Use libevent, second try. Changes this time:...

base/message_loop.h

 // Copyright (c) 2006-2008 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 <deque>
 #include <queue>
 #include <string>
 #include <vector>
 
 #include "base/histogram.h"
 #include "base/message_pump.h"
 #include "base/observer_list.h"
 #include "base/ref_counted.h"
 #include "base/task.h"
 #include "base/timer.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_POSIX)
+#include "base/message_pump_libevent.h"
 #endif
 
 // A MessageLoop is used to process events for a particular thread.  There is
 // at most one MessageLoop instance per thread.
 //
 // Events include at a minimum Task instances submitted to PostTask or those
 // managed by TimerManager.  Depending on the type of message pump used by the
 // MessageLoop other events such as UI messages may be processed.  On Windows
 // APC calls (as time permits) and signals sent to a registered set of HANDLEs
 // may also be processed.
@@ skipping 233 matching lines @@
     bool operator<(const PendingTask& other) const;
   };
 
   typedef std::queue<PendingTask> TaskQueue;
   typedef std::priority_queue<PendingTask> DelayedTaskQueue;
 
 #if defined(OS_WIN)
   base::MessagePumpWin* pump_win() {
     return static_cast<base::MessagePumpWin*>(pump_.get());
   }
+#elif defined(OS_POSIX)
+  base::MessagePumpLibevent* pump_libevent() {
+    return static_cast<base::MessagePumpLibevent*>(pump_.get());
+  }
+ protected:
 #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.
   void RunHandler();
 
   // A surrounding stack frame around the running of the message loop that
   // supports all saving and restoring of state, as is needed for any/all (ugly)
@@ skipping 156 matching lines @@
     MessageLoop* loop = MessageLoop::current();
     DCHECK_EQ(MessageLoop::TYPE_IO, loop->type());
     return static_cast<MessageLoopForIO*>(loop);
   }
 
 #if defined(OS_WIN)
   typedef base::MessagePumpWin::Watcher Watcher;
 
   // Please see MessagePumpWin for definitions of these methods.
   void WatchObject(HANDLE object, Watcher* watcher);
+
+#elif defined(OS_POSIX)
+  typedef base::MessagePumpLibevent::Watcher Watcher;
+
+  // Please see MessagePumpLibevent for definitions of these methods.
+  void WatchSocket(int socket, short interest_mask, 
+                   struct event* e, Watcher* watcher);
+  void UnwatchSocket(struct event* e);
 #endif  // defined(OS_WIN)
 };
 
 // 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_