Synchronized.h

/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2008. All Rights Reserved.                                                         */
/* Open Source Software - may be modified and shared by FRC teams. The code   */
/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib.  */
/*----------------------------------------------------------------------------*/

#ifndef SYNCHRONIZED_H
#define SYNCHRONIZED_H

#include <semLib.h>

#include "Base.h"

#define CRITICAL_REGION(s) { Synchronized _sync(s);
#define END_REGION }

class Synchronized;

class ReentrantSemaphore
{
public:
        explicit ReentrantSemaphore() {
                m_semaphore = semMCreate(SEM_Q_PRIORITY | SEM_DELETE_SAFE);
        }
        ~ReentrantSemaphore() {
                semDelete(m_semaphore);
        }

        int take() {
                return semTake(m_semaphore, WAIT_FOREVER);
        }

        int give() {
                return semGive(m_semaphore);
        }

private:
        SEM_ID m_semaphore;

        friend class Synchronized;
        DISALLOW_COPY_AND_ASSIGN(ReentrantSemaphore);
};

class Synchronized
{
public:
        explicit Synchronized(SEM_ID);
        explicit Synchronized(ReentrantSemaphore&);
        virtual ~Synchronized();
private:
        SEM_ID m_semaphore;

        DISALLOW_COPY_AND_ASSIGN(Synchronized);
};

#endif