#ifndef MT_SEMAPHORE_H
#define MT_SEMAPHORE_H

#include "base.h"

#include <semaphore.h>

namespace mt
{

class semaphore
{
	MT_PREVENT_COPY(semaphore)

	public:

		typedef semaphore this_type;
		typedef void      base_type;

		semaphore(void)
		{
			sem_init(&(this->s), 0, 0);
		}

		semaphore(int value)
		{
			sem_init(&(this->s), 0, value);
		}

		~semaphore(void)
		{
			sem_destroy(&(this->s));
		}

		void post(void)
		{
			sem_post(&(this->s));
		}

                /*
		void post(int n)
		{
			sem_post_multiple(&(this->s), n);
		}
                */

		void wait(void)
		{
			sem_wait(&(this->s));
		}

		bool trywait(void)
		{
			return (sem_trywait(&(this->s)) == 0);
		}

		//jnoguera 11-Nov-2011
		int available()
		{
			int value;
			sem_getvalue( &(this->s), &value );
			return value;
		}

	private:

		sem_t s;
};

}

#endif // MT_SEMAPHORE_H