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Noel Grandin 0f625fb713 tsan: fix data race in BufferedDecompositionFlusher

WARNING: ThreadSanitizer: data race (pid=271122)
  Write of size 8 at 0x7244000becc0 by main thread (mutexes: write M0):
    #0 drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const /home/noel/libo-tsan/drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:90 (libdrawinglayercorelo.so+0xb986)
    #1 drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/baseprocessor2d.cxx:43 (libdrawinglayerlo.so+0x1284cf)
    #2 drawinglayer::processor2d::CairoPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/cairopixelprocessor2d.cxx:4230 (libdrawinglayerlo.so+0x7a370)
    #3 drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/baseprocessor2d.cxx:67 (libdrawinglayerlo.so+0x1286f1)
    #4 drawinglayer::processor2d::CairoPixelProcessor2D::processMaskPrimitive2D(drawinglayer::primitive2d::MaskPrimitive2D const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/cairopixelprocessor2d.cxx:1919 (libdrawinglayerlo.so+0x6fbd9)
    #5 drawinglayer::processor2d::CairoPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/cairopixelprocessor2d.cxx:4103 (libdrawinglayerlo.so+0x7a33c)
    #6 drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/baseprocessor2d.cxx:67 (libdrawinglayerlo.so+0x1285f1)
    #7 drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/baseprocessor2d.cxx:54 (libdrawinglayerlo.so+0x1285f1)
    #8 drawinglayer::primitive2d::GroupPrimitive2D::getChildren(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&) const /home/noel/libo-tsan/include/drawinglayer/primitive2d/groupprimitive2d.hxx:76 (libdrawinglayercorelo.so+0x1c51b)
    #9 drawinglayer::primitive2d::GroupPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const /home/noel/libo-tsan/drawinglayer/source/primitive2d/groupprimitive2d.cxx:53 (libdrawinglayercorelo.so+0x1c51b)
    #10 drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) /home/noel/libo-tsan/drawinglayer/source/processor2d/baseprocessor2d.cxx:43 (libdrawinglayerlo.so+0x1284cf)

  Previous read of size 8 at 0x7244000becc0 by thread T299 (mutexes: write M1):
    #0 std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > >::time_since_epoch() const /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/bits/chrono.h:950 (libdrawinglayercorelo.so+0xcd6f)
    #1 std::common_type<std::chrono::duration<long, std::ratio<1l, 1000000000l> >, std::chrono::duration<long, std::ratio<1l, 1000000000l> > >::type std::chrono::operator-<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> >, std::chrono::duration<long, std::ratio<1l, 1000000000l> > >(std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > const&, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > const&) /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/bits/chrono.h:1143 (libdrawinglayercorelo.so+0xcd6f)
    #2 drawinglayer::primitive2d::BufferedDecompositionFlusher::run() /home/noel/libo-tsan/drawinglayer/source/primitive2d/BufferedDecompositionFlusher.cxx:133 (libdrawinglayercorelo.so+0xcd6f)
    #3 threadFunc /home/noel/libo-tsan/include/osl/thread.hxx:189 (libdrawinglayercorelo.so+0xe0ee)
    #4 osl_thread_start_Impl(void*) /home/noel/libo-tsan/sal/osl/unx/thread.cxx:237 (libuno_sal.so.3+0x6b419)

Change-Id: Ie7afe0501d0d562117fc4418a3fe24853397aefe
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/187238
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>