Use ExitProcess on Windows.

runtime/bin/thread_win.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 "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/thread.h"
 
 #include <process.h>  // NOLINT
@@ skipping 86 matching lines @@
 }
 
 
 ThreadId Thread::GetCurrentThreadId() {
   return ::GetCurrentThreadId();
 }
 
 
 bool Thread::Join(ThreadId id) {
   HANDLE handle = OpenThread(SYNCHRONIZE, false, id);
-  if (handle == INVALID_HANDLE_VALUE) {
+
+  // TODO(zra): OSThread::Start() closes the handle to the thread. Thus, by the
+  // time we try to join the thread, its resources may have already been
+  // reclaimed, and joining will fail. This can be avoided in a couple of ways.
+  // First, GetCurrentThreadJoinId could call OpenThread and return a handle.
+  // This is bad, because each of those handles would have to be closed.
+  // Second OSThread could be refactored to no longer be AllStatic. Then the
+  // handle could be cached in the object by the Start method.
+  if (handle == NULL) {

[Cutch, 2015/10/28 20:33:15]

Should this be == INVALID_HANDLE_VALUE ?

[zra, 2015/10/28 21:40:04]

Oddly enough, OpenThread returns NULL on an error:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms684335(v=vs.85).aspx

     return false;
   }
+
   DWORD res = WaitForSingleObject(handle, INFINITE);
   CloseHandle(handle);
-  return res == WAIT_OBJECT_0;
+  ASSERT(res == WAIT_OBJECT_0);
+  return true;
 }
 
 
 intptr_t Thread::ThreadIdToIntPtr(ThreadId id) {
   ASSERT(sizeof(id) <= sizeof(intptr_t));
   return static_cast<intptr_t>(id);
 }
 
 
 bool Thread::Compare(ThreadId a, ThreadId b) {
@@ skipping 315 matching lines @@
   // signal. This will be treated as a spurious wake-up and is OK
   // since all uses of monitors should recheck the condition after a
   // Wait.
   data_.SignalAndRemoveAllWaiters();
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)