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