Make TimelineEventBlocks reclaimable

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 5755 matching lines @@
   Isolate* isolate = Isolate::Current();
   CHECK_ISOLATE(isolate);
   if (consumer == NULL) {
     return false;
   }
   TimelineEventRecorder* timeline_recorder = Timeline::recorder();
   if (timeline_recorder == NULL) {
     // Nothing has been recorded.
     return false;
   }
-  // Suspend execution of other threads while serializing to JSON.
-  isolate->thread_registry()->SafepointThreads();
-  // TODO(johnmccutchan): Reclaim open blocks from isolate so we have a complete
-  // timeline.
+  // Reclaim all blocks cached by isolate.
+  Timeline::ReclaimIsolateBlocks();
   JSONStream js;
   IsolateTimelineEventFilter filter(isolate);
   timeline_recorder->PrintJSON(&js, &filter);
-  // Resume execution of other threads.
-  isolate->thread_registry()->ResumeAllThreads();
 
   // Copy output.
   char* output = NULL;
   intptr_t output_length = 0;
   js.Steal(const_cast<const char**>(&output), &output_length);
   if (output != NULL) {
     // Add one for the '\0' character.
     output_length++;
   }
   StreamToConsumer(consumer, user_data, output, output_length);
 
   // We stole the JSONStream's output buffer, free it.
   free(output);
   return true;
 }
 
 
 DART_EXPORT bool Dart_GlobalTimelineGetTrace(Dart_StreamConsumer consumer,
                                              void* user_data) {
   if (consumer == NULL) {
     return false;
   }
   TimelineEventRecorder* timeline_recorder = Timeline::recorder();
   if (timeline_recorder == NULL) {
     // Nothing has been recorded.
     return false;
   }
 
-  // TODO(johnmccutchan): Reclaim all open blocks from the system so we have
-  // a complete timeline.
+  // Reclaim all blocks cached in the system.
+  Timeline::ReclaimAllBlocks();
   JSONStream js;
   TimelineEventFilter filter;
   timeline_recorder->PrintJSON(&js, &filter);
 
   // Copy output.
   char* output = NULL;
   intptr_t output_length = 0;
   js.Steal(const_cast<const char**>(&output), &output_length);
   if (output != NULL) {
     // Add one for the '\0' character.
@@ skipping 176 matching lines @@
                                    ApiReallocate);
   writer.WriteFullSnapshot();
   *vm_isolate_snapshot_size = writer.VmIsolateSnapshotSize();
   *isolate_snapshot_size = writer.IsolateSnapshotSize();
   *instructions_snapshot_size = writer.InstructionsSnapshotSize();
 
   return Api::Success();
 }
 
 }  // namespace dart