ceph/src/rocksdb/port/win/env_default.cc

   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 "util/compression_context_cache.h"
  15 #include "util/sync_point.h"
  16 #include "util/thread_local.h"
  17
  18 namespace rocksdb {
  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
  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 }