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# Conflicts:
# doc/contributions.txt
# indra/newview/llfloaterconversationpreview.cpp
# indra/newview/llinventorypanel.h
# indra/newview/llmeshrepository.h
# indra/newview/llvoicevivox.cpp
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# Conflicts:
# indra/cmake/DirectX.cmake
# indra/newview/llviewerparcelmedia.cpp
# indra/newview/viewer_manifest.py
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This reverts commit 31d9930a0ff7da5a6312a8f47037052cd2d06bdb.
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# Conflicts:
# autobuild.xml
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# Conflicts:
# autobuild.xml
# indra/newview/llimprocessing.cpp
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# Conflicts:
# indra/llcommon/llkeybind.cpp
# indra/llcommon/llkeybind.h
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User's viewer freezes right after setStartupState( STATE_LOGIN_CLEANUP ) and these places are primary suspects
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# Conflicts:
# indra/newview/CMakeLists.txt
# indra/newview/viewer_manifest.py
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# Conflicts:
# indra/llaudio/llaudioengine_fmodex.cpp
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# Conflicts:
# indra/llxml/llcontrolgroupreader.h
# indra/newview/llviewerkeyboard.cpp
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The observed crash was due to sharing a stateful global resource (the global
LLMessageSystem instance) between different tasks. Specifically, a coroutine
sets its mMessageReader one way, expecting that value to persist until it's
done with message parsing, but another coroutine sneaks in at a suspension
point and sets it differently.
Introduce LockMessageReader and LockMessageChecker classes, which must be
instantiated by a consumer of the resource. The constructor of each locks a
coroutine-aware mutex, so that for the lifetime of the lock object no other
coroutine can instantiate another.
Refactor the code so that LLMessageSystem::mMessageReader can only be modified
by LockMessageReader, not by direct assignment. mMessageReader is now an
instance of LLMessageReaderPointer, which supports dereferencing and
comparison but not assignment. Only LockMessageReader can change its value.
LockMessageReader addresses the use case in which the specific mMessageReader
value need only persist for the duration of a single method call. Add an
instance in LLMessageHandlerBridge::post().
LockMessageChecker is a subclass of LockMessageReader: both lock the same
mutex. LockMessageChecker addresses the use case in which the specific
mMessageReader value must persist across multiple method calls. Modify the
methods in question to require a LockMessageChecker instance. Provide
LockMessageChecker forwarding methods to facilitate calling the underlying
LLMessageSystem methods via the LockMessageChecker instance.
Add LockMessageChecker instances to LLAppViewer::idleNetwork(), a couple cases
in idle_startup() and LLMessageSystem::establishBidirectionalTrust().
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# Conflicts:
# indra/newview/llinventorybridge.cpp
# indra/newview/llinventorypanel.cpp
# indra/newview/lltexturectrl.cpp
# indra/newview/skins/default/xui/de/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/es/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/fr/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/it/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/ja/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/pt/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/ru/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/tr/floater_texture_ctrl.xml
# indra/newview/skins/default/xui/zh/floater_texture_ctrl.xml
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# Conflicts:
# indra/llmath/llquaternion.h
# indra/newview/lldrawpoolwater.cpp
# indra/newview/lljoystickbutton.cpp
# indra/newview/llvosky.cpp
# indra/newview/skins/default/textures/textures.xml
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Now, when the viewer decides it's appropriate to display release notes on the
login screen, wait for SLVersionChecker to post the release-notes URL before
opening the web floater.
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This changeset is meant to exemplify how to convert a "namespace" class whose
methods are static -- and whose data are module-static -- to an LLSingleton.
LLVersionInfo has no initClass() or cleanupClass() methods, but the general
idea is the same.
* Derive the class from LLSingleton<T>:
class LLSomeSingleton: public LLSingleton<LLSomeSingleton> { ... };
* Add LLSINGLETON(LLSomeSingleton); in the private section of the class. This
usage implies a separate LLSomeSingleton::LLSomeSingleton() definition, as
described in indra/llcommon/llsingleton.h.
* Move module-scope data in the .cpp file to non-static class members. Change
any sVariableName to mVariableName to avoid being outright misleading.
* Make static class methods non-static. Remove '//static' comments from method
definitions as needed.
* For LLVersionInfo specifically, the 'const std::string&' return type was
replaced with 'std::string'. Returning a reference to a static or a member,
const or otherwise, is an anti-pattern: the interface constrains the
implementation, prohibiting possibly later returning a temporary (an
expression).
* For LLVersionInfo specifically, 'const S32' return type was replaced with
simple 'S32'. 'const' is just noise in that usage.
* Simple member initialization (e.g. the original initializer expressions for
static variables) can be done with member{ value } initializers (no examples
here though).
* Delete initClass() method.
* LLSingleton's forté is of course lazy initialization. It might work to
simply delete any calls to initClass(). But if there are side effects that
must happen at that moment, replace LLSomeSingleton::initClass() with
(void)LLSomeSingleton::instance();
* Most initClass() initialization can be done in the constructor, as would
normally be the case.
* Initialization that might cause a circular LLSingleton reference should be
moved to initSingleton(). Override 'void initSingleton();' should be private.
* For LLVersionInfo specifically, certain initialization that used to be
lazily performed was made unconditional, due to its low cost.
* For LLVersionInfo specifically, certain initialization involved calling
methods that have become non-static. This was moved to initSingleton()
because, in a constructor body, 'this' does not yet point to the enclosing
class.
* Delete cleanupClass() method.
* There is already a generic LLSingletonBase::deleteAll() call in
LLAppViewer::cleanup(). It might work to let this new LLSingleton be cleaned
up with all the rest. But if there are side effects that must happen at that
moment, replace LLSomeSingleton::cleanupClass() with
LLSomeSingleton::deleteSingleton(). That said, much of the benefit of
converting to LLSingleton is deleteAll()'s guarantee that cross-LLSingleton
dependencies will be properly honored: we're trying to migrate the code base
away from the present fragile manual cleanup sequence.
* Most cleanupClass() cleanup can be done in the destructor, as would normally
be the case.
* Cleanup that might throw an exception should be moved to cleanupSingleton().
Override 'void cleanupSingleton();' should be private.
* Within LLSomeSingleton methods, remove any existing
LLSomeSingleton::methodName() qualification: simple methodName() is better.
* In the rest of the code base, convert most LLSomeSingleton::methodName()
references to LLSomeSingleton::instance().methodName(). (Prefer instance() to
getInstance() because a reference does not admit the possibility of NULL.)
* Of course, LLSomeSingleton::ENUM_VALUE can remain unchanged.
In general, for many successive references to an LLSingleton instance, it
can be useful to capture the instance() as in:
auto& versionInfo{LLVersionInfo::instance()};
// ... versionInfo.getVersion() ...
We did not do that here only to simplify the code review.
The STRINGIZE(expression) macro encapsulates:
std::ostringstream out;
out << expression;
return out.str();
We used that in a couple places.
For LLVersionInfo specifically, lllogininstance_test.cpp used to dummy out a
couple specific static methods. It's harder to dummy out
LLSingleton::instance() references, so we add the real class to that test.
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