Semaphore.hpp

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// @formatter:off
//
// Balau core C++ library
//
// Copyright (C) 2008 Bora Software (contact@borasoftware.com)
//
// Licensed under the Boost Software License - Version 1.0 - August 17th, 2003.
// See the LICENSE file for the full license text.
//


#ifndef COM_BORA_SOFTWARE__BALAU_CONCURRENT__SEMAPHORE
#define COM_BORA_SOFTWARE__BALAU_CONCURRENT__SEMAPHORE

#include <condition_variable>

namespace Balau::Concurrent {

class Semaphore {
    public: explicit Semaphore(unsigned int count_ = 0) : count(count_) {}

    public: void increment() {
        std::lock_guard<std::mutex> lock(mutex);
        ++count;
        conditionVariable.notify_one();
    }

    public: void decrement() {
        std::unique_lock<std::mutex> lock(mutex);

        while (count == 0) {
            conditionVariable.wait(lock);
        }

        --count;
    }


    private: std::mutex mutex;
    private: std::condition_variable conditionVariable;
    private: unsigned int count;
};

} // namespace Balau::Concurrent

#endif // COM_BORA_SOFTWARE__BALAU_CONCURRENT__SEMAPHORE