#ifndef INCLUDED_MAIL_MANAGER
#define INCLUDED_MAIL_MANAGER

#include "types.h"
#include "Sem.h"

class MailManager {
public:
    /* constructor */
    MailManager(unsigned int qsize = 32) ;

    virtual ~MailManager();

    /* functions */
    virtual void send(memaddr data);
    virtual memaddr recv();
    virtual int count();
    virtual void set_waiter(SemPtr w);

private:
    /* variables */
    memaddr *queue;
    unsigned int size;
    unsigned int read;
    unsigned int write;
    unsigned int mask;

    void calc_mask(unsigned int qsize);
    void extend();
}  ;

typedef MailManager *MailManagerPtr;

#endif