The previous implementation went to some effort to crash if anyone attempted
to create or destroy an LLInstanceTracker subclass instance during traversal.
That restriction is manageable within a single thread, but becomes unworkable
if it's possible that a given subclass might be used on more than one thread.
Remove LLInstanceTracker::instance_iter, beginInstances(), endInstances(),
also key_iter, beginKeys() and endKeys(). Instead, introduce key_snapshot()
and instance_snapshot(), the only means of iterating over LLInstanceTracker
instances. (These are intended to resemble functions, but in fact the current
implementation simply presents the classes.) Iterating over a captured
snapshot defends against container modifications during traversal. The term
'snapshot' reminds the coder that a new instance created during traversal will
not be considered. To defend against instance deletion during traversal, a
snapshot stores std::weak_ptrs which it lazily dereferences, skipping on the
fly any that have expired.
Dereferencing instance_snapshot::iterator gets you a reference rather than a
pointer. Because some use cases want to delete all existing instances, add an
instance_snapshot::deleteAll() method that extracts the pointer. Those cases
used to require explicitly copying instance pointers into a separate
container; instance_snapshot() now takes care of that. It remains the caller's
responsibility to ensure that all instances of that LLInstanceTracker subclass
were allocated on the heap.
Replace unkeyed static LLInstanceTracker::getInstance(T*) -- which returned
nullptr if that instance had been destroyed -- with new getWeak() method
returning std::weak_ptr<T>. Caller must detect expiration of that weak_ptr.
Adjust tests accordingly.
Use of std::weak_ptr to detect expired instances requires engaging
std::shared_ptr in the constructor. We now store shared_ptrs in the static
containers (std::map for keyed, std::set for unkeyed).
Make LLInstanceTrackerBase a template parameterized on the type of the static
data it manages. For that reason, hoist static data class declarations out of
the class definitions to an LLInstanceTrackerStuff namespace.
Remove the static atomic sIterationNestDepth and its methods incrementDepth(),
decrementDepth() and getDepth(), since they were used only to forbid creation
and destruction during traversal.
Add a std::mutex to static data. Introduce an internal LockStatic class that
locks the mutex while providing a pointer to static data, making that the only
way to access the static data.
The LLINSTANCETRACKER_DTOR_NOEXCEPT macro goes away because we no longer
expect ~LLInstanceTracker() to throw an exception in test programs.
That affects LLTrace::StatBase as well as LLInstanceTracker itself.
Adapt consumers to the new LLInstanceTracker API.
forced unit conversion code to inline
unit conversion now no longer converts all the way to base and back, but tries
to find equivalent units as early as possible
fixed another llinfos instance
scene monitor now outputs n/a for invalid samples
continued conversion to units system
made units perform type promotion correctly and preserve type in arithmetic
e.g. can now do LLVector3 in units
added typedefs for remaining common unit types, including implicits
various fixes to lltrace
start() on started recording no longer resets
fixed various instances of unit forgetfullness in lltrace
recording split now has gapless timing
scene monitor now guarantees min sample time
renamed a bunch of stats
added names to debug thread view on windows
added getAs and setAs to LLUnit to make it clearer how you specify units
removed accidental 0-based indexing of periodicRecording history...
should now be consistently 1-based, with 0 accessing current active recording
removed per frame timer updates of all historical timer bars in fast timer display
added missing assignment operator to recordings
changed Units macros and argument order to make it more clear
optimized units for integer types
fixed merging of periodicrecordings...should eliminate duplicate entries in sceneloadmonitor history
fixed mem stat tracking...now properly tracks memory footprint with floating point
precision
cleaned up macros for unit declaration
renamed units to SI standard for 1024 multiples (kibibytes, etc)
fixed units output for scene monitor dump
removed unnecessary templates from accumulator types...now always
track data in double precision floating point, using templated accessors to
convert to and from arbitrary types
fixed multithreading lltrace causing values to be interpolated towards 0
added Radians unit
improved sceneloadmonitor restart heuristic to use accumulated camera motion
fixed copy construction behavior of Recordings to not zero out data
split measurement into event and sample, with sample representing
a continuous function
removed extra dereference for copy on write pointer
moved copyonwrite mechanism to RecordingBuffers from individual buffer
fixed logic that was leaving scene unfrozen when camera moved during metrics gathering
fixed copy construction of Recorders, eliminated most zero-length frames
fixed reset behavior of periodic recordings and extendable recordings to clear entire
history
removed busy-loop recording of stats from worker threads...stats reported only when work is done
renamed LLView::handleVisibilityChange to onVisibilityChange to reflect
cleaned up scene monitor stats recording, now all trace stats dumped to csv
also fixed extendablerecording, periodicrecording, etc. to properly implement start/stop/etc
Andrey Kleshchev