FifoCriticalSection.h

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#ifndef FIFOCRITICALSECTION_H
#define FIFOCRITICALSECTION_H

#include <ILockable.h>
#include <PtMutex.h>
#include <PtCondition.h>
#include <exception>
#include <list>

BOREALIS_NAMESPACE_BEGIN;

/*
  Guarantees first-come, first-serve access to a critical section.
 */
class FifoCriticalSection : public ILockable
{
public:
        FifoCriticalSection()
                throw (exception);

        // Behavior is undefined If you delete this object while at least one thread
        //  is awaiting or holding the lock.
        virtual ~FifoCriticalSection();
        
        // If an exception is thrown, the state of this object can no longer be
        // trusted.
        virtual void lock()
                throw (exception);
  
        // If an exception is thrown, the state of this object can no longer be
        // trusted.
        virtual void unlock()
                throw (exception);

private:
        PtMutex _mtx;
        list<PtCondition *> _waiters;
        bool _held;
};

BOREALIS_NAMESPACE_END;

#endif

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