src/butil/thread_local_inl.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

// Date: Tue Sep 16 12:39:12 CST 2014

#ifndef BUTIL_THREAD_LOCAL_INL_H
#define BUTIL_THREAD_LOCAL_INL_H

namespace butil {

namespace detail {

template <typename T>
class ThreadLocalHelper {
public:
    inline static T* get() {
        if (__builtin_expect(value != NULL, 1)) {
            return value;
        }
        value = new (std::nothrow) T;
        if (value != NULL) {
            butil::thread_atexit(delete_object<T>, value);
        }
        return value;
    }
    static BAIDU_THREAD_LOCAL T* value;
};

template <typename T> BAIDU_THREAD_LOCAL T* ThreadLocalHelper<T>::value = NULL;

}  // namespace detail

template <typename T> inline T* get_thread_local() {
    return detail::ThreadLocalHelper<T>::get();
}

}  // namespace butil

#endif  // BUTIL_THREAD_LOCAL_INL_H