#ifndef ADHOCUTIL_SEMAPHORE_H
#define ADHOCUTIL_SEMAPHORE_H

// Borrowed from StackOverflow
// http://stackoverflow.com/questions/4792449/c0x-has-no-semaphores-how-to-synchronize-threads

#include <condition_variable>
#include <mutex>
#include "visibility.h"

namespace AdHoc {
	/// A portable semaphore with timeout support
	class DLL_PUBLIC Semaphore {
		public:
			/// Construct a new semaphore with optional initial count.
			Semaphore(unsigned int initial = 0);

			/// Notify one waiting thread.
			void notify();
			/// Wait for a single count.
			void wait();
			/// Wait for a single count with timeout.
			/// @param ms Timeout in milliseconds.
			bool wait(unsigned int ms);
			/// Free
			unsigned int freeCount() const;

		private:
			std::mutex mutex;
			std::condition_variable condition;
			unsigned long count;
	};
}

#endif