Sane asynchronous debugging and stack traces

runtime/vm/isolate.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/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 1150 matching lines @@
   MutexLocker ml(mutex_);
   // Check if we are in a valid state to make the isolate runnable.
   if (is_runnable() == true) {
     return false;  // Already runnable.
   }
   // Set the isolate as runnable and if we are being spawned schedule
   // isolate on thread pool for execution.
   ASSERT(object_store()->root_library() != Library::null());
   set_is_runnable(true);
 #ifndef PRODUCT
-  if (FLAG_support_debugger && !ServiceIsolate::IsServiceIsolate(this)) {
-    if (FLAG_pause_isolates_on_unhandled_exceptions) {
+  if (FLAG_support_debugger) {
+    debugger()->WhenRunnable();
+    if (FLAG_pause_isolates_on_unhandled_exceptions &&
+        !ServiceIsolate::IsServiceIsolate(this)) {
       debugger()->SetExceptionPauseInfo(kPauseOnUnhandledExceptions);
     }
   }
 #endif  // !PRODUCT
   IsolateSpawnState* state = spawn_state();
   if (state != NULL) {
     ASSERT(this == state->isolate());
     Run();
   }
 #ifndef PRODUCT
@@ skipping 1791 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart