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::PrintErr(
+          "ThreadInterrupter disabled because a debugger is attached.\n");
+    }
+    return;
+  }
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter starting up.\n");
+    OS::PrintErr("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();
     }
   }
   ASSERT(interrupter_thread_id_ != OSThread::kInvalidThreadJoinId);
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter running.\n");
+    OS::PrintErr("ThreadInterrupter running.\n");
   }
 }
 
 
 void ThreadInterrupter::Shutdown() {
   {
     MonitorLocker shutdown_ml(monitor_);
     if (shutdown_) {
       // Already shutdown.
       return;
     }
     shutdown_ = true;
     // Notify.
     shutdown_ml.Notify();
     ASSERT(initialized_);
     if (FLAG_trace_thread_interrupter) {
-      OS::Print("ThreadInterrupter shutting down.\n");
+      OS::PrintErr("ThreadInterrupter shutting down.\n");
     }
   }
 
   // Join the thread.
   ASSERT(interrupter_thread_id_ != OSThread::kInvalidThreadJoinId);
   OSThread::Join(interrupter_thread_id_);
   interrupter_thread_id_ = OSThread::kInvalidThreadJoinId;
 
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter shut down.\n");
+    OS::PrintErr("ThreadInterrupter shut down.\n");
   }
 }
 
 
 // Delay between interrupts.
 void ThreadInterrupter::SetInterruptPeriod(intptr_t period) {
   if (shutdown_) {
     return;
   }
   ASSERT(initialized_);
@@ skipping 18 matching lines @@
     // Notify the interrupter to wake it from its deep sleep.
     ml.Notify();
   }
 }
 
 
 void ThreadInterrupter::ThreadMain(uword parameters) {
   ASSERT(initialized_);
   InstallSignalHandler();
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter thread running.\n");
+    OS::PrintErr("ThreadInterrupter thread running.\n");
   }
   {
     // Signal to main thread we are ready.
     MonitorLocker startup_ml(monitor_);
     OSThread* os_thread = OSThread::Current();
     ASSERT(os_thread != NULL);
     interrupter_thread_id_ = OSThread::GetCurrentThreadJoinId(os_thread);
     thread_running_ = true;
     startup_ml.Notify();
   }
@@ skipping 45 matching lines @@
         continue;
       }
 
       woken_up_ = false;
 
       ASSERT(current_wait_time_ != Monitor::kNoTimeout);
     }
   }
   RemoveSignalHandler();
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter thread exiting.\n");
+    OS::PrintErr("ThreadInterrupter thread exiting.\n");
   }
   {
     // Signal to main thread we are exiting.
     MonitorLocker shutdown_ml(monitor_);
     thread_running_ = false;
     shutdown_ml.Notify();
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart