Ensure that the ThreadInterrupter is awake after debugging

runtime/vm/debugger.cc

 // Copyright (c) 2012, 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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/deopt_instructions.h"
 #include "vm/flags.h"
 #include "vm/globals.h"
 #include "vm/longjump.h"
 #include "vm/json_stream.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/os.h"
 #include "vm/port.h"
 #include "vm/service_event.h"
 #include "vm/service_isolate.h"
 #include "vm/service.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
+#include "vm/thread_interrupter.h"
 #include "vm/visitor.h"
 
 
 namespace dart {
 
 DEFINE_FLAG(bool, show_invisible_frames, false,
             "Show invisible frames in debugger stack traces");
 DEFINE_FLAG(bool, trace_debugger_stacktrace, false,
             "Trace debugger stacktrace collection");
 DEFINE_FLAG(bool, verbose_debug, false, "Verbose debugger messages");
@@ skipping 2103 matching lines @@
     isolate_->set_single_step(true);
     // Find topmost caller that is debuggable.
     for (intptr_t i = 1; i < stack_trace->Length(); i++) {
       ActivationFrame* frame = stack_trace->FrameAt(i);
       if (frame->IsDebuggable()) {
         stepping_fp_ = frame->fp();
         break;
       }
     }
   }
+  if (!isolate_->single_step()) {
+    // We are no longer single stepping, make sure that the ThreadInterrupter
+    // is awake.
+    ThreadInterrupter::WakeUp();
+  }
 }
 
 
 // static
 bool Debugger::IsDebuggable(const Function& func) {
   if (!func.is_debuggable()) {
     return false;
   }
   if (ServiceIsolate::IsRunning()) {
     return true;
@@ skipping 533 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart