Uses an open thread handle as the ThreadJoinId on Windows.

runtime/bin/thread.h

 // 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.
 
 #ifndef BIN_THREAD_H_
 #define BIN_THREAD_H_
 
 #include "platform/globals.h"
 
 namespace dart {
@@ skipping 33 matching lines @@
   static int Start(ThreadStartFunction function, uword parameters);
 
   static ThreadLocalKey CreateThreadLocal();
   static void DeleteThreadLocal(ThreadLocalKey key);
   static uword GetThreadLocal(ThreadLocalKey key) {
     return ThreadInlineImpl::GetThreadLocal(key);
   }
   static void SetThreadLocal(ThreadLocalKey key, uword value);
   static intptr_t GetMaxStackSize();
   static ThreadId GetCurrentThreadId();
-  static bool Join(ThreadId id);
   static intptr_t ThreadIdToIntPtr(ThreadId id);
   static bool Compare(ThreadId a, ThreadId b);
   static void GetThreadCpuUsage(ThreadId thread_id, int64_t* cpu_usage);
 
   static void InitOnce();
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Thread);
 };
@@ skipping 42 matching lines @@
   MonitorData data_;  // OS-specific data.
 
   DISALLOW_COPY_AND_ASSIGN(Monitor);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 
 #endif  // BIN_THREAD_H_