Hello,
I cannot get out of a threading issue while using osgTerrain (OSG v1.2)
in a separate worker thread.
Context:
- main thread rendering an OSG scene graph
- 2nd thread running osgTerrain in batch mode on a separate graphic context.
- everything runs fine if batch goes to completion.
However, if I cancel the worker thread (e.g.: user interaction or
application exiting before completion), I get an uncatchable exception
with following call stack:
#0 0x00002aaaad8d811d in raise () from /lib/libc.so.6
#1 0x00002aaaad8d984e in abort () from /lib/libc.so.6
#2 0x00002aaaad30dcc1 in unwind_cleanup () from /lib/libpthread.so.0
#3 0x00002aaaad4a72bd in std::ostream::flush () from
/usr/lib/libstdc++.so.6
#4 0x00002aaaabb9d724 in osgUtil::Simplifier::simplify () from
/home/tonio/local/lib64/libosgUtil.so
#5 0x00002aaaab718d19 in
osgTerrain::DataSet::DestinationTile::createPolygonal () from
/home/tonio/local/lib64/libosgTerrain.so
#6 0x00002aaaab71e58b in
osgTerrain::DataSet::CompositeDestination::createPagedLODScene () from
/home/tonio/local/lib64/libosgTerrain.so
#7 0x00002aaaab71ee8f in
osgTerrain::DataSet::CompositeDestination::createSubTileScene () from
/home/tonio/local/lib64/libosgTerrain.so
#8 0x00002aaaab71f02f in osgTerrain::DataSet::_writeRow () from
/home/tonio/local/lib64/libosgTerrain.so
#9 0x00002aaaab721cd7 in osgTerrain::DataSet::_buildDestination () from
/home/tonio/local/lib64/libosgTerrain.so
#10 0x00002aaaaac1802e in osgTerrain::DataSet::writeDestination
(this=0x1056dd0) at DataSet:1203
#11 0x00002aaaaac1631c in pti::Map::processCore (this=0x1055bb0,
state_=0x82ad80) at ../Map.cpp:289
#12 0x00002aaaaac194b4 in pti::ThreadProcessor::run (this=0x7f85b0) at
../MapProcessor.cpp:180
#13 0x00002aaaab33a370 in OpenThreads::ThreadPrivateActions::StartThread
() from /home/tonio/local/lib/libOpenThreads.so
I cannot get the ostream to flush properly or to exit as is.
I tried to delete the osgTerrain::DataSet instance in thread's
cancelCleanup but the exception is thrown before.
Any idea ?
Thread cancel is kind of difficult to handle. For example, I tried to
perform a join after the cancel but this never returns... I use a thread
condition to wait before exiting the main thread but this also not
always complete on Mac OS X (at least).
Thanks in advance for any help,
Antoine
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