Allow embedders to specify a render task runner description. #13124

chinmaygarde · 2019-10-14T22:27:54Z

Embedders may use this to specify a thread whose event loop is managed by them
instead of the engine. In addition, specifying the same task runner for both
the platform and render task runners allows embedders to effectively perform
GPU rendering operations on the platform thread.

To affect this change, the following non breaking changes to the API have been
made:

The FlutterCustomTaskRunners struct now has a new field render_task_runner
for the specification of a custom render task runner.
The FlutterTaskRunnerDescription has a new field identifier. Embedders
must supply a unique identifier for each task runner they specify. In
addition, when describing multiple task runners that run their tasks on the
same thread, their identifiers must match.
The embedder may need to process tasks during FlutterEngineRun and
FlutterEngineShutdown. However, the embedder doesn't have the Flutter engine
handle before FlutterEngineRun and is supposed to relinquish handle right
before FlutterEngineShutdown. Since the embedder needs the Flutter engine
handle to service tasks on other threads while these calls are underway,
there exist opportunities for deadlock. To work around this scenario, three
new calls have been added that allow more deliberate management of the Flutter
engine instance.
- FlutterEngineRun can be replaced with FlutterEngineInitialize and
  FlutterEngineRunInitialized. The embedder can obtain a handle to the
  engine after the first call but the engine will not post any tasks to custom
  task runners specified by the embedder till the
  FlutterEngineRunInitialized call. Embedders can guard the Flutter engine
  handle behind a mutex for safe task runner interop.
- FlutterEngineShutdown can be preceded by the FlutterEngineDeinitialize
  call. After this call the Flutter engine will no longer post tasks onto
  embedder managed task runners. It is still embedder responsibility to
  collect the Flutter engine handle via FlutterEngineShutdown.
To maintain backwards compatibility with the old APIs, FlutterEngineRun is
now just a convenience for FlutterEngineInitialize and
FlutterEngineRunInitilaized. FlutterEngineShutdown now implicitly calls
FlutterEngineDeinitialize as well. This allows existing users who don't care
are custom task runner interop to keep using the old APIs.
Adds complete test coverage for both old and new paths.

Fixes flutter/flutter#42460
Prerequisite for flutter/flutter#17579

jason-simmons · 2019-10-14T22:52:40Z

shell/platform/embedder/embedder.h

+///             cases where the embedder specifies custom task runners via
+///             `FlutterProjectArgs::custom_task_runners`. In such cases, the
+///             engine may need the embedder to post tasks back to it before
+///             `FluterEngineRun` has returned. Embedders can only post tasks to


typo: "Flutter"

jason-simmons · 2019-10-14T22:56:10Z

shell/platform/embedder/embedder.h

                                         engine_out);

+//------------------------------------------------------------------------------
+/// @brief      Shuts down a Flutter engine Tnstance. the engine handle is no


typo: "instance"

jason-simmons · 2019-10-14T23:00:43Z

shell/platform/embedder/embedder.h

+///             custom task runners supplied by the embedder are expected to
+///             start servicing tasks.
+///
+/// @param[in]  engine  A initialized engine instance that has not previously


jason-simmons · 2019-10-14T23:01:35Z

shell/platform/embedder/embedder.h

+/// @param[in]  engine  A initialized engine instance that has not previously
+///                     been run.
+///
+/// @return     The result of the call to run the initialized the Flutter


remove "the initialized"?

jason-simmons · 2019-10-14T23:17:31Z

shell/platform/embedder/embedder_thread_host.cc

+  uint64_t engine_thread_host_mask =
+      ThreadHost::Type::UI | ThreadHost::Type::IO;
+
+  auto optional_platform_task_runner = CreateEmbedderTaskRunner(


imho it would be clearer if CreateEmbedderTaskRunner returned a bool indicating success and used a RefPtr<EmbedderTaskRunner>* output parameter for the runner.

Done. But instead of the out parameter, I used a pair instead.

jason-simmons · 2019-10-14T23:19:53Z

shell/platform/embedder/embedder_thread_host.cc

-    return nullptr;
+  // If both the platform task runner and the GPU task runner are specified and
+  // have the same identifier, store only one.
+  if (optional_platform_task_runner.has_value() &&


This should be value() - at this point optional_platform_task_runner is known to contain a value, but the value might be null.

(see the comment above - removing usage of std::optional here would make this clearer)

Addressed using the pair.

chinmaygarde

Addressed other concerns. Will work on making CreateEmbedderTaskRunner clearer.

chinmaygarde · 2019-10-14T23:41:03Z

shell/platform/embedder/embedder.h

+///             cases where the embedder specifies custom task runners via
+///             `FlutterProjectArgs::custom_task_runners`. In such cases, the
+///             engine may need the embedder to post tasks back to it before
+///             `FluterEngineRun` has returned. Embedders can only post tasks to


chinmaygarde · 2019-10-14T23:41:16Z

shell/platform/embedder/embedder.h

                                         engine_out);

+//------------------------------------------------------------------------------
+/// @brief      Shuts down a Flutter engine Tnstance. the engine handle is no


chinmaygarde · 2019-10-14T23:41:27Z

shell/platform/embedder/embedder.h

+///             custom task runners supplied by the embedder are expected to
+///             start servicing tasks.
+///
+/// @param[in]  engine  A initialized engine instance that has not previously


chinmaygarde · 2019-10-14T23:41:56Z

shell/platform/embedder/embedder.h

+/// @param[in]  engine  A initialized engine instance that has not previously
+///                     been run.
+///
+/// @return     The result of the call to run the initialized the Flutter


chinmaygarde · 2019-10-15T00:40:36Z

I tried the suggestion to make CreateEmbedderTaskRunner easier to understand but I believe the current model is still clearer because:

The method needs to handle the following states:

The embedder does not specify any task runner.
The embedder specifies a task runner but messes up by not specifying all required fields.
The embedder correctly specifies a task runner.

In case of 1 and 3, engine initialization must continue. In case of 2, engine intialization must be terminated with kInvalid arguments.

In case of 1, an fml::TaskRunner fallback must be selected. In case of 3, an fml::EmbedderTaskRunner (a subclass of fml::TaskRunner) must be used. This is because the embedder task runner must be added to the task runner dispatch table in the embedder thread host.

Either approach has to handle all these cases and I couldn't find the out parameter approach any clearer. That a null ref ptr signifies a fallback to fml::TaskRunner defaults has already been specified in the docstring.

One other idea was passing a fml::TaskRunner as a default to the method. But this wont work because in case of the default return, I can't downcast to an EmbedderTaskRunner (to do the disambiguation via the identifier).

For these reasons, I'd rather keep the behavior of CreateEmbedderTaskRunner as-is.

Embedders may use this to specify a thread whose event loop is managed by them instead of the engine. In addition, specifying the same task runner for both the platform and render task runners allows embedders to effectively perform GPU rendering operations on the platform thread. To affect this change, the following non breaking changes to the API have been made: * The `FlutterCustomTaskRunners` struct now has a new field `render_task_runner` for the specification of a custom render task runner. * The `FlutterTaskRunnerDescription` has a new field `identifier`. Embedders must supply a unique identifier for each task runner they specify. In addition, when describing multiple task runners that run their tasks on the same thread, their identifiers must match. * The embedder may need to process tasks during `FlutterEngineRun` and `FlutterEngineShutdown`. However, the embedder doesn't have the Flutter engine handle before `FlutterEngineRun` and is supposed to relinquish handle right before `FlutterEngineShutdown`. Since the embedder needs the Flutter engine handle to service tasks on other threads while these calls are underway, there exist opportunities for deadlock. To work around this scenario, three new calls have been added that allow more deliberate management of the Flutter engine instance. * `FlutterEngineRun` can be replaced with `FlutterEngineInitialize` and `FlutterEngineRunInitialized`. The embedder can obtain a handle to the engine after the first call but the engine will not post any tasks to custom task runners specified by the embedder till the `FlutterEngineRunInitialized` call. Embedders can guard the Flutter engine handle behind a mutex for safe task runner interop. * `FlutterEngineShutdown` can be preceded by the `FlutterEngineDeinitialize` call. After this call the Flutter engine will no longer post tasks onto embedder managed task runners. It is still embedder responsibility to collect the Flutter engine handle via `FlutterEngineShutdown`. * To maintain backwards compatibility with the old APIs, `FlutterEngineRun` is now just a convenience for `FlutterEngineInitialize` and `FlutterEngineRunInitilaized`. `FlutterEngineShutdown` now implicitly calls `FlutterEngineDeinitialize` as well. This allows existing users who don't care are custom task runner interop to keep using the old APIs. * Adds complete test coverage for both old and new paths. Fixes flutter/flutter#42460 Prerequisite for flutter/flutter#17579

shell/platform/embedder/embedder.h

franciscojma86 · 2019-10-15T01:00:37Z

shell/platform/embedder/embedder.h

                                         engine_out);

+//------------------------------------------------------------------------------
+/// @brief      Shuts down a Flutter engine instance. the engine handle is no


franciscojma86 · 2019-10-15T01:17:47Z

shell/platform/embedder/embedder_engine.cc

+                         shell_args_->on_create_platform_view,
+                         shell_args_->on_create_rasterizer);
+
+  // Reset the args no matter what. We are never going to use them to initialize


franciscojma86 · 2019-10-15T01:22:41Z

shell/platform/embedder/embedder_task_runner.h


  ~EmbedderTaskRunner() override;

+  size_t GetEmbedderIdentifier() const;


Might be worth documenting the class and methods

Done. Documented all methods and the class.

franciscojma86 · 2019-10-15T01:30:45Z

shell/platform/embedder/embedder_thread_host.cc

-  const auto platform_task_runner = CreateEmbedderTaskRunner(
+  // The UI and IO threads are always created by the engine and the embedder has
+  // no opportunity to specify task runners for the same.
+  // TODO(chinmaygarde): If we ever decide to expose more task runners to engine


Consider using github issue ids for TODOs instead of personal IDs, since they might be confusing for future readers (is the person going to implement? are they the person to ask questions? is this in their current priorities? etc).

In this case I don't see much value in using either, seems like it could just be part of the comment (but still avoid "we" ) :)

franciscojma86 · 2019-10-15T01:31:20Z

shell/platform/embedder/embedder_thread_host.cc

+  if (!optional_platform_task_runner.has_value() ||
+      !optional_render_task_runner.has_value()) {
+    // User error while supplying a custom task runner. Return an invalid thread
+    // host. This will abort engine initialization. We don't want to fallback to


avoid "we" here and below as well

franciscojma86 · 2019-10-15T01:34:33Z

shell/platform/embedder/tests/embedder_unittests.cc

+///
+TEST_F(EmbedderTest,
+       CanCreateEmbedderWithCustomRenderTaskRunnerTheSameAsPlatformTaskRunner) {
+  // We need to create a new thread to act as the platform thread because we


nit: avoid "we" and remove extra line below?

…lutter/engine#13124)

git@github.com:flutter/engine.git/compare/540fc977bb6b...5e6c005 git log 540fc97..5e6c005 --no-merges --oneline 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 083a75d6762c..59e72b71b5cf (1 commits) (flutter/engine#13169) 2019-10-16 a-siva@users.noreply.github.com Roll src/third_party/dart 4131d3d7c4...41b65b27c2 (28 commits) (flutter/engine#13163) 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 7274850f96f2..083a75d6762c (1 commits) (flutter/engine#13168) 2019-10-16 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 5I4Iw... to oTVah... (flutter/engine#13167) 2019-10-16 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from qpzUe... to KVDL4... (flutter/engine#13166) 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 634d15032d37..7274850f96f2 (3 commits) (flutter/engine#13165) 2019-10-16 yjbanov@google.com Move surface-based SceneBuilder implementation under surface/ (flutter/engine#13159) 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia ba8752f37dab..634d15032d37 (2 commits) (flutter/engine#13164) 2019-10-16 chinmaygarde@gmail.com Revert "Issue 13238: on iOS, force an orientation change when the current orientation is not allowed" (flutter/engine#13160) 2019-10-15 chinmaygarde@google.com Roll buildroot to pull in static thread safety analysis options. (flutter/engine#13155) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia fb6a1abe4567..ba8752f37dab (8 commits) (flutter/engine#13156) 2019-10-15 chinmaygarde@google.com Make the Dart isolate constructor private. (flutter/engine#13153) 2019-10-15 iska.kaushik@gmail.com Revert "Upgrades the ICU version to 64.2 (#13123)" (flutter/engine#13146) 2019-10-15 1541038+josh-ksr@users.noreply.github.com Issue 13238: on iOS, force an orientation change when the current orientation is not allowed (flutter/engine#12295) 2019-10-15 chinmaygarde@google.com Allow embedders to specify a render task runner description. (flutter/engine#13124) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from Jv4XM... to 5I4Iw... (flutter/engine#13150) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from i5xD1... to qpzUe... (flutter/engine#13149) 2019-10-15 bkonyi@google.com Roll src/third_party/dart fc933312f7..4131d3d7c4 (3 commits) 2019-10-15 chinmaygarde@google.com Document //flutter/runtime/dart_vm (flutter/engine#13144) 2019-10-15 iska.kaushik@gmail.com Revert "Enable/tweak web sdk source maps (#13141)" (flutter/engine#13148) 2019-10-15 jason-simmons@users.noreply.github.com Merge the Fuchsia frontend_server build script into the new flutter_frontend_server target (flutter/engine#13145) 2019-10-15 iska.kaushik@gmail.com Add `flutter_tester` binary to the CIPD package (flutter/engine#13143) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia f22c57ddcc8c..fb6a1abe4567 (2 commits) (flutter/engine#13142) 2019-10-15 vsm@google.com Enable/tweak web sdk source maps (flutter/engine#13141) 2019-10-15 filmil@gmail.com Upgrades the ICU version to 64.2 (flutter/engine#13123) 2019-10-15 rmacnak@google.com [frontend_server] Include bytecode generation in the training run. (flutter/engine#13126) 2019-10-15 wvvwwvw@gmail.com Support empty strings and vectors in standard codec (flutter/engine#12974) 2019-10-15 bkonyi@google.com Roll src/third_party/dart 50f7ae9c5d..fc933312f7 (2 commits) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia 55f9cba6e2e7..f22c57ddcc8c (1 commits) (flutter/engine#13136) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from xRgq0... to Jv4XM... (flutter/engine#13135) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from Lk7iT... to i5xD1... (flutter/engine#13134) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia 858cf233ef71..55f9cba6e2e7 (3 commits) (flutter/engine#13133) 2019-10-15 bkonyi@google.com Roll src/third_party/dart 70a7ef3f58..50f7ae9c5d (18 commits) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC franciscojma@google.com on the revert to ensure that a human is aware of the problem. To report a problem with the AutoRoller itself, please file a bug: https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug Documentation for the AutoRoller is here: ...

git@github.com:flutter/engine.git/compare/540fc977bb6b...5e6c005 git log 540fc97..5e6c005 --no-merges --oneline 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 083a75d6762c..59e72b71b5cf (1 commits) (flutter/engine#13169) 2019-10-16 a-siva@users.noreply.github.com Roll src/third_party/dart 4131d3d7c4...41b65b27c2 (28 commits) (flutter/engine#13163) 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 7274850f96f2..083a75d6762c (1 commits) (flutter/engine#13168) 2019-10-16 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 5I4Iw... to oTVah... (flutter/engine#13167) 2019-10-16 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from qpzUe... to KVDL4... (flutter/engine#13166) 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 634d15032d37..7274850f96f2 (3 commits) (flutter/engine#13165) 2019-10-16 yjbanov@google.com Move surface-based SceneBuilder implementation under surface/ (flutter/engine#13159) 2019-10-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia ba8752f37dab..634d15032d37 (2 commits) (flutter/engine#13164) 2019-10-16 chinmaygarde@gmail.com Revert "Issue 13238: on iOS, force an orientation change when the current orientation is not allowed" (flutter/engine#13160) 2019-10-15 chinmaygarde@google.com Roll buildroot to pull in static thread safety analysis options. (flutter/engine#13155) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia fb6a1abe4567..ba8752f37dab (8 commits) (flutter/engine#13156) 2019-10-15 chinmaygarde@google.com Make the Dart isolate constructor private. (flutter/engine#13153) 2019-10-15 iska.kaushik@gmail.com Revert "Upgrades the ICU version to 64.2 (flutter#13123)" (flutter/engine#13146) 2019-10-15 1541038+josh-ksr@users.noreply.github.com Issue 13238: on iOS, force an orientation change when the current orientation is not allowed (flutter/engine#12295) 2019-10-15 chinmaygarde@google.com Allow embedders to specify a render task runner description. (flutter/engine#13124) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from Jv4XM... to 5I4Iw... (flutter/engine#13150) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from i5xD1... to qpzUe... (flutter/engine#13149) 2019-10-15 bkonyi@google.com Roll src/third_party/dart fc933312f7..4131d3d7c4 (3 commits) 2019-10-15 chinmaygarde@google.com Document //flutter/runtime/dart_vm (flutter/engine#13144) 2019-10-15 iska.kaushik@gmail.com Revert "Enable/tweak web sdk source maps (flutter#13141)" (flutter/engine#13148) 2019-10-15 jason-simmons@users.noreply.github.com Merge the Fuchsia frontend_server build script into the new flutter_frontend_server target (flutter/engine#13145) 2019-10-15 iska.kaushik@gmail.com Add `flutter_tester` binary to the CIPD package (flutter/engine#13143) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia f22c57ddcc8c..fb6a1abe4567 (2 commits) (flutter/engine#13142) 2019-10-15 vsm@google.com Enable/tweak web sdk source maps (flutter/engine#13141) 2019-10-15 filmil@gmail.com Upgrades the ICU version to 64.2 (flutter/engine#13123) 2019-10-15 rmacnak@google.com [frontend_server] Include bytecode generation in the training run. (flutter/engine#13126) 2019-10-15 wvvwwvw@gmail.com Support empty strings and vectors in standard codec (flutter/engine#12974) 2019-10-15 bkonyi@google.com Roll src/third_party/dart 50f7ae9c5d..fc933312f7 (2 commits) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia 55f9cba6e2e7..f22c57ddcc8c (1 commits) (flutter/engine#13136) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from xRgq0... to Jv4XM... (flutter/engine#13135) 2019-10-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from Lk7iT... to i5xD1... (flutter/engine#13134) 2019-10-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia 858cf233ef71..55f9cba6e2e7 (3 commits) (flutter/engine#13133) 2019-10-15 bkonyi@google.com Roll src/third_party/dart 70a7ef3f58..50f7ae9c5d (18 commits) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC franciscojma@google.com on the revert to ensure that a human is aware of the problem. To report a problem with the AutoRoller itself, please file a bug: https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug Documentation for the AutoRoller is here: ...

chinmaygarde requested review from cbracken, franciscojma86, jason-simmons and stuartmorgan-g October 14, 2019 22:27

googlebot added the cla: yes label Oct 14, 2019

chinmaygarde mentioned this pull request Oct 14, 2019

Crash under sendIndexedMeshToGpu when resizing macOS embedder flutter/flutter#17579

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jason-simmons reviewed Oct 14, 2019

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chinmaygarde commented Oct 14, 2019

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chinmaygarde force-pushed the custom_gpu_task_runner branch from aee0733 to 299f0d9 Compare October 15, 2019 00:50

chinmaygarde force-pushed the custom_gpu_task_runner branch from 299f0d9 to c63561e Compare October 15, 2019 00:51

franciscojma86 reviewed Oct 15, 2019

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chinmaygarde added 2 commits October 15, 2019 12:30

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jason-simmons approved these changes Oct 15, 2019

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chinmaygarde merged commit bf81971 into flutter:master Oct 15, 2019

chinmaygarde deleted the custom_gpu_task_runner branch October 15, 2019 21:26

pchampio mentioned this pull request Oct 16, 2019

Segmentation fault: 11 when resizing window on MacOS go-flutter-desktop/go-flutter#133

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Oct 16, 2019

bf81971 Allow embedders to specify a render task runner description. (f…

086e184

…lutter/engine#13124)

engine-flutter-autoroll mentioned this pull request Oct 16, 2019

Roll engine 540fc977bb6b..5e6c005ef1f9 (33 commits) flutter/flutter#42853

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pchampio mentioned this pull request Nov 10, 2019

use the same task runner for platform&render tasks go-flutter-desktop/go-flutter#308

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		~EmbedderTaskRunner() override;

		size_t GetEmbedderIdentifier() const;

Allow embedders to specify a render task runner description. #13124

Allow embedders to specify a render task runner description. #13124

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