Merge downstream code

2 files changed, 719 insertions, 0 deletions

diff --git a/indra/llcommon/tests/lldeadmantimer_test.cpp b/indra/llcommon/tests/lldeadmantimer_test.cpp
new file mode 100644
index 0000000000..7fd2dde6e0
--- /dev/null
+++ b/indra/llcommon/tests/lldeadmantimer_test.cpp
@@ -0,0 +1,628 @@
+/** 
+ * @file lldeadmantimer_test.cpp
+ * @brief Tests for the LLDeadmanTimer class.
+ *
+ * $LicenseInfo:firstyear=2013&license=viewerlgpl$
+ * 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 "linden_common.h"
+
+#include "../lldeadmantimer.h"
+#include "../llsd.h"
+#include "../lltimer.h"
+
+#include "../test/lltut.h"
+
+// Convert between floating point time deltas and U64 time deltas.
+// Reflects an implementation detail inside lldeadmantimer.cpp
+
+static LLDeadmanTimer::time_type float_time_to_u64(F64 delta)
+{
+	return LLDeadmanTimer::time_type(delta * gClockFrequency);
+}
+
+static F64 u64_time_to_float(LLDeadmanTimer::time_type delta)
+{
+	return delta * gClockFrequencyInv;
+}
+
+
+namespace tut
+{
+
+struct deadmantimer_test
+{
+	deadmantimer_test()
+		{
+			// LLTimer internals updating
+			update_clock_frequencies();
+		}
+};
+
+typedef test_group<deadmantimer_test> deadmantimer_group_t;
+typedef deadmantimer_group_t::object deadmantimer_object_t;
+tut::deadmantimer_group_t deadmantimer_instance("LLDeadmanTimer");
+
+// Basic construction test and isExpired() call
+template<> template<>
+void deadmantimer_object_t::test<1>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(10.0, false);
+
+		ensure_equals("WOCM isExpired() returns false after ctor()", timer.isExpired(0, started, stopped, count), false);
+		ensure_approximately_equals("WOCM t1 - isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WOCM t1 - isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WOCM t1 - isExpired() does not modify count", count, U64L(8));
+	}
+
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(10.0, true);
+
+		ensure_equals("WCM isExpired() returns false after ctor()", timer.isExpired(0, started, stopped, count, user_cpu, sys_cpu), false);
+		ensure_approximately_equals("WCM t1 - isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WCM t1 - isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WCM t1 - isExpired() does not modify count", count, U64L(8));
+		ensure_equals("WCM t1 - isExpired() does not modify user_cpu", user_cpu, U64L(29000));
+		ensure_equals("WCM t1 - isExpired() does not modify sys_cpu", sys_cpu, U64L(57000));
+	}
+}
+
+
+// Construct with zero horizon - not useful generally but will be useful in testing
+template<> template<>
+void deadmantimer_object_t::test<2>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(0.0, false);			// Zero is pre-expired
+		
+		ensure_equals("WOCM isExpired() still returns false with 0.0 time ctor()",
+					  timer.isExpired(0, started, stopped, count), false);
+	}
+
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(0.0, true);			// Zero is pre-expired
+		
+		ensure_equals("WCM isExpired() still returns false with 0.0 time ctor()",
+					  timer.isExpired(0, started, stopped, count, user_cpu, sys_cpu), false);
+	}
+}
+
+
+// "pre-expired" timer - starting a timer with a 0.0 horizon will result in
+// expiration on first test.
+template<> template<>
+void deadmantimer_object_t::test<3>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(0.0, false);
+
+		timer.start(0);
+		ensure_equals("WOCM isExpired() returns true with 0.0 horizon time",
+					  timer.isExpired(0, started, stopped, count), true);
+ 		ensure_approximately_equals("WOCM expired timer with no bell ringing has stopped == started", started, stopped, 8);
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(0.0, true);
+
+		timer.start(0);
+		ensure_equals("WCM isExpired() returns true with 0.0 horizon time",
+					  timer.isExpired(0, started, stopped, count, user_cpu, sys_cpu), true);
+		ensure_approximately_equals("WCM expired timer with no bell ringing has stopped == started", started, stopped, 8);
+	}
+}
+
+
+// "pre-expired" timer - bell rings are ignored as we're already expired.
+template<> template<>
+void deadmantimer_object_t::test<4>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(0.0, false);
+	
+		timer.start(0);
+		timer.ringBell(LLDeadmanTimer::getNow() + float_time_to_u64(1000.0), 1);
+		ensure_equals("WOCM isExpired() returns true with 0.0 horizon time after bell ring",
+					  timer.isExpired(0, started, stopped, count), true);
+		ensure_approximately_equals("WOCM ringBell has no impact on expired timer leaving stopped == started", started, stopped, 8);
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(0.0, true);
+	
+		timer.start(0);
+		timer.ringBell(LLDeadmanTimer::getNow() + float_time_to_u64(1000.0), 1);
+		ensure_equals("WCM isExpired() returns true with 0.0 horizon time after bell ring",
+					  timer.isExpired(0, started, stopped, count, user_cpu, sys_cpu), true);
+		ensure_approximately_equals("WCM ringBell has no impact on expired timer leaving stopped == started", started, stopped, 8);
+	}
+}
+
+
+// start(0) test - unexpired timer reports unexpired
+template<> template<>
+void deadmantimer_object_t::test<5>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(10.0, false);
+	
+		timer.start(0);
+		ensure_equals("WOCM isExpired() returns false after starting with 10.0 horizon time",
+					  timer.isExpired(0, started, stopped, count), false);
+		ensure_approximately_equals("WOCM t5 - isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WOCM t5 - isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WOCM t5 - isExpired() does not modify count", count, U64L(8));
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(10.0, true);
+	
+		timer.start(0);
+		ensure_equals("WCM isExpired() returns false after starting with 10.0 horizon time",
+					  timer.isExpired(0, started, stopped, count, user_cpu, sys_cpu), false);
+		ensure_approximately_equals("WCM t5 - isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WCM t5 - isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WCM t5 - isExpired() does not modify count", count, U64L(8));
+		ensure_equals("WCM t5 - isExpired() does not modify user_cpu", user_cpu, U64L(29000));
+		ensure_equals("WCM t5 - isExpired() does not modify sys_cpu", sys_cpu, U64L(57000));
+	}
+}
+
+
+// start() test - start in the past but not beyond 1 horizon
+template<> template<>
+void deadmantimer_object_t::test<6>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(10.0, false);
+
+		// Would like to do subtraction on current time but can't because
+		// the implementation on Windows is zero-based.  We wrap around
+		// the backside resulting in a large U64 number.
+	
+		LLDeadmanTimer::time_type the_past(LLDeadmanTimer::getNow());
+		LLDeadmanTimer::time_type now(the_past + float_time_to_u64(5.0));
+		timer.start(the_past);
+		ensure_equals("WOCM t6 - isExpired() returns false with 10.0 horizon time starting 5.0 in past",
+					  timer.isExpired(now, started, stopped, count), false);
+		ensure_approximately_equals("WOCM t6 - isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WOCM t6 - isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WOCM t6 - isExpired() does not modify count", count, U64L(8));
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(10.0, true);
+
+		// Would like to do subtraction on current time but can't because
+		// the implementation on Windows is zero-based.  We wrap around
+		// the backside resulting in a large U64 number.
+	
+		LLDeadmanTimer::time_type the_past(LLDeadmanTimer::getNow());
+		LLDeadmanTimer::time_type now(the_past + float_time_to_u64(5.0));
+		timer.start(the_past);
+		ensure_equals("WCM t6 - isExpired() returns false with 10.0 horizon time starting 5.0 in past",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+		ensure_approximately_equals("WCM t6 - isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WCM t6 - isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("t6 - isExpired() does not modify count", count, U64L(8));
+		ensure_equals("WCM t6 - isExpired() does not modify user_cpu", user_cpu, U64L(29000));
+		ensure_equals("WCM t6 - isExpired() does not modify sys_cpu", sys_cpu, U64L(57000));
+	}
+}
+
+
+// start() test - start in the past but well beyond 1 horizon
+template<> template<>
+void deadmantimer_object_t::test<7>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(10.0, false);
+		
+		// Would like to do subtraction on current time but can't because
+		// the implementation on Windows is zero-based.  We wrap around
+		// the backside resulting in a large U64 number.
+	
+		LLDeadmanTimer::time_type the_past(LLDeadmanTimer::getNow());
+		LLDeadmanTimer::time_type now(the_past + float_time_to_u64(20.0));
+		timer.start(the_past);
+		ensure_equals("WOCM t7 - isExpired() returns true with 10.0 horizon time starting 20.0 in past",
+					  timer.isExpired(now,started, stopped, count), true);
+		ensure_approximately_equals("WOCM t7 - starting before horizon still gives equal started / stopped", started, stopped, 8);
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(10.0, true);
+		
+		// Would like to do subtraction on current time but can't because
+		// the implementation on Windows is zero-based.  We wrap around
+		// the backside resulting in a large U64 number.
+	
+		LLDeadmanTimer::time_type the_past(LLDeadmanTimer::getNow());
+		LLDeadmanTimer::time_type now(the_past + float_time_to_u64(20.0));
+		timer.start(the_past);
+		ensure_equals("WCM t7 - isExpired() returns true with 10.0 horizon time starting 20.0 in past",
+					  timer.isExpired(now,started, stopped, count, user_cpu, sys_cpu), true);
+		ensure_approximately_equals("WOCM t7 - starting before horizon still gives equal started / stopped", started, stopped, 8);
+	}
+}
+
+
+// isExpired() test - results are read-once.  Probes after first true are false.
+template<> template<>
+void deadmantimer_object_t::test<8>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(10.0, false);
+
+		// Would like to do subtraction on current time but can't because
+		// the implementation on Windows is zero-based.  We wrap around
+		// the backside resulting in a large U64 number.
+	
+		LLDeadmanTimer::time_type the_past(LLDeadmanTimer::getNow());
+		LLDeadmanTimer::time_type now(the_past + float_time_to_u64(20.0));
+		timer.start(the_past);
+		ensure_equals("WOCM t8 - isExpired() returns true with 10.0 horizon time starting 20.0 in past",
+					  timer.isExpired(now, started, stopped, count), true);
+		
+		started = 42.0;
+		stopped = 97.0;
+		count = U64L(8);
+		ensure_equals("WOCM t8 - second isExpired() returns false after true",
+					  timer.isExpired(now, started, stopped, count), false);
+		ensure_approximately_equals("WOCM t8 - 2nd isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WOCM t8 - 2nd isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WOCM t8 - 2nd isExpired() does not modify count", count, U64L(8));
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(10.0, true);
+
+		// Would like to do subtraction on current time but can't because
+		// the implementation on Windows is zero-based.  We wrap around
+		// the backside resulting in a large U64 number.
+	
+		LLDeadmanTimer::time_type the_past(LLDeadmanTimer::getNow());
+		LLDeadmanTimer::time_type now(the_past + float_time_to_u64(20.0));
+		timer.start(the_past);
+		ensure_equals("WCM t8 - isExpired() returns true with 10.0 horizon time starting 20.0 in past",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), true);
+		
+		started = 42.0;
+		stopped = 97.0;
+		count = U64L(8);
+		user_cpu = 29000;
+		sys_cpu = 57000;
+		ensure_equals("WCM t8 - second isExpired() returns false after true",
+					  timer.isExpired(now, started, stopped, count), false);
+		ensure_approximately_equals("WCM t8 - 2nd isExpired() does not modify started", started, F64(42.0), 2);
+		ensure_approximately_equals("WCM t8 - 2nd isExpired() does not modify stopped", stopped, F64(97.0), 2);
+		ensure_equals("WCM t8 - 2nd isExpired() does not modify count", count, U64L(8));
+		ensure_equals("WCM t8 - 2nd isExpired() does not modify user_cpu", user_cpu, U64L(29000));
+		ensure_equals("WCM t8 - 2nd isExpired() does not modify sys_cpu", sys_cpu, U64L(57000));
+	}
+}
+
+
+// ringBell() test - see that we can keep a timer from expiring
+template<> template<>
+void deadmantimer_object_t::test<9>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(5.0, false);
+
+		LLDeadmanTimer::time_type now(LLDeadmanTimer::getNow());
+		F64 real_start(u64_time_to_float(now));
+		timer.start(0);
+
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		ensure_equals("WOCM t9 - 5.0 horizon timer has not timed out after 10 1-second bell rings",
+					  timer.isExpired(now, started, stopped, count), false);
+		F64 last_good_ring(u64_time_to_float(now));
+
+		// Jump forward and expire
+		now += float_time_to_u64(10.0);
+		ensure_equals("WOCM t9 - 5.0 horizon timer expires on 10-second jump",
+					  timer.isExpired(now, started, stopped, count), true);
+		ensure_approximately_equals("WOCM t9 - started matches start() time", started, real_start, 4);
+		ensure_approximately_equals("WOCM t9 - stopped matches last ringBell() time", stopped, last_good_ring, 4);
+		ensure_equals("WOCM t9 - 10 good ringBell()s", count, U64L(10));
+		ensure_equals("WOCM t9 - single read only", timer.isExpired(now, started, stopped, count), false);
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+		LLDeadmanTimer timer(5.0, true);
+
+		LLDeadmanTimer::time_type now(LLDeadmanTimer::getNow());
+		F64 real_start(u64_time_to_float(now));
+		timer.start(0);
+
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		ensure_equals("WCM t9 - 5.0 horizon timer has not timed out after 10 1-second bell rings",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+		F64 last_good_ring(u64_time_to_float(now));
+
+		// Jump forward and expire
+		now += float_time_to_u64(10.0);
+		ensure_equals("WCM t9 - 5.0 horizon timer expires on 10-second jump",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), true);
+		ensure_approximately_equals("WCM t9 - started matches start() time", started, real_start, 4);
+		ensure_approximately_equals("WCM t9 - stopped matches last ringBell() time", stopped, last_good_ring, 4);
+		ensure_equals("WCM t9 - 10 good ringBell()s", count, U64L(10));
+		ensure_equals("WCM t9 - single read only", timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+	}
+}
+
+
+// restart after expiration test - verify that restarts behave well
+template<> template<>
+void deadmantimer_object_t::test<10>()
+{
+	{
+		// Without cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8));
+		LLDeadmanTimer timer(5.0, false);
+
+		LLDeadmanTimer::time_type now(LLDeadmanTimer::getNow());
+		F64 real_start(u64_time_to_float(now));
+		timer.start(0);
+
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		ensure_equals("WOCM t10 - 5.0 horizon timer has not timed out after 10 1-second bell rings",
+					  timer.isExpired(now, started, stopped, count), false);
+		F64 last_good_ring(u64_time_to_float(now));
+
+		// Jump forward and expire
+		now += float_time_to_u64(10.0);
+		ensure_equals("WOCM t10 - 5.0 horizon timer expires on 10-second jump",
+					  timer.isExpired(now, started, stopped, count), true);
+		ensure_approximately_equals("WOCM t10 - started matches start() time", started, real_start, 4);
+		ensure_approximately_equals("WOCM t10 - stopped matches last ringBell() time", stopped, last_good_ring, 4);
+		ensure_equals("WOCM t10 - 10 good ringBell()s", count, U64L(10));
+		ensure_equals("WOCM t10 - single read only", timer.isExpired(now, started, stopped, count), false);
+		
+		// Jump forward and restart
+		now += float_time_to_u64(1.0);
+		real_start = u64_time_to_float(now);
+		timer.start(now);
+		
+		// Run a modified bell ring sequence
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		ensure_equals("WOCM t10 - 5.0 horizon timer has not timed out after 8 1-second bell rings",
+					  timer.isExpired(now, started, stopped, count), false);
+		last_good_ring = u64_time_to_float(now);
+
+		// Jump forward and expire
+		now += float_time_to_u64(10.0);
+		ensure_equals("WOCM t10 - 5.0 horizon timer expires on 8-second jump",
+					  timer.isExpired(now, started, stopped, count), true);
+		ensure_approximately_equals("WOCM t10 - 2nd started matches start() time", started, real_start, 4);
+		ensure_approximately_equals("WOCM t10 - 2nd stopped matches last ringBell() time", stopped, last_good_ring, 4);
+		ensure_equals("WOCM t10 - 8 good ringBell()s", count, U64L(8));
+		ensure_equals("WOCM t10 - single read only - 2nd start",
+					  timer.isExpired(now, started, stopped, count), false);
+	}
+	{
+		// With cpu metrics
+		F64 started(42.0), stopped(97.0);
+		U64 count(U64L(8)), user_cpu(29000), sys_cpu(57000);
+
+		LLDeadmanTimer timer(5.0, true);
+
+		LLDeadmanTimer::time_type now(LLDeadmanTimer::getNow());
+		F64 real_start(u64_time_to_float(now));
+		timer.start(0);
+
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		ensure_equals("WCM t10 - 5.0 horizon timer has not timed out after 10 1-second bell rings",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+		F64 last_good_ring(u64_time_to_float(now));
+
+		// Jump forward and expire
+		now += float_time_to_u64(10.0);
+		ensure_equals("WCM t10 - 5.0 horizon timer expires on 10-second jump",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), true);
+		ensure_approximately_equals("WCM t10 - started matches start() time", started, real_start, 4);
+		ensure_approximately_equals("WCM t10 - stopped matches last ringBell() time", stopped, last_good_ring, 4);
+		ensure_equals("WCM t10 - 10 good ringBell()s", count, U64L(10));
+		ensure_equals("WCM t10 - single read only", timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+		
+		// Jump forward and restart
+		now += float_time_to_u64(1.0);
+		real_start = u64_time_to_float(now);
+		timer.start(now);
+		
+		// Run a modified bell ring sequence
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		now += float_time_to_u64(1.0);
+		timer.ringBell(now, 1);
+		ensure_equals("WCM t10 - 5.0 horizon timer has not timed out after 8 1-second bell rings",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+		last_good_ring = u64_time_to_float(now);
+
+		// Jump forward and expire
+		now += float_time_to_u64(10.0);
+		ensure_equals("WCM t10 - 5.0 horizon timer expires on 8-second jump",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), true);
+		ensure_approximately_equals("WCM t10 - 2nd started matches start() time", started, real_start, 4);
+		ensure_approximately_equals("WCM t10 - 2nd stopped matches last ringBell() time", stopped, last_good_ring, 4);
+		ensure_equals("WCM t10 - 8 good ringBell()s", count, U64L(8));
+		ensure_equals("WCM t10 - single read only - 2nd start",
+					  timer.isExpired(now, started, stopped, count, user_cpu, sys_cpu), false);
+	}
+}
+
+
+
+} // end namespace tut
diff --git a/indra/llcommon/tests/llprocinfo_test.cpp b/indra/llcommon/tests/llprocinfo_test.cpp
new file mode 100644
index 0000000000..12d5a695ee
--- /dev/null
+++ b/indra/llcommon/tests/llprocinfo_test.cpp
@@ -0,0 +1,91 @@
+/** 
+ * @file llprocinfo_test.cpp
+ * @brief Tests for the LLProcInfo class.
+ *
+ * $LicenseInfo:firstyear=2013&license=viewerlgpl$
+ * 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 "linden_common.h"
+
+#include "../llprocinfo.h"
+
+#include "../test/lltut.h"
+#include "../lltimer.h"
+
+
+static const LLProcInfo::time_type bad_user(289375U), bad_system(275U);
+
+
+namespace tut
+{
+
+struct procinfo_test
+{
+	procinfo_test()
+		{
+		}
+};
+
+typedef test_group<procinfo_test> procinfo_group_t;
+typedef procinfo_group_t::object procinfo_object_t;
+tut::procinfo_group_t procinfo_instance("LLProcInfo");
+
+
+// Basic invocation works
+template<> template<>
+void procinfo_object_t::test<1>()
+{
+	LLProcInfo::time_type user(bad_user), system(bad_system);
+
+	set_test_name("getCPUUsage() basic function");
+
+	LLProcInfo::getCPUUsage(user, system);
+	
+	ensure_not_equals("getCPUUsage() writes to its user argument", user, bad_user);
+	ensure_not_equals("getCPUUsage() writes to its system argument", system, bad_system);
+}
+
+
+// Time increases
+template<> template<>
+void procinfo_object_t::test<2>()
+{
+	LLProcInfo::time_type user(bad_user), system(bad_system);
+	LLProcInfo::time_type user2(bad_user), system2(bad_system);
+
+	set_test_name("getCPUUsage() increases over time");
+
+	LLProcInfo::getCPUUsage(user, system);
+	
+	for (int i(0); i < 100000; ++i)
+	{
+		ms_sleep(0);
+	}
+	
+	LLProcInfo::getCPUUsage(user2, system2);
+
+	ensure_equals("getCPUUsage() user value doesn't decrease over time", user2 >= user, true);
+	ensure_equals("getCPUUsage() system value doesn't decrease over time", system2 >= system, true);
+}
+
+
+} // end namespace tut