Revert 206507 "Move message_pump to base/message_loop."

trunk/src/base/message_loop/message_pump_io_ios.h

-// Copyright 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_MESSAGE_PUMP_IO_IOS_H_
-#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_IO_IOS_H_
-
-#include "base/base_export.h"
-#include "base/mac/scoped_cffiledescriptorref.h"
-#include "base/mac/scoped_cftyperef.h"
-#include "base/memory/ref_counted.h"
-#include "base/message_loop/message_pump_mac.h"
-#include "base/observer_list.h"
-
-namespace base {
-
-// This file introduces a class to monitor sockets and issue callbacks when
-// sockets are ready for I/O on iOS.
-class BASE_EXPORT MessagePumpIOSForIO : public MessagePumpNSRunLoop {
- public:
-  class IOObserver {
-   public:
-    IOObserver() {}
-
-    // An IOObserver is an object that receives IO notifications from the
-    // MessagePump.
-    //
-    // NOTE: An IOObserver implementation should be extremely fast!
-    virtual void WillProcessIOEvent() = 0;
-    virtual void DidProcessIOEvent() = 0;
-
-   protected:
-    virtual ~IOObserver() {}
-  };
-
-  // Used with WatchFileDescriptor to asynchronously monitor the I/O readiness
-  // of a file descriptor.
-  class Watcher {
-   public:
-    // Called from MessageLoop::Run when an FD can be read from/written to
-    // without blocking
-    virtual void OnFileCanReadWithoutBlocking(int fd) = 0;
-    virtual void OnFileCanWriteWithoutBlocking(int fd) = 0;
-
-   protected:
-    virtual ~Watcher() {}
-  };
-
-  // Object returned by WatchFileDescriptor to manage further watching.
-  class FileDescriptorWatcher {
-   public:
-    FileDescriptorWatcher();
-    ~FileDescriptorWatcher();  // Implicitly calls StopWatchingFileDescriptor.
-
-    // NOTE: These methods aren't called StartWatching()/StopWatching() to
-    // avoid confusion with the win32 ObjectWatcher class.
-
-    // Stop watching the FD, always safe to call.  No-op if there's nothing
-    // to do.
-    bool StopWatchingFileDescriptor();
-
-   private:
-    friend class MessagePumpIOSForIO;
-    friend class MessagePumpIOSForIOTest;
-
-    // Called by MessagePumpIOSForIO, ownership of |fdref| and |fd_source|
-    // is transferred to this object.
-    void Init(CFFileDescriptorRef fdref,
-              CFOptionFlags callback_types,
-              CFRunLoopSourceRef fd_source,
-              bool is_persistent);
-
-    void set_pump(MessagePumpIOSForIO* pump) { pump_ = pump; }
-    MessagePumpIOSForIO* pump() const { return pump_; }
-
-    void set_watcher(Watcher* watcher) { watcher_ = watcher; }
-
-    void OnFileCanReadWithoutBlocking(int fd, MessagePumpIOSForIO* pump);
-    void OnFileCanWriteWithoutBlocking(int fd, MessagePumpIOSForIO* pump);
-
-    bool is_persistent_;  // false if this event is one-shot.
-    base::mac::ScopedCFFileDescriptorRef fdref_;
-    CFOptionFlags callback_types_;
-    base::mac::ScopedCFTypeRef<CFRunLoopSourceRef> fd_source_;
-    scoped_refptr<MessagePumpIOSForIO> pump_;
-    Watcher* watcher_;
-
-    DISALLOW_COPY_AND_ASSIGN(FileDescriptorWatcher);
-  };
-
-  enum Mode {
-    WATCH_READ = 1 << 0,
-    WATCH_WRITE = 1 << 1,
-    WATCH_READ_WRITE = WATCH_READ | WATCH_WRITE
-  };
-
-  MessagePumpIOSForIO();
-
-  // Have the current thread's message loop watch for a a situation in which
-  // reading/writing to the FD can be performed without blocking.
-  // Callers must provide a preallocated FileDescriptorWatcher object which
-  // can later be used to manage the lifetime of this event.
-  // If a FileDescriptorWatcher is passed in which is already attached to
-  // an event, then the effect is cumulative i.e. after the call |controller|
-  // will watch both the previous event and the new one.
-  // If an error occurs while calling this method in a cumulative fashion, the
-  // event previously attached to |controller| is aborted.
-  // Returns true on success.
-  // Must be called on the same thread the message_pump is running on.
-  bool WatchFileDescriptor(int fd,
-                           bool persistent,
-                           int mode,
-                           FileDescriptorWatcher *controller,
-                           Watcher *delegate);
-
-  void RemoveRunLoopSource(CFRunLoopSourceRef source);
-
-  void AddIOObserver(IOObserver* obs);
-  void RemoveIOObserver(IOObserver* obs);
-
- protected:
-  virtual ~MessagePumpIOSForIO();
-
- private:
-  friend class MessagePumpIOSForIOTest;
-
-  void WillProcessIOEvent();
-  void DidProcessIOEvent();
-
-  static void HandleFdIOEvent(CFFileDescriptorRef fdref,
-                              CFOptionFlags callback_types,
-                              void* context);
-
-  ObserverList<IOObserver> io_observers_;
-  ThreadChecker watch_file_descriptor_caller_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessagePumpIOSForIO);
-};
-
-}  // namespace base
-
-#endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_IO_IOS_H_