Automatic thread cleanup on non-Windows platforms.

runtime/vm/os_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 VM_OS_THREAD_H_
 #define VM_OS_THREAD_H_
 
 #include "platform/globals.h"
 #include "vm/allocation.h"
 
@@ skipping 12 matching lines @@
 
 namespace dart {
 
 // Low-level operations on OS platform threads.
 class OSThread : AllStatic {
  public:
   static ThreadLocalKey kUnsetThreadLocalKey;
   static ThreadId kInvalidThreadId;
 
   typedef void (*ThreadStartFunction) (uword parameter);
+  typedef void (*ThreadDestructor) (void* parameter);
 
   // Start a thread running the specified function. Returns 0 if the
   // thread started successfuly and a system specific error code if
   // the thread failed to start.
   static int Start(ThreadStartFunction function, uword parameters);
 
-  static ThreadLocalKey CreateThreadLocal();
+  // NOTE: Destructor currently ignored on Windows (issue 23474).
+  static ThreadLocalKey CreateThreadLocal(ThreadDestructor destructor = NULL);
   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);
@@ skipping 53 matching lines @@
   MonitorData data_;  // OS-specific data.
 
   DISALLOW_COPY_AND_ASSIGN(Monitor);
 };
 
 
 }  // namespace dart
 
 
 #endif  // VM_OS_THREAD_H_