
 			unblockAndExit(readyContext);
 		}
+		// Assure that nothing happens after here with the sync
+		// primitive, as the data of the sync primitive may became
+		// invalid at this point.
 	}
 };