thread.h

/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *     Copyright 2016 Couchbase, Inc
 *
 *   Licensed 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.
 */

#pragma once

#include <cstdint>

#include "core.h"

#if __APPLE__
/*
 * Apple's clang is awkward and disables thread_local keyword support
 * @todo Fixed in XCode 8 (MacOS 10.11.5 / 10.12 or later)
 */
#define THREAD_LOCAL __thread
#else
#define THREAD_LOCAL thread_local
#endif

namespace phosphor {
    namespace platform {

        PHOSPHOR_API
        int getCurrentProcessID();

        PHOSPHOR_API
        uint32_t getCurrentThreadID();

        inline uint32_t getCurrentThreadIDCached() {
            static THREAD_LOCAL uint32_t thread_id;

            if (unlikely(!thread_id)) {
                thread_id = getCurrentThreadID();
            }

            return thread_id;
        }
    }
}