Disable the profiler when a debugger is attached

runtime/vm/thread_interrupter.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/thread_interrupter.h"
 
 #include "vm/flags.h"
 #include "vm/lockers.h"
 #include "vm/os.h"
 #include "vm/simulator.h"
@@ skipping 52 matching lines @@
 void ThreadInterrupter::InitOnce() {
   ASSERT(!initialized_);
   monitor_ = new Monitor();
   ASSERT(monitor_ != NULL);
   initialized_ = true;
 }
 
 
 void ThreadInterrupter::Startup() {
   ASSERT(initialized_);
+  if (IsDebuggerAttached()) {
+    MonitorLocker shutdown_ml(monitor_);
+    shutdown_ = true;
+    if (FLAG_trace_thread_interrupter) {
+      OS::Print("ThreadInterrupter disabled because a debugger is attached.\n");

[Vyacheslav Egorov (Google), 2017/02/09 17:14:05]

OS::PrintErr?

[Cutch, 2017/02/09 18:34:07]

Done here and elsewhere

+    }
+    return;
+  }
   if (FLAG_trace_thread_interrupter) {
     OS::Print("ThreadInterrupter starting up.\n");
   }
   ASSERT(interrupter_thread_id_ == OSThread::kInvalidThreadJoinId);
   {
     MonitorLocker startup_ml(monitor_);
     OSThread::Start("ThreadInterrupter", ThreadMain, 0);
     while (!thread_running_) {
       startup_ml.Wait();
     }
@@ skipping 138 matching lines @@
     // Signal to main thread we are exiting.
     MonitorLocker shutdown_ml(monitor_);
     thread_running_ = false;
     shutdown_ml.Notify();
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart