Revert 206507 "Move message_pump to base/message_loop."

trunk/src/base/message_loop/message_pump_io_ios.cc

-// 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.
-
-#include "base/message_loop/message_pump_io_ios.h"
-
-namespace base {
-
-MessagePumpIOSForIO::FileDescriptorWatcher::FileDescriptorWatcher()
-    : is_persistent_(false),
-      fdref_(NULL),
-      callback_types_(0),
-      fd_source_(NULL),
-      pump_(NULL),
-      watcher_(NULL) {
-}
-
-MessagePumpIOSForIO::FileDescriptorWatcher::~FileDescriptorWatcher() {
-  StopWatchingFileDescriptor();
-}
-
-bool MessagePumpIOSForIO::FileDescriptorWatcher::StopWatchingFileDescriptor() {
-  if (fdref_ == NULL)
-    return true;
-
-  CFFileDescriptorDisableCallBacks(fdref_, callback_types_);
-  pump_->RemoveRunLoopSource(fd_source_);
-  fd_source_.reset();
-  fdref_.reset();
-  callback_types_ = 0;
-  pump_ = NULL;
-  watcher_ = NULL;
-  return true;
-}
-
-void MessagePumpIOSForIO::FileDescriptorWatcher::Init(
-    CFFileDescriptorRef fdref,
-    CFOptionFlags callback_types,
-    CFRunLoopSourceRef fd_source,
-    bool is_persistent) {
-  DCHECK(fdref);
-  DCHECK(!fdref_);
-
-  is_persistent_ = is_persistent;
-  fdref_.reset(fdref);
-  callback_types_ = callback_types;
-  fd_source_.reset(fd_source);
-}
-
-void MessagePumpIOSForIO::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(
-    int fd,
-    MessagePumpIOSForIO* pump) {
-  DCHECK(callback_types_ & kCFFileDescriptorReadCallBack);
-  pump->WillProcessIOEvent();
-  watcher_->OnFileCanReadWithoutBlocking(fd);
-  pump->DidProcessIOEvent();
-}
-
-void MessagePumpIOSForIO::FileDescriptorWatcher::OnFileCanWriteWithoutBlocking(
-    int fd,
-    MessagePumpIOSForIO* pump) {
-  DCHECK(callback_types_ & kCFFileDescriptorWriteCallBack);
-  pump->WillProcessIOEvent();
-  watcher_->OnFileCanWriteWithoutBlocking(fd);
-  pump->DidProcessIOEvent();
-}
-
-MessagePumpIOSForIO::MessagePumpIOSForIO() {
-}
-
-MessagePumpIOSForIO::~MessagePumpIOSForIO() {
-}
-
-bool MessagePumpIOSForIO::WatchFileDescriptor(
-    int fd,
-    bool persistent,
-    int mode,
-    FileDescriptorWatcher *controller,
-    Watcher *delegate) {
-  DCHECK_GE(fd, 0);
-  DCHECK(controller);
-  DCHECK(delegate);
-  DCHECK(mode == WATCH_READ || mode == WATCH_WRITE || mode == WATCH_READ_WRITE);
-
-  // WatchFileDescriptor should be called on the pump thread. It is not
-  // threadsafe, and your watcher may never be registered.
-  DCHECK(watch_file_descriptor_caller_checker_.CalledOnValidThread());
-
-  CFFileDescriptorContext source_context = {0};
-  source_context.info = controller;
-
-  CFOptionFlags callback_types = 0;
-  if (mode & WATCH_READ) {
-    callback_types |= kCFFileDescriptorReadCallBack;
-  }
-  if (mode & WATCH_WRITE) {
-    callback_types |= kCFFileDescriptorWriteCallBack;
-  }
-
-  CFFileDescriptorRef fdref = controller->fdref_;
-  if (fdref == NULL) {
-    base::mac::ScopedCFTypeRef<CFFileDescriptorRef> scoped_fdref(
-        CFFileDescriptorCreate(kCFAllocatorDefault, fd, false, HandleFdIOEvent,
-                               &source_context));
-    if (scoped_fdref == NULL) {
-      NOTREACHED() << "CFFileDescriptorCreate failed";
-      return false;
-    }
-
-    CFFileDescriptorEnableCallBacks(scoped_fdref, callback_types);
-
-    // TODO(wtc): what should the 'order' argument be?
-    base::mac::ScopedCFTypeRef<CFRunLoopSourceRef> scoped_fd_source(
-        CFFileDescriptorCreateRunLoopSource(kCFAllocatorDefault,
-                                            scoped_fdref,
-                                            0));
-    if (scoped_fd_source == NULL) {
-      NOTREACHED() << "CFFileDescriptorCreateRunLoopSource failed";
-      return false;
-    }
-    CFRunLoopAddSource(run_loop(), scoped_fd_source, kCFRunLoopCommonModes);
-
-    // Transfer ownership of scoped_fdref and fd_source to controller.
-    controller->Init(scoped_fdref.release(), callback_types,
-                     scoped_fd_source.release(), persistent);
-  } else {
-    // It's illegal to use this function to listen on 2 separate fds with the
-    // same |controller|.
-    if (CFFileDescriptorGetNativeDescriptor(fdref) != fd) {
-      NOTREACHED() << "FDs don't match: "
-                   << CFFileDescriptorGetNativeDescriptor(fdref)
-                   << " != " << fd;
-      return false;
-    }
-    if (persistent != controller->is_persistent_) {
-      NOTREACHED() << "persistent doesn't match";
-      return false;
-    }
-
-    // Combine old/new event masks.
-    CFFileDescriptorDisableCallBacks(fdref, controller->callback_types_);
-    controller->callback_types_ |= callback_types;
-    CFFileDescriptorEnableCallBacks(fdref, controller->callback_types_);
-  }
-
-  controller->set_watcher(delegate);
-  controller->set_pump(this);
-
-  return true;
-}
-
-void MessagePumpIOSForIO::RemoveRunLoopSource(CFRunLoopSourceRef source) {
-  CFRunLoopRemoveSource(run_loop(), source, kCFRunLoopCommonModes);
-}
-
-void MessagePumpIOSForIO::AddIOObserver(IOObserver *obs) {
-  io_observers_.AddObserver(obs);
-}
-
-void MessagePumpIOSForIO::RemoveIOObserver(IOObserver *obs) {
-  io_observers_.RemoveObserver(obs);
-}
-
-void MessagePumpIOSForIO::WillProcessIOEvent() {
-  FOR_EACH_OBSERVER(IOObserver, io_observers_, WillProcessIOEvent());
-}
-
-void MessagePumpIOSForIO::DidProcessIOEvent() {
-  FOR_EACH_OBSERVER(IOObserver, io_observers_, DidProcessIOEvent());
-}
-
-// static
-void MessagePumpIOSForIO::HandleFdIOEvent(CFFileDescriptorRef fdref,
-                                          CFOptionFlags callback_types,
-                                          void* context) {
-  FileDescriptorWatcher* controller =
-      static_cast<FileDescriptorWatcher*>(context);
-  DCHECK_EQ(fdref, controller->fdref_);
-
-  // Ensure that |fdref| will remain live for the duration of this function
-  // call even if |controller| is deleted or |StopWatchingFileDescriptor()| is
-  // called, either of which will cause |fdref| to be released.
-  mac::ScopedCFTypeRef<CFFileDescriptorRef> scoped_fdref(
-      fdref, base::scoped_policy::RETAIN);
-
-  int fd = CFFileDescriptorGetNativeDescriptor(fdref);
-  MessagePumpIOSForIO* pump = controller->pump();
-  if (callback_types & kCFFileDescriptorWriteCallBack)
-    controller->OnFileCanWriteWithoutBlocking(fd, pump);
-
-  // Perform the read callback only if the file descriptor has not been
-  // invalidated in the write callback. As |FileDescriptorWatcher| invalidates
-  // its file descriptor on destruction, the file descriptor being valid also
-  // guarantees that |controller| has not been deleted.
-  if (callback_types & kCFFileDescriptorReadCallBack &&
-      CFFileDescriptorIsValid(fdref)) {
-    DCHECK_EQ(fdref, controller->fdref_);
-    controller->OnFileCanReadWithoutBlocking(fd, pump);
-  }
-
-  // Re-enable callbacks after the read/write if the file descriptor is still
-  // valid and the controller is persistent.
-  if (CFFileDescriptorIsValid(fdref) && controller->is_persistent_) {
-    DCHECK_EQ(fdref, controller->fdref_);
-    CFFileDescriptorEnableCallBacks(fdref, callback_types);
-  }
-}
-
-}  // namespace base