Thread and Timeline fixes for Mojo.

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"
@@ skipping 96 matching lines @@
     thread_key_ = kUnsetThreadLocalKey;
 
     // Delete the global OSThread lock.
     ASSERT(thread_list_lock_ != NULL);
     delete thread_list_lock_;
     thread_list_lock_ = NULL;
   }
 }
 
 
-bool OSThread::IsThreadInList(ThreadId join_id) {
+OSThread* OSThread::CreateAndSetUnknownThread() {
+  ASSERT(OSThread::Current() == NULL);
+  OSThread* os_thread = new OSThread();
+  OSThread::SetCurrent(os_thread);
+  os_thread->set_name("Unknown");
+  return os_thread;
+}
+
+
+bool OSThread::IsThreadInList(ThreadJoinId join_id) {
   if (join_id == OSThread::kInvalidThreadJoinId) {
     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) {
@@ skipping 95 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