1 //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
2 //  This source code is licensed under both the GPLv2 (found in the
3 //  COPYING file in the root directory) and Apache 2.0 License
4 //  (found in the LICENSE.Apache file in the root directory).
5 //
6 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
7 // Use of this source code is governed by a BSD-style license that can be
8 // found in the LICENSE file. See the AUTHORS file for names of contributors.
9 
10 #include <mutex>
11 
12 #include <rocksdb/env.h>
13 #include "port/win/env_win.h"
14 #include "test_util/sync_point.h"
15 #include "util/compression_context_cache.h"
16 #include "util/thread_local.h"
17 
18 namespace ROCKSDB_NAMESPACE {
19 namespace port {
20 
21 // We choose not to destroy the env because joining the threads from the
22 // system loader
23 //    which destroys the statics (same as from DLLMain) creates a system loader
24 //    dead-lock.
25 //    in this manner any remaining threads are terminated OK.
26 namespace {
27   std::once_flag winenv_once_flag;
28   Env* envptr;
29 };
30 }
31 
Default()32 Env* Env::Default() {
33   using namespace port;
34   ThreadLocalPtr::InitSingletons();
35   CompressionContextCache::InitSingleton();
36   INIT_SYNC_POINT_SINGLETONS();
37   std::call_once(winenv_once_flag, []() { envptr = new WinEnv(); });
38   return envptr;
39 }
40 
41 }  // namespace ROCKSDB_NAMESPACE
42