CNotifier: Provide a way to unregister a notifier temporarily

Author: https://github.com/rburchell
Commit: 7bf420d83d
Pull-request: https://github.com/SerenityOS/serenity/pull/317

Libraries/LibCore/CNotifier.cpp

@@ -6,10 +6,18 @@ CNotifier::CNotifier(int fd, unsigned event_mask)
     : m_fd(fd)
     , m_event_mask(event_mask)
 {
-    CEventLoop::register_notifier({}, *this);
+    set_enabled(true);
 }
 
 CNotifier::~CNotifier()
 {
-    CEventLoop::unregister_notifier({}, *this);
+    set_enabled(false);
+}
+
+void CNotifier::set_enabled(bool enabled)
+{
+    if (enabled)
+        CEventLoop::register_notifier({}, *this);
+    else
+        CEventLoop::unregister_notifier({}, *this);
 }

Libraries/LibCore/CNotifier.h

@@ -13,6 +13,8 @@ public:
     CNotifier(int fd, unsigned event_mask);
     ~CNotifier();
 
+    void set_enabled(bool);
+
     Function<void()> on_ready_to_read;
     Function<void()> on_ready_to_write;