libreoffice-online/kit
Michael Meeks f8a5edb995 Transfer LOK callback processing into our main thread if necessary.
While we are processing data in the poll handler, we can have
another helpful thread from the core sending things to us:

loolforkit(Socket::assertCorrectThread(char const*, int))
loolforkit(WebSocketHandler::sendFrame(std::shared_ptr<StreamSocket> const&, char const*, unsigned long, unsigned char, bool) const)
loolforkit(WebSocketHandler::sendMessage(char const*, unsigned long, WSOpCode, bool) const)
loolforkit(Document::postMessage(char const*, int, WSOpCode) const)
loolforkit(Document::sendFrame(char const*, int, WSOpCode))
loolforkit(ChildSession::sendTextFrame(char const*, int))
loolforkit(ChildSession::loKitCallback(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&))
loolforkit(Document::GlobalCallback(int, char const*, void*))
/core/instdir/program/libsofficeapp.so()
/core/instdir/program/../program/libfwklo.so()
/core/instdir/program/libscfiltlo.so()
/core/instdir/program/libexpwraplo.so()
/core/instdir/program/libooxlo.so(oox::core::FastParser::parseStream(com::sun::xml::sax::InputSource const&, bool))
/core/instdir/program/libooxlo.so(oox::core::FastParser::parseStream(com::sun::uno::Reference<com::sun::io::XInputStream> const&, rtl::OUString const&))
/core/instdir/program/libooxlo.so(oox::core::XmlFilterBase::importFragment(rtl::Reference<oox::core::FragmentHandler> const&, oox::core::FastParser&))
/core/instdir/program/libscfiltlo.so()
/core/instdir/program/libcomphelper.so(comphelper::ThreadTask::exec())
/core/instdir/program/libcomphelper.so()
/core/instdir/program/libuno_salhelpergcc3.so.3(salhelper::Thread::run())
/core/instdir/program/libuno_salhelpergcc3.so.3()
/core/instdir/program/libuno_sal.so.3()
/lib/x86_64-linux-gnu/libpthread.so.0()
/lib/x86_64-linux-gnu/libc.so.6(clone)

This is most likely from eg. threaded parsing of various file formats,
or progress messages while loading / saving, sent while the SolarMutex
is locked.

We assume that:
  + there will only ever be one thread running inside kitPoll
    this is enforced by vcl/headless.
  + and so, we can safely mutate SocketPoll and Socket buffer
    state from this thread.
  + there are only two entry points for callbacks from threads
    in core - which are both instrumented, and if necessary
    their work is shifted to this thread.

Memory corruptions matching the above trace, suggesting that
multiple writes have collided between kitPoll and an event
callback have been seen in the wild.

Change-Id: I5b084cbfec1ea326b6e17c9e5590a8c8e35b3854
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>
2021-06-14 09:31:26 +01:00
..
ChildSession.cpp Introduce a generic TraceEvent class and instant events here, too 2021-06-02 09:04:21 +03:00
ChildSession.hpp wsd: download templates by wsd 2021-02-15 09:41:17 -05:00
Delta.hpp
DummyLibreOfficeKit.cpp
DummyLibreOfficeKit.hpp
ForKit.cpp Use a loolwsd.xml setting instead of --enable-trace-event-logging 2021-05-19 13:33:26 +03:00
Kit.cpp Transfer LOK callback processing into our main thread if necessary. 2021-06-14 09:31:26 +01:00
Kit.hpp Use a loolwsd.xml setting instead of --enable-trace-event-logging 2021-05-19 13:33:26 +03:00
KitHelper.hpp impress: hide regular slides in master view 2021-04-01 14:02:46 +02:00
SetupKitEnvironment.hpp Don't enable profiling yet. 2021-05-06 20:31:55 +03:00
TestStubs.cpp
Watermark.hpp fix: watermark not present in fully transparent tiles 2021-06-14 13:33:13 +05:30