text: /** 
   * @file lltiming_test.cpp
   * @date 2006-07-23
   * @brief Tests the timers.
   *
   * $LicenseInfo:firstyear=2006&license=viewerlgpl$
   * Second Life Viewer Source Code
   * Copyright (C) 2010, 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
   * $/LicenseInfo$
   */
  
  #include "linden_common.h"
  
  #include "../llframetimer.h"
  #include "../llsd.h"
  
  #include "../test/lltut.h"
  
  namespace tut
  {
  	struct frametimer_test
  	{
  		frametimer_test()
  		{
  			LLFrameTimer::updateFrameTime();			
  		}
  	};
  	typedef test_group<frametimer_test> frametimer_group_t;
  	typedef frametimer_group_t::object frametimer_object_t;
  	tut::frametimer_group_t frametimer_instance("LLFrameTimer");
  
  	template<> template<>
  	void frametimer_object_t::test<1>()
  	{
  		F64 seconds_since_epoch = LLFrameTimer::getTotalSeconds();
  		LLFrameTimer timer;
  		timer.setExpiryAt(seconds_since_epoch);
  		F64 expires_at = timer.expiresAt();
  		ensure_distance(
  			"set expiry matches get expiry",
  			expires_at,
  			seconds_since_epoch,
  			0.001);
  	}
  
  	template<> template<>
  	void frametimer_object_t::test<2>()
  	{
  		F64 seconds_since_epoch = LLFrameTimer::getTotalSeconds();
  		seconds_since_epoch += 10.0;
  		LLFrameTimer timer;
  		timer.setExpiryAt(seconds_since_epoch);
  		F64 expires_at = timer.expiresAt();
  		ensure_distance(
  			"set expiry matches get expiry 1",
  			expires_at,
  			seconds_since_epoch,
  			0.001);
  		seconds_since_epoch += 10.0;
  		timer.setExpiryAt(seconds_since_epoch);
  		expires_at = timer.expiresAt();
  		ensure_distance(
  			"set expiry matches get expiry 2",
  			expires_at,
  			seconds_since_epoch,
  			0.001);
  	}
  	template<> template<>
  	void frametimer_object_t::test<3>()
  	{
  		clock_t t1 = clock();
  		ms_sleep(200);
  		clock_t t2 = clock();
  		clock_t elapsed = t2 - t1 + 1;
  		std::cout << "Note: using clock(), ms_sleep() actually took " << (long)elapsed << "ms" << std::endl;
  
  		F64 seconds_since_epoch = LLFrameTimer::getTotalSeconds();
  		seconds_since_epoch += 2.0;
  		LLFrameTimer timer;
  		timer.setExpiryAt(seconds_since_epoch);
  		/*
  		 * Note that the ms_sleep(200) below is only guaranteed to return
  		 * in 200ms _or_more_, so it should be true that by the 10th
  		 * iteration we've gotten to the 2 seconds requested above
  		 * and the timer should expire, but it can expire in fewer iterations
  		 * if one or more of the ms_sleep calls takes longer.
  		 * (as it did when we moved to Mac OS X 10.10)
  		 */
  		int iterations_until_expiration = 0;
  		while ( !timer.hasExpired() )
  		{
  			ms_sleep(200);
  			LLFrameTimer::updateFrameTime();
  			iterations_until_expiration++;
  		}
  		ensure("timer took too long to expire", iterations_until_expiration <= 10);
  	}
  	
  /*
  	template<> template<>
  	void frametimer_object_t::test<4>()
  	{
  	}
  */
  }
  