mirror of https://github.com/facebook/rocksdb.git
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
|
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
||
|
|
// This source code is licensed under the BSD-style license found in the
|
||
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
||
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
||
|
|
//
|
||
|
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style license that can be
|
||
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
||
|
|
|
||
|
|
#include <mutex>
|
||
|
|
|
||
|
|
#include <rocksdb/env.h>
|
||
|
|
#include "port/win/env_win.h"
|
||
|
|
|
||
|
|
namespace rocksdb {
|
||
|
|
namespace port {
|
||
|
|
|
||
|
|
// We choose to create this on the heap and using std::once for the following
|
||
|
|
// reasons
|
||
|
|
// 1) Currently available MS compiler does not implement atomic C++11
|
||
|
|
// initialization of
|
||
|
|
// function local statics
|
||
|
|
// 2) We choose not to destroy the env because joining the threads from the
|
||
|
|
// system loader
|
||
|
|
// which destroys the statics (same as from DLLMain) creates a system loader
|
||
|
|
// dead-lock.
|
||
|
|
// in this manner any remaining threads are terminated OK.
|
||
|
|
namespace {
|
||
|
|
std::once_flag winenv_once_flag;
|
||
|
|
Env* envptr;
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
Env* Env::Default() {
|
||
|
|
using namespace port;
|
||
|
|
std::call_once(winenv_once_flag, []() { envptr = new WinEnv(); });
|
||
|
|
return envptr;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|