Fix shutdown races and move signal blocking into profiler

runtime/vm/dart.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/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
 #include "vm/flags.h"
 #include "vm/freelist.h"
 #include "vm/handles.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/object_id_ring.h"
 #include "vm/port.h"
 #include "vm/profiler.h"
-#include "vm/signal_handler.h"
 #include "vm/simulator.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 #include "vm/thread_pool.h"
 #include "vm/virtual_memory.h"
 #include "vm/zone.h"
 
 namespace dart {
 
@@ skipping 135 matching lines @@
   Isolate::SetCurrent(vm_isolate_);
 
   // There is a planned and known asymmetry here: We exit one scope for the VM
   // isolate to account for the scope that was entered in Dart_InitOnce.
   Dart_ExitScope();
 
   ShutdownIsolate();
   vm_isolate_ = NULL;
 #endif
 
-  ScopedSignalBlocker ssb;
   ProfilerManager::Shutdown();
   CodeObservers::DeleteAll();
 
   return NULL;
 }
 
 
 Isolate* Dart::CreateIsolate(const char* name_prefix) {
   // Create a new isolate.
   Isolate* isolate = Isolate::Init(name_prefix);
@@ skipping 85 matching lines @@
   return predefined_handles_->handles_.AllocateScopedHandle();
 }
 
 
 bool Dart::IsReadOnlyHandle(uword address) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 }  // namespace dart