/** 
 * @file _thread.h
 * @brief thread type abstraction
 *
 * $LicenseInfo:firstyear=2012&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2012, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LLCOREINT_THREAD_H_
#define LLCOREINT_THREAD_H_

#include <boost/thread.hpp>
#include <boost/function.hpp>


#include "_refcounted.h"

namespace LLCoreInt
{

class HttpThread : public RefCounted
{
private:
	HttpThread();							// Not defined
	void operator=(const HttpThread &);		// Not defined

	void at_exit()
		{
			// the thread function has exited so we need to release our reference
			// to ourself so that we will be automagically cleaned up.
			release();
		}

	void run()
		{ // THREAD CONTEXT 

			// The implicit reference to this object is taken for the at_exit
			// function so that the HttpThread instance doesn't disappear out
			// from underneath it.  Other holders of the object may want to
			// take a reference as well.
			boost::this_thread::at_thread_exit(boost::bind(&HttpThread::at_exit, this));

			// run the thread function
			mThreadFunc(this);

		} // THREAD CONTEXT

public:
	/// Constructs a thread object for concurrent execution but does
	/// not start running.  Unlike other classes that mixin RefCounted,
	/// this does take out a reference but it is used internally for
	/// final cleanup during at_exit processing.  Callers needing to
	/// keep a reference must increment it themselves.
	///
	explicit HttpThread(boost::function<void (HttpThread *)> threadFunc)
		: RefCounted(true), // implicit reference
		  mThreadFunc(threadFunc)
		{
			// this creates a boost thread that will call HttpThread::run on this instance
			// and pass it the threadfunc callable...
			boost::function<void()> f = boost::bind(&HttpThread::run, this);

			mThread = new boost::thread(f);
		}

	virtual ~HttpThread()
		{
			delete mThread;
		}

	inline void join()
		{
			mThread->join();
		}

	inline bool joinable() const
		{
			return mThread->joinable();
		}

private:
	boost::function<void(HttpThread *)> mThreadFunc;
	boost::thread * mThread;
}; // end class HttpThread

} // end namespace LLCoreInt

#endif // LLCOREINT_THREAD_H_