/*
 * 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.
 *
 * Copyright 2018 Danny Robson <danny@nerdcruft.net>
 */

#ifndef CRUFT_UTIL_JOB_FLAG_HPP
#define CRUFT_UTIL_JOB_FLAG_HPP

#include <atomic>

namespace util::job {
    /// a fire-once event that users can wait upon. if already fired then
    /// waiting will be a noop.
    class flag {
    public:
        flag ();

        void wait (void);

        int notify (void);
        int notify (int);

    private:
        std::atomic<int> value;
    };
};

#endif