Disable the profiler when a debugger is attached

runtime/vm/thread_interrupter_linux.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 "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 
 #include "vm/flags.h"
@@ skipping 26 matching lines @@
     its.pc = SignalHandler::GetProgramCounter(mcontext);
     its.fp = SignalHandler::GetFramePointer(mcontext);
     its.csp = SignalHandler::GetCStackPointer(mcontext);
     its.dsp = SignalHandler::GetDartStackPointer(mcontext);
     its.lr = SignalHandler::GetLinkRegister(mcontext);
     Profiler::SampleThread(thread, its);
   }
 };
 
 
+bool ThreadInterrupter::IsDebuggerAttached() {
+  return false;
+}
+
+
 void ThreadInterrupter::InterruptThread(OSThread* thread) {
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter interrupting %p\n",
-              reinterpret_cast<void*>(thread->id()));
+    OS::PrintErr("ThreadInterrupter interrupting %p\n",
+                 reinterpret_cast<void*>(thread->id()));
   }
   int result = pthread_kill(thread->id(), SIGPROF);
   ASSERT((result == 0) || (result == ESRCH));
 }
 
 
 void ThreadInterrupter::InstallSignalHandler() {
   SignalHandler::Install<
       ThreadInterrupterLinux::ThreadInterruptSignalHandler>();
 }
 
 
 void ThreadInterrupter::RemoveSignalHandler() {
   SignalHandler::Remove();
 }
 
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)