Merge flutter/synchronization contents into fml. (#8525)

When flutter/synchronization was first authored, we did not own fml (it was called fxl then). Now we do, so use a single spot for such utilities. The pipeline was meant to be a general purpose utility that was only ever used by the animator (it even has animator specific tracing), so move that to shell instead (where the animator resides).

BUILD.gn

@@ -50,7 +50,6 @@ group("flutter") {
       "$flutter_root/runtime:runtime_unittests",
       "$flutter_root/shell/common:shell_unittests",
       "$flutter_root/shell/platform/embedder:embedder_unittests",
-      "$flutter_root/synchronization:synchronization_unittests",
       "$flutter_root/third_party/txt:txt_unittests",
     ]
 

ci/licenses_golden/licenses_flutter

@@ -219,6 +219,9 @@ FILE: ../../../flutter/fml/synchronization/atomic_object.h
 FILE: ../../../flutter/fml/synchronization/count_down_latch.cc
 FILE: ../../../flutter/fml/synchronization/count_down_latch.h
 FILE: ../../../flutter/fml/synchronization/count_down_latch_unittests.cc
+FILE: ../../../flutter/fml/synchronization/semaphore.cc
+FILE: ../../../flutter/fml/synchronization/semaphore.h
+FILE: ../../../flutter/fml/synchronization/semaphore_unittest.cc
 FILE: ../../../flutter/fml/synchronization/shared_mutex.h
 FILE: ../../../flutter/fml/synchronization/shared_mutex_std.cc
 FILE: ../../../flutter/fml/synchronization/shared_mutex_std.h
@@ -417,6 +420,8 @@ FILE: ../../../flutter/shell/common/isolate_configuration.cc
 FILE: ../../../flutter/shell/common/isolate_configuration.h
 FILE: ../../../flutter/shell/common/persistent_cache.cc
 FILE: ../../../flutter/shell/common/persistent_cache.h
+FILE: ../../../flutter/shell/common/pipeline.cc
+FILE: ../../../flutter/shell/common/pipeline.h
 FILE: ../../../flutter/shell/common/platform_view.cc
 FILE: ../../../flutter/shell/common/platform_view.h
 FILE: ../../../flutter/shell/common/rasterizer.cc
@@ -717,11 +722,6 @@ FILE: ../../../flutter/shell/platform/glfw/text_input_plugin.cc
 FILE: ../../../flutter/shell/platform/glfw/text_input_plugin.h
 FILE: ../../../flutter/sky/packages/flutter_services/lib/empty.dart
 FILE: ../../../flutter/sky/tools/roll/patches/chromium/android_build.patch
-FILE: ../../../flutter/synchronization/pipeline.cc
-FILE: ../../../flutter/synchronization/pipeline.h
-FILE: ../../../flutter/synchronization/semaphore.cc
-FILE: ../../../flutter/synchronization/semaphore.h
-FILE: ../../../flutter/synchronization/semaphore_unittest.cc
 FILE: ../../../flutter/third_party/txt/src/txt/platform.cc
 FILE: ../../../flutter/third_party/txt/src/txt/platform.h
 FILE: ../../../flutter/third_party/txt/src/txt/platform_android.cc

flow/BUILD.gn

@@ -65,7 +65,6 @@ source_set("flow") {
   deps = [
     "$flutter_root/common",
     "$flutter_root/fml",
-    "$flutter_root/synchronization",
     "//third_party/skia",
   ]
 

fml/BUILD.gn

@@ -50,6 +50,8 @@ source_set("fml") {
     "synchronization/atomic_object.h",
     "synchronization/count_down_latch.cc",
     "synchronization/count_down_latch.h",
+    "synchronization/semaphore.cc",
+    "synchronization/semaphore.h",
     "synchronization/shared_mutex.h",
     "synchronization/thread_annotations.h",
     "synchronization/waitable_event.cc",
@@ -188,6 +190,7 @@ executable("fml_unittests") {
     "paths_unittests.cc",
     "string_view_unittest.cc",
     "synchronization/count_down_latch_unittests.cc",
+    "synchronization/semaphore_unittest.cc",
     "synchronization/thread_annotations_unittest.cc",
     "synchronization/waitable_event_unittest.cc",
     "thread_local_unittests.cc",

synchronization/semaphore.cc → fml/synchronization/semaphore.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "flutter/synchronization/semaphore.h"
+#include "flutter/fml/synchronization/semaphore.h"
 
 #include "flutter/fml/build_config.h"
 #include "flutter/fml/logging.h"
@@ -10,7 +10,7 @@
 #if OS_MACOSX
 #include <dispatch/dispatch.h>
 
-namespace flutter {
+namespace fml {
 
 class PlatformSemaphore {
  public:
@@ -50,12 +50,12 @@ class PlatformSemaphore {
   FML_DISALLOW_COPY_AND_ASSIGN(PlatformSemaphore);
 };
 
-}  // namespace flutter
+}  // namespace fml
 
 #elif OS_WIN
 #include <windows.h>
 
-namespace flutter {
+namespace fml {
 
 class PlatformSemaphore {
  public:
@@ -91,13 +91,13 @@ class PlatformSemaphore {
   FML_DISALLOW_COPY_AND_ASSIGN(PlatformSemaphore);
 };
 
-}  // namespace flutter
+}  // namespace fml
 
 #else
 #include <semaphore.h>
 #include "flutter/fml/eintr_wrapper.h"
 
-namespace flutter {
+namespace fml {
 
 class PlatformSemaphore {
  public:
@@ -140,11 +140,11 @@ class PlatformSemaphore {
   FML_DISALLOW_COPY_AND_ASSIGN(PlatformSemaphore);
 };
 
-}  // namespace flutter
+}  // namespace fml
 
 #endif
 
-namespace flutter {
+namespace fml {
 
 Semaphore::Semaphore(uint32_t count) : _impl(new PlatformSemaphore(count)) {}
 
@@ -162,4 +162,4 @@ void Semaphore::Signal() {
   return _impl->Signal();
 }
 
-}  // namespace flutter
+}  // namespace fml

synchronization/semaphore.h → fml/synchronization/semaphore.h

@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SYNCHRONIZATION_SEMAPHORE_H_
-#define SYNCHRONIZATION_SEMAPHORE_H_
+#ifndef FLUTTER_FML_SYNCHRONIZATION_SEMAPHORE_H_
+#define FLUTTER_FML_SYNCHRONIZATION_SEMAPHORE_H_
 
 #include <memory>
 
 #include "flutter/fml/compiler_specific.h"
 #include "flutter/fml/macros.h"
 
-namespace flutter {
+namespace fml {
 
 class PlatformSemaphore;
 
@@ -33,6 +33,6 @@ class Semaphore {
   FML_DISALLOW_COPY_AND_ASSIGN(Semaphore);
 };
 
-}  // namespace flutter
+}  // namespace fml
 
-#endif  // SYNCHRONIZATION_SEMAPHORE_H_
+#endif  // FLUTTER_FML_SYNCHRONIZATION_SEMAPHORE_H_

synchronization/semaphore_unittest.cc → fml/synchronization/semaphore_unittest.cc

@@ -4,21 +4,21 @@
 
 #include <thread>
 
-#include "flutter/synchronization/semaphore.h"
+#include "flutter/fml/synchronization/semaphore.h"
 #include "gtest/gtest.h"
 
 TEST(SemaphoreTest, SimpleValidity) {
-  flutter::Semaphore sem(100);
+  fml::Semaphore sem(100);
   ASSERT_TRUE(sem.IsValid());
 }
 
 TEST(SemaphoreTest, WaitOnZero) {
-  flutter::Semaphore sem(0);
+  fml::Semaphore sem(0);
   ASSERT_FALSE(sem.TryWait());
 }
 
 TEST(SemaphoreTest, WaitOnZeroSignalThenWait) {
-  flutter::Semaphore sem(0);
+  fml::Semaphore sem(0);
   ASSERT_FALSE(sem.TryWait());
   std::thread thread([&sem]() { sem.Signal(); });
   thread.join();

shell/common/BUILD.gn

@@ -68,6 +68,8 @@ source_set("common") {
     "isolate_configuration.h",
     "persistent_cache.cc",
     "persistent_cache.h",
+    "pipeline.cc",
+    "pipeline.h",
     "platform_view.cc",
     "platform_view.h",
     "rasterizer.cc",
@@ -99,7 +101,6 @@ source_set("common") {
     "$flutter_root/fml",
     "$flutter_root/lib/ui",
     "$flutter_root/runtime",
-    "$flutter_root/synchronization",
     "//third_party/dart/runtime:dart_api",
     "//third_party/skia",
   ]

shell/common/animator.h

@@ -10,11 +10,11 @@
 #include "flutter/common/task_runners.h"
 #include "flutter/fml/memory/ref_ptr.h"
 #include "flutter/fml/memory/weak_ptr.h"
+#include "flutter/fml/synchronization/semaphore.h"
 #include "flutter/fml/time/time_point.h"
+#include "flutter/shell/common/pipeline.h"
 #include "flutter/shell/common/rasterizer.h"
 #include "flutter/shell/common/vsync_waiter.h"
-#include "flutter/synchronization/pipeline.h"
-#include "flutter/synchronization/semaphore.h"
 
 namespace flutter {
 
@@ -74,7 +74,7 @@ class Animator final {
   fml::TimePoint last_begin_frame_time_;
   int64_t dart_frame_deadline_;
   fml::RefPtr<LayerTreePipeline> layer_tree_pipeline_;
-  Semaphore pending_frame_semaphore_;
+  fml::Semaphore pending_frame_semaphore_;
   LayerTreePipeline::ProducerContinuation producer_continuation_;
   int64_t frame_number_;
   bool paused_;

synchronization/pipeline.cc → shell/common/pipeline.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "flutter/synchronization/pipeline.h"
+#include "flutter/shell/common/pipeline.h"
 
 namespace flutter {
 

synchronization/pipeline.h → shell/common/pipeline.h

@@ -2,14 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SYNCHRONIZATION_PIPELINE_H_
-#define SYNCHRONIZATION_PIPELINE_H_
+#ifndef FLUTTER_SHELL_COMMON_PIPELINE_H_
+#define FLUTTER_SHELL_COMMON_PIPELINE_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/fml/memory/ref_counted.h"
+#include "flutter/fml/synchronization/semaphore.h"
 #include "flutter/fml/trace_event.h"
-#include "flutter/synchronization/pipeline.h"
-#include "flutter/synchronization/semaphore.h"
 
 #include <memory>
 #include <mutex>
@@ -142,8 +141,8 @@ class Pipeline : public fml::RefCountedThreadSafe<Pipeline<R>> {
   }
 
  private:
-  Semaphore empty_;
-  Semaphore available_;
+  fml::Semaphore empty_;
+  fml::Semaphore available_;
   std::mutex queue_mutex_;
   std::queue<std::pair<ResourcePtr, size_t>> queue_;
 
@@ -162,4 +161,4 @@ class Pipeline : public fml::RefCountedThreadSafe<Pipeline<R>> {
 
 }  // namespace flutter
 
-#endif  // SYNCHRONIZATION_PIPELINE_H_
+#endif  // FLUTTER_SHELL_COMMON_PIPELINE_H_

shell/common/rasterizer.h

@@ -14,8 +14,8 @@
 #include "flutter/fml/memory/weak_ptr.h"
 #include "flutter/fml/synchronization/waitable_event.h"
 #include "flutter/lib/ui/snapshot_delegate.h"
+#include "flutter/shell/common/pipeline.h"
 #include "flutter/shell/common/surface.h"
-#include "flutter/synchronization/pipeline.h"
 
 namespace flutter {
 

shell/gpu/BUILD.gn

@@ -11,7 +11,6 @@ gpu_common_deps = [
   "$flutter_root/flow",
   "$flutter_root/fml",
   "$flutter_root/shell/common",
-  "$flutter_root/synchronization",
   "//third_party/skia",
 ]
 

synchronization/BUILD.gn

-# Copyright 2013 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-source_set("synchronization") {
-  sources = [
-    "pipeline.cc",
-    "pipeline.h",
-    "semaphore.cc",
-    "semaphore.h",
-  ]
-
-  public_configs = [ "$flutter_root:config" ]
-
-  public_deps = [
-    "$flutter_root/fml",
-  ]
-}
-
-executable("synchronization_unittests") {
-  testonly = true
-
-  sources = [
-    "semaphore_unittest.cc",
-  ]
-
-  deps = [
-    ":synchronization",
-    "$flutter_root/testing",
-    "//third_party/dart/runtime:libdart_jit",
-  ]
-}

testing/run_tests.sh

@@ -38,9 +38,6 @@ echo "Running runtime_unittests..."
 echo "Running shell_unittests..."
 "$HOST_DIR/shell_unittests"
 
-echo "Running synchronization_unittests..."
-"$HOST_DIR/synchronization_unittests"
-
 echo "Running txt_unittests..."
 "$HOST_DIR/txt_unittests" --font-directory="$BUILDROOT_DIR/flutter/third_party/txt/third_party/fonts"