Provide an iOS message pump for IO implementation.

base/message_loop.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MESSAGE_LOOP_H_
 #define BASE_MESSAGE_LOOP_H_
 
 #include <queue>
 #include <string>
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "base/message_pump.h"
 #include "base/observer_list.h"
 #include "base/pending_task.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/synchronization/lock.h"
 #include "base/tracking_info.h"
 #include "base/time.h"
 
 #if defined(OS_WIN)
 // We need this to declare base::MessagePumpWin::Dispatcher, which we should
 // really just eliminate.
 #include "base/message_pump_win.h"
+#elif defined(OS_IOS)
+#include "base/message_pump_io_ios.h"
 #elif defined(OS_POSIX)
 #include "base/message_pump_libevent.h"
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 
 #if defined(USE_AURA) && defined(USE_X11) && !defined(OS_NACL)
 #include "base/message_pump_aurax11.h"
 #else
 #include "base/message_pump_gtk.h"
 #endif
 
@@ skipping 342 matching lines @@
   bool is_running() const;
 
   //----------------------------------------------------------------------------
  protected:
   friend class base::RunLoop;
 
 #if defined(OS_WIN)
   base::MessagePumpWin* pump_win() {
     return static_cast<base::MessagePumpWin*>(pump_.get());
   }
-#elif defined(OS_POSIX)
+#elif defined(OS_POSIX) && !defined(OS_IOS)
   base::MessagePumpLibevent* pump_libevent() {
     return static_cast<base::MessagePumpLibevent*>(pump_.get());
   }
 #endif
 
   // A function to encapsulate all the exception handling capability in the
   // stacks around the running of a main message loop.  It will run the message
   // loop in a SEH try block or not depending on the set_SEH_restoration()
   // flag invoking respectively RunInternalInSEHFrame() or RunInternal().
   void RunHandler();
@@ skipping 204 matching lines @@
 //
 // This class is typically used like so:
 //   MessageLoopForIO::current()->...call some method...
 //
 class BASE_EXPORT MessageLoopForIO : public MessageLoop {
  public:
 #if defined(OS_WIN)
   typedef base::MessagePumpForIO::IOHandler IOHandler;
   typedef base::MessagePumpForIO::IOContext IOContext;
   typedef base::MessagePumpForIO::IOObserver IOObserver;
+#elif defined(OS_IOS)
+  typedef base::MessagePumpIOSForIO::Watcher Watcher;
+  typedef base::MessagePumpIOSForIO::FileDescriptorWatcher
+      FileDescriptorWatcher;
+  typedef base::MessagePumpIOSForIO::IOObserver IOObserver;
+
+  enum Mode {
+    WATCH_READ = base::MessagePumpIOSForIO::WATCH_READ,
+    WATCH_WRITE = base::MessagePumpIOSForIO::WATCH_WRITE,
+    WATCH_READ_WRITE = base::MessagePumpIOSForIO::WATCH_READ_WRITE
+  };
 #elif defined(OS_POSIX)
   typedef base::MessagePumpLibevent::Watcher Watcher;
   typedef base::MessagePumpLibevent::FileDescriptorWatcher
       FileDescriptorWatcher;
   typedef base::MessagePumpLibevent::IOObserver IOObserver;
 
   enum Mode {
     WATCH_READ = base::MessagePumpLibevent::WATCH_READ,
     WATCH_WRITE = base::MessagePumpLibevent::WATCH_WRITE,
     WATCH_READ_WRITE = base::MessagePumpLibevent::WATCH_READ_WRITE
@@ skipping 24 matching lines @@
   void RegisterIOHandler(HANDLE file, IOHandler* handler);
   bool RegisterJobObject(HANDLE job, IOHandler* handler);
   bool WaitForIOCompletion(DWORD timeout, IOHandler* filter);
 
  protected:
   // TODO(rvargas): Make this platform independent.
   base::MessagePumpForIO* pump_io() {
     return static_cast<base::MessagePumpForIO*>(pump_.get());
   }
 
+#elif defined(OS_IOS)
+  // Please see MessagePumpIOSForIO for definition.
+  bool WatchFileDescriptor(int fd,
+                           bool persistent,
+                           Mode mode,
+                           FileDescriptorWatcher *controller,
+                           Watcher *delegate);
+
+ private:
+  base::MessagePumpIOSForIO* pump_io() {
+    return static_cast<base::MessagePumpIOSForIO*>(pump_.get());
+  }
+
 #elif defined(OS_POSIX)
   // Please see MessagePumpLibevent for definition.
   bool WatchFileDescriptor(int fd,
                            bool persistent,
                            Mode mode,
                            FileDescriptorWatcher* controller,
                            Watcher* delegate);
 
  private:
   base::MessagePumpLibevent* pump_io() {
     return static_cast<base::MessagePumpLibevent*>(pump_.get());
   }
 #endif  // defined(OS_POSIX)
 };
 
 // Do not add any member variables to MessageLoopForIO!  This is important b/c
 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
 // data that you need should be stored on the MessageLoop's pump_ instance.
 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
                MessageLoopForIO_should_not_have_extra_member_variables);
 
 #endif  // BASE_MESSAGE_LOOP_H_