Hang on android when DNS resolution is not done

webrtc/p2p/base/stunport.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 98 matching lines @@
   uint32_t start_time_;
 };
 
 UDPPort::AddressResolver::AddressResolver(
     rtc::PacketSocketFactory* factory)
     : socket_factory_(factory) {}
 
 UDPPort::AddressResolver::~AddressResolver() {
   for (ResolverMap::iterator it = resolvers_.begin();
        it != resolvers_.end(); ++it) {
-    it->second->Destroy(true);
+    // TODO(guoweis): Change to asynchronous DNS resolution to prevent the hang
+    // when passing true to the Destroy() which is a safer way to avoid the code
+    // unloaded before the thread exits. Please see webrtc bug 5139.
+    it->second->Destroy(false);
   }
 }
 
 void UDPPort::AddressResolver::Resolve(
     const rtc::SocketAddress& address) {
   if (resolvers_.find(address) != resolvers_.end())
     return;
 
   rtc::AsyncResolverInterface* resolver =
       socket_factory_->CreateAsyncResolver();
@@ skipping 346 matching lines @@
   const std::vector<Candidate>& existing_candidates = Candidates();
   std::vector<Candidate>::const_iterator it = existing_candidates.begin();
   for (; it != existing_candidates.end(); ++it) {
     if (it->address() == addr)
       return true;
   }
   return false;
 }
 
 }  // namespace cricket