Make TimelineEventBlocks reclaimable

runtime/vm/isolate.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
@@ skipping 1497 matching lines @@
   // Close all the ports owned by this isolate.
   PortMap::ClosePorts(message_handler());
 
   // Fail fast if anybody tries to post any more messsages to this isolate.
   delete message_handler();
   set_message_handler(NULL);
 
   // Dump all accumulated timer data for the isolate.
   timer_list_.ReportTimers();
 
-  // Before analyzing the isolate's timeline blocks- close all of them.
-  CloseAllTimelineBlocks();
+  // Before analyzing the isolate's timeline blocks- reclaim all cached blocks.
+  ReclaimTimelineBlocks();
 
   // Dump all timing data for the isolate.
   if (FLAG_timing) {
     TimelinePauseTrace tpt;
     tpt.Print();
   }
 
   // Finalize any weak persistent handles with a non-null referent.
   FinalizeWeakPersistentHandlesVisitor visitor;
   api_state()->weak_persistent_handles().VisitHandles(&visitor);
@@ skipping 79 matching lines @@
 
   // TODO(5411455): For now just make sure there are no current isolates
   // as we are shutting down the isolate.
   Thread::ExitIsolate();
   // All threads should have exited by now.
   thread_registry()->CheckNotScheduled(this);
   Profiler::ShutdownProfilingForIsolate(this);
 }
 
 
-void Isolate::CloseAllTimelineBlocks() {
-  // Close all blocks
-  thread_registry_->CloseAllTimelineBlocks();
+void Isolate::ReclaimTimelineBlocks() {
   TimelineEventRecorder* recorder = Timeline::recorder();
-  if (recorder != NULL) {
-    MutexLocker ml(&recorder->lock_);
-    Thread::Current()->CloseTimelineBlock();
+  if (recorder == NULL) {
+    return;
   }
+  thread_registry_->ReclaimTimelineBlocks();
 }
 
 
 Dart_IsolateCreateCallback Isolate::create_callback_ = NULL;
 Dart_IsolateInterruptCallback Isolate::interrupt_callback_ = NULL;
 Dart_IsolateUnhandledExceptionCallback
     Isolate::unhandled_exception_callback_ = NULL;
 Dart_IsolateShutdownCallback Isolate::shutdown_callback_ = NULL;
 Dart_FileOpenCallback Isolate::file_open_callback_ = NULL;
 Dart_FileReadCallback Isolate::file_read_callback_ = NULL;
@@ skipping 857 matching lines @@
                            serialized_message_, serialized_message_len_);
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(I);
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart