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lockedresource.hpp
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lockedresource.hpp
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#ifndef lockedresource_hpp
#define lockedresource_hpp
#include <boost/thread/recursive_mutex.hpp>
#include "types.hpp"
namespace dfterm {
template<class T> class LockedObject;
template<class T> class LockedResource;
/* A proxy class, that can be used to force locking (mutex lock) on
objects before use. Can't be copied. */
template<class T>
class LockedResource
{
private:
boost::recursive_mutex resource_mutex;
T object;
/* No copies */
LockedResource& operator=(const LockedResource &lr) { return (*this); };
LockedResource(const LockedResource &lr) { };
public:
~LockedResource()
{
boost::lock_guard<boost::recursive_mutex> m(resource_mutex);
};
LockedResource()
{
}
/* Locks the resource and returns pointer.
Only one thread will be able to lock the resource
at a time. When done with it, call LockedObject::release()
or destroy the object. (locks are released on destructor) */
LockedObject<T> lock()
{
return LockedObject<T>(&object, &resource_mutex);
}
};
template<class T>
class LockedObject
{
friend class LockedResource<T>;
private:
T* object;
SP<boost::unique_lock<boost::recursive_mutex> > object_lock;
LockedObject(T* object, boost::recursive_mutex* rmutex)
{
object_lock = SP<boost::unique_lock<boost::recursive_mutex> >(new boost::unique_lock<boost::recursive_mutex>(boost::unique_lock<boost::recursive_mutex>(*rmutex)));
this->object = object;
}
public:
LockedObject()
{
object = (T*) 0;
}
LockedObject(const LockedObject &lo)
{
object = lo.object;
object_lock = lo.object_lock;
};
LockedObject& operator=(const LockedObject &lo)
{
if (this == &lo) return (*this);
object = lo.object;
object_lock = lo.object_lock;
return (*this);
}
T* get() { return object; };
const T* get() const { return object; };
T& operator*() { return (*object); };
T* operator->() { return object; };
const T& operator*() const { return (*object); };
const T* operator->() const { return object; };
void release() { object = (T*) 0; if (object_lock) object_lock->unlock(); };
};
};
#endif