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Unified Diff: trunk/src/base/message_loop/message_pump_libevent.h

Issue 16897005: Revert 206507 "Move message_pump to base/message_loop." (Closed) Base URL: svn://svn.chromium.org/chrome/
Patch Set: Created 7 years, 6 months ago
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Index: trunk/src/base/message_loop/message_pump_libevent.h
===================================================================
--- trunk/src/base/message_loop/message_pump_libevent.h (revision 206508)
+++ trunk/src/base/message_loop/message_pump_libevent.h (working copy)
@@ -1,179 +0,0 @@
-// 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_MESSAGE_PUMP_LIBEVENT_H_
-#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_LIBEVENT_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_pump.h"
-#include "base/observer_list.h"
-#include "base/threading/thread_checker.h"
-#include "base/time.h"
-
-// Declare structs we need from libevent.h rather than including it
-struct event_base;
-struct event;
-
-namespace base {
-
-// Class to monitor sockets and issue callbacks when sockets are ready for I/O
-// TODO(dkegel): add support for background file IO somehow
-class BASE_EXPORT MessagePumpLibevent : public MessagePump {
- 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 MessagePumpLibevent;
- friend class MessagePumpLibeventTest;
-
- // Called by MessagePumpLibevent, ownership of |e| is transferred to this
- // object.
- void Init(event* e);
-
- // Used by MessagePumpLibevent to take ownership of event_.
- event* ReleaseEvent();
-
- void set_pump(MessagePumpLibevent* pump) { pump_ = pump; }
- MessagePumpLibevent* pump() const { return pump_; }
-
- void set_watcher(Watcher* watcher) { watcher_ = watcher; }
-
- void OnFileCanReadWithoutBlocking(int fd, MessagePumpLibevent* pump);
- void OnFileCanWriteWithoutBlocking(int fd, MessagePumpLibevent* pump);
-
- event* event_;
- MessagePumpLibevent* pump_;
- Watcher* watcher_;
- WeakPtrFactory<FileDescriptorWatcher> weak_factory_;
-
- DISALLOW_COPY_AND_ASSIGN(FileDescriptorWatcher);
- };
-
- enum Mode {
- WATCH_READ = 1 << 0,
- WATCH_WRITE = 1 << 1,
- WATCH_READ_WRITE = WATCH_READ | WATCH_WRITE
- };
-
- MessagePumpLibevent();
-
- // 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.
- // TODO(dkegel): switch to edge-triggered readiness notification
- bool WatchFileDescriptor(int fd,
- bool persistent,
- int mode,
- FileDescriptorWatcher *controller,
- Watcher *delegate);
-
- void AddIOObserver(IOObserver* obs);
- void RemoveIOObserver(IOObserver* obs);
-
- // MessagePump methods:
- virtual void Run(Delegate* delegate) OVERRIDE;
- virtual void Quit() OVERRIDE;
- virtual void ScheduleWork() OVERRIDE;
- virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) OVERRIDE;
-
- protected:
- virtual ~MessagePumpLibevent();
-
- private:
- friend class MessagePumpLibeventTest;
-
- void WillProcessIOEvent();
- void DidProcessIOEvent();
-
- // Risky part of constructor. Returns true on success.
- bool Init();
-
- // Called by libevent to tell us a registered FD can be read/written to.
- static void OnLibeventNotification(int fd, short flags,
- void* context);
-
- // Unix pipe used to implement ScheduleWork()
- // ... callback; called by libevent inside Run() when pipe is ready to read
- static void OnWakeup(int socket, short flags, void* context);
-
- // This flag is set to false when Run should return.
- bool keep_running_;
-
- // This flag is set when inside Run.
- bool in_run_;
-
- // This flag is set if libevent has processed I/O events.
- bool processed_io_events_;
-
- // The time at which we should call DoDelayedWork.
- TimeTicks delayed_work_time_;
-
- // Libevent dispatcher. Watches all sockets registered with it, and sends
- // readiness callbacks when a socket is ready for I/O.
- event_base* event_base_;
-
- // ... write end; ScheduleWork() writes a single byte to it
- int wakeup_pipe_in_;
- // ... read end; OnWakeup reads it and then breaks Run() out of its sleep
- int wakeup_pipe_out_;
- // ... libevent wrapper for read end
- event* wakeup_event_;
-
- ObserverList<IOObserver> io_observers_;
- ThreadChecker watch_file_descriptor_caller_checker_;
- DISALLOW_COPY_AND_ASSIGN(MessagePumpLibevent);
-};
-
-} // namespace base
-
-#endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_LIBEVENT_H_
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