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Diffstat (limited to 'indra/llcommon/lldeadmantimer.cpp')
| -rw-r--r-- | indra/llcommon/lldeadmantimer.cpp | 188 |
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; +} + |