Pull merge from viewer-release

1 files changed, 188 insertions, 0 deletions

diff --git a/indra/llcommon/lldeadmantimer.cpp b/indra/llcommon/lldeadmantimer.cpp
new file mode 100644
index 0000000000..7d9097e344
--- /dev/null
+++ b/indra/llcommon/lldeadmantimer.cpp
@@ -0,0 +1,188 @@
+/** 
+* @file lldeadmantimer.cpp
+* @brief Simple deadman-switch timer.
+* @author monty@lindenlab.com
+*
+* $LicenseInfo:firstyear=2013&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2013, 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 "lldeadmantimer.h"
+
+
+// *TODO:  Currently, this uses lltimer functions for its time
+// aspects and this leaks into the apis in the U64s/F64s.  Would
+// like to perhaps switch this over to TSC register-based timers
+// sometime and drop the overhead some more.
+
+
+//  Flag states and their meaning:
+//  mActive  mDone   Meaning
+//   false   false   Nothing running, no result available
+//    true   false   Timer running, no result available
+//   false    true   Timer finished, result can be read once
+//    true    true   Not allowed
+//
+LLDeadmanTimer::LLDeadmanTimer(F64 horizon, bool inc_cpu)
+	: mHorizon(time_type(llmax(horizon, F64(0.0)) * gClockFrequency)),
+	  mActive(false),			// If true, a timer is running.
+	  mDone(false),				// If true, timer has completed and can be read (once)
+	  mStarted(U64L(0)),
+	  mExpires(U64L(0)),
+	  mStopped(U64L(0)),
+	  mCount(U64L(0)),
+	  mIncCPU(inc_cpu),
+	  mUStartCPU(LLProcInfo::time_type(U64L(0))),
+	  mUEndCPU(LLProcInfo::time_type(U64L(0))),
+	  mSStartCPU(LLProcInfo::time_type(U64L(0))),
+	  mSEndCPU(LLProcInfo::time_type(U64L(0)))
+{}
+
+
+// static
+LLDeadmanTimer::time_type LLDeadmanTimer::getNow()
+{
+	return LLTimer::getCurrentClockCount();
+}
+
+
+void LLDeadmanTimer::start(time_type now)
+{
+	// *TODO:  If active, let's complete an existing timer and save
+	// the result to the side.  I think this will be useful later.
+	// For now, wipe out anything in progress, start fresh.
+	
+	if (! now)
+	{
+		now = LLTimer::getCurrentClockCount();
+	}
+	mActive = true;
+	mDone = false;
+	mStarted = now;
+	mExpires = now + mHorizon;
+	mStopped = now;
+	mCount = U64L(0);
+	if (mIncCPU)
+	{
+		LLProcInfo::getCPUUsage(mUStartCPU, mSStartCPU);
+	}
+}
+
+
+void LLDeadmanTimer::stop(time_type now)
+{
+	if (! mActive)
+	{
+		return;
+	}
+
+	if (! now)
+	{
+		now = getNow();
+	}
+	mStopped = now;
+	mActive = false;
+	mDone = true;
+	if (mIncCPU)
+	{
+		LLProcInfo::getCPUUsage(mUEndCPU, mSEndCPU);
+	}
+}
+
+
+bool LLDeadmanTimer::isExpired(time_type now, F64 & started, F64 & stopped, U64 & count,
+							   U64 & user_cpu, U64 & sys_cpu)
+{
+	const bool status(isExpired(now, started, stopped, count));
+	if (status)
+	{
+		user_cpu = U64(mUEndCPU - mUStartCPU);
+		sys_cpu = U64(mSEndCPU - mSStartCPU);
+	}
+	return status;
+}
+
+		
+bool LLDeadmanTimer::isExpired(time_type now, F64 & started, F64 & stopped, U64 & count)
+{
+	if (mActive && ! mDone)
+	{
+		if (! now)
+		{
+			now = getNow();
+		}
+
+		if (now >= mExpires)
+		{
+			// mStopped from ringBell() is the value we want
+			mActive = false;
+			mDone = true;
+		}
+	}
+
+	if (! mDone)
+	{
+		return false;
+	}
+	
+	started = mStarted * gClockFrequencyInv;
+	stopped = mStopped * gClockFrequencyInv;
+	count = mCount;
+	mDone = false;
+
+	return true;
+}
+
+	
+void LLDeadmanTimer::ringBell(time_type now, unsigned int count)
+{
+	if (! mActive)
+	{
+		return;
+	}
+	
+	if (! now)
+	{
+		now = getNow();
+	}
+
+	if (now >= mExpires)
+	{
+		// Timer has expired, this event will be dropped
+		mActive = false;
+		mDone = true;
+	}
+	else
+	{
+		// Timer renewed, keep going
+		mStopped = now;
+		mExpires = now + mHorizon;
+		mCount += count;
+		if (mIncCPU)
+		{
+			LLProcInfo::getCPUUsage(mUEndCPU, mSEndCPU);
+		}
+	}
+	
+	return;
+}
+