Uses an open thread handle as the ThreadJoinId on Windows.

runtime/vm/os_thread.cc

 // Copyright (c) 2015, 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/os_thread.h"
 
 #include "vm/atomic.h"
 #include "vm/lockers.h"
 #include "vm/log.h"
 #include "vm/thread_interrupter.h"
 #include "vm/timeline.h"
 
 namespace dart {
 
 // The single thread local key which stores all the thread local data
 // for a thread.
 ThreadLocalKey OSThread::thread_key_ = kUnsetThreadLocalKey;
 OSThread* OSThread::thread_list_head_ = NULL;
 Mutex* OSThread::thread_list_lock_ = NULL;
 bool OSThread::creation_enabled_ = false;
 
 
 OSThread::OSThread() :
     BaseThread(true),
     id_(OSThread::GetCurrentThreadId()),
-    join_id_(OSThread::GetCurrentThreadJoinId()),
+#if defined(DEBUG)
+    join_id_(kInvalidThreadJoinId),
+#endif
     trace_id_(OSThread::GetCurrentThreadTraceId()),
     name_(NULL),
     timeline_block_lock_(new Mutex()),
     timeline_block_(NULL),
     thread_list_next_(NULL),
     thread_interrupt_disabled_(1),  // Thread interrupts disabled by default.
     log_(new class Log()),
     stack_base_(0),
     thread_(NULL) {
 }
@@ skipping 116 matching lines @@
   ASSERT(OSThread::GetCurrentTLS() == NULL);
   OSThread* os_thread = CreateOSThread();
   if (os_thread != NULL) {
     OSThread::SetCurrent(os_thread);
     os_thread->set_name("Unknown");
   }
   return os_thread;
 }
 
 
-bool OSThread::IsThreadInList(ThreadJoinId join_id) {
-  if (join_id == OSThread::kInvalidThreadJoinId) {
+bool OSThread::IsThreadInList(ThreadId id) {
+  if (id == OSThread::kInvalidThreadId) {
     return false;
   }
   OSThreadIterator it;
   while (it.HasNext()) {
     ASSERT(OSThread::thread_list_lock_->IsOwnedByCurrentThread());
     OSThread* t = it.Next();
     // An address test is not sufficient because the allocator may recycle
-    // the address for another Thread. Test against the thread's join id.
-    if (t->join_id() == join_id) {
+    // the address for another Thread. Test against the thread's id.
+    if (t->id() == id) {
       return true;
     }
   }
   return false;
 }
 
 
 void OSThread::DisableOSThreadCreation() {
   MutexLocker ml(thread_list_lock_);
   creation_enabled_ = false;
@@ skipping 99 matching lines @@
 
 OSThread* OSThreadIterator::Next() {
   ASSERT(OSThread::thread_list_lock_ != NULL);
   ASSERT(OSThread::thread_list_lock_->IsOwnedByCurrentThread());
   OSThread* current = next_;
   next_ = next_->thread_list_next_;
   return current;
 }
 
 }  // namespace dart