This patch refactors the nsThread event queue to clean it up and to make it easier to restructure. The fundamental concepts are as follows:
Each nsThread will have a pointer to a refcounted SynchronizedEventQueue. A SynchronizedEQ takes care of doing the locking and condition variable work when posting and popping events. For the actual storage of events, it delegates to an AbstractEventQueue data structure. It keeps a UniquePtr to the AbstractEventQueue that it uses for storage.
Both SynchronizedEQ and AbstractEventQueue are abstract classes. There is only one concrete implementation of SynchronizedEQ in this patch, which is called ThreadEventQueue. ThreadEventQueue uses locks and condition variables to post and pop events the same way nsThread does. It also encapsulates the functionality that DOM workers need to implement their special event loops (PushEventQueue and PopEventQueue). In later Quantum DOM work, I plan to have another SynchronizedEQ implementation for the main thread, called SchedulerEventQueue. It will have special code for the cooperatively scheduling threads in Quantum DOM.
There are two concrete implementations of AbstractEventQueue in this patch: EventQueue and PrioritizedEventQueue. EventQueue replaces the old nsEventQueue. The other AbstractEventQueue implementation is PrioritizedEventQueue, which uses multiple queues for different event priorities.
The final major piece here is ThreadEventTarget, which splits some of the code for posting events out of nsThread. Eventually, my plan is for multiple cooperatively scheduled nsThreads to be able to share a ThreadEventTarget. In this patch, though, each nsThread has its own ThreadEventTarget. The class's purpose is just to collect some related code together.
One final note: I tried to avoid virtual dispatch overhead as much as possible. Calls to SynchronizedEQ methods do use virtual dispatch, since I plan to use different implementations for different threads with Quantum DOM. But all the calls to EventQueue methods should be non-virtual. Although the methods are declared virtual, all the classes used are final and the concrete classes involved should all be known through templatization.
MozReview-Commit-ID: 9Evtr9oIJvx
We have a minimum requirement of VS 2015 for Windows builds, which supports
the z length modifier for format specifiers. So we don't need SizePrintfMacros.h
any more, and can just use %zu and friends directly everywhere.
MozReview-Commit-ID: 6s78RvPFMzv
--HG--
extra : rebase_source : 009ea39eb4dac1c927aa03e4f97d8ab673de8a0e
dom/workers/ScriptLoader.cpp:246:3 [-Wunused-member-function] unused member function 'ReadyToExecute'
dom/workers/ServiceWorkerScriptCache.cpp:200:19 [-Wunused-member-function] unused member function 'URL'
dom/workers/WorkerPrivate.cpp:1553:3 [-Wunused-member-function] unused member function 'DummyRunnable'
MozReview-Commit-ID: DLjD10iZJJV
--HG--
extra : source : db094b81fb77993c48e2884ffef700e34302c03e
extra : intermediate-source : fd1c6bd2b6882efb9e6ac3aeabe18968826297e4
extra : histedit_source : 8faac0927d4d97062fd74395dc2980cde57785b9
For the Quatum DOM project, it's better to work in terms of event targets than
threads. This patch converts DOM code to operate on event targets rather than
threads, when possible.
MozReview-Commit-ID: 5FgvpKadUA2
These prefs have been added close to two years ago:
dom.url.encode_decode_hash and dom.url.getters_decode_hash
The main reason for their existence was in case we encounter any web-compat issues. At this point the extra code is mostly useless, and flipping the pref may lead to crashes.
MozReview-Commit-ID: LhAHkYmv0TR
--HG--
extra : rebase_source : 8f2d50d5633496cf165b3925d952bb6475bce3e0
Bill McCloskey
Masatoshi Kimura
Ben Kelly
Carsten "Tomcat" Book
Andrea Marchesini
Bevis Tseng
Kartikaya Gupta
Ryan VanderMeulen
Sylvestre Ledru
Boris Zbarsky
Chris Peterson
Jon Coppeard
Thomas Nguyen
Paul Bignier
Valentin Gosu
Tom Tromey