Implement list isolates command

runtime/bin/dbg_message.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 "bin/dbg_connection.h"
 #include "bin/dbg_message.h"
 #include "bin/dartutils.h"
 #include "bin/thread.h"
 #include "bin/utils.h"
 
@@ skipping 1142 matching lines @@
         return;
       }
       iterator = queue;
       queue = queue->next();
     }
   }
   UNREACHABLE();
 }
 
 
+void DbgMsgQueueList::ListIsolateIds(dart::TextBuffer* msg) {
+  MutexLocker ml(&msg_queue_list_lock_);
+  if (list_ == NULL) {
+    return;  // No items in the list.
+  }
+  DbgMsgQueue* queue = list_;
+  msg->Printf("%"Pd64"", queue->isolate_id());
+  queue = queue->next();
+  while (queue != NULL) {
+    msg->Printf(",%"Pd64"", queue->isolate_id());
+    queue = queue->next();
+  }
+}
+
+
 void DbgMsgQueueList::BptResolvedHandler(Dart_IsolateId isolate_id,
                                          intptr_t bp_id,
                                          const Dart_CodeLocation& location) {
   Dart_EnterScope();
   dart::TextBuffer msg(128);
   msg.Printf("{ \"event\": \"breakpointResolved\", \"params\": {");
   msg.Printf("\"breakpointId\": %"Pd"", bp_id);
 
   msg.Printf(", \"isolateId\":%"Pd64"", isolate_id);
   ASSERT(!Dart_IsNull(location.script_url));
@@ skipping 51 matching lines @@
     msg_queue->SendIsolateEvent(isolate_id, kind);
     if (kind == kInterrupted) {
       msg_queue->HandleMessages();
     } else {
       ASSERT(kind == kShutdown);
       RemoveIsolateMsgQueue(isolate_id);
     }
   }
   Dart_ExitScope();
 }