并发对象池提供boost :: shared_ptr
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我想实现一个并发对象池,在该池中返回shared_ptr,而无需将其显式返回到池中。我基本上在并发队列中为其分配了一个推入shared_ptrs的数组,并实现了一个自定义删除器。似乎可以工作。我有什么想念的吗?
#ifndef CONCURRENTOBJECTPOOL_H
#define CONCURRENTOBJECTPOOL_H
#include <boost/shared_ptr.hpp>
#include <boost/shared_array.hpp>
#include <tbb/concurrent_queue.h>
namespace COP
{
template<typename T>
class ConcurrentObjectPool;
namespace
{
template<typename T>
class ConcurrentObjectPoolDeletor
{
public:
ConcurrentObjectPoolDeletor(ConcurrentObjectPool<T>& aConcurrentObjectPool):
_concurrentObjectPool(aConcurrentObjectPool) {}
void operator()(T *p) const;
private:
ConcurrentObjectPool<T>& _concurrentObjectPool;
};
} // Anonymous namespace for ConcurrentObjectPoolDeletor
template <typename T>
class ConcurrentObjectPool
{
public:
ConcurrentObjectPool(const unsigned int aPoolSize)
: _goingDown(false),
_poolSize(aPoolSize),
_pool(new T[_poolSize]),
_ConcurrentObjectPoolDeletor(*this)
{
for(unsigned int i = 0; i < _poolSize; ++i)
{
boost::shared_ptr<T> curr(&_pool[i], _ConcurrentObjectPoolDeletor);
_objectQueue.push(curr);
}
}
boost::shared_ptr<T> loan()
{
boost::shared_ptr<T> curr;
_objectQueue.pop(curr);
return curr;
}
~ConcurrentObjectPool()
{
_goingDown = true;
_objectQueue.clear();
}
private:
void payBack(T * p)
{
if (! _goingDown)
{
boost::shared_ptr<T> curr(p, _ConcurrentObjectPoolDeletor);
_objectQueue.push(curr);
}
}
bool _goingDown;
const unsigned int _poolSize;
const boost::shared_array<T> _pool;
const ConcurrentObjectPoolDeletor<T> _ConcurrentObjectPoolDeletor;
tbb::concurrent_bounded_queue<boost::shared_ptr<T> > _objectQueue;
friend class ConcurrentObjectPoolDeletor<T>;
};
namespace
{
template<typename T>
void ConcurrentObjectPoolDeletor<T>::operator()(T *p) const
{
_concurrentObjectPool.payBack(p);
}
} // Anonymous namespace for ConcurrentObjectPoolDeletor
} // Namespace COP
#endif // CONCURRENTOBJECTPOOL_H
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2 个回复
缝皋
的析构函数中的
标志和读取
中的标志之间存在竞争。它可能导致内存泄漏。 实际上,如果不尝试使析构函数安全地与ѭ3并发运行,可能会更好。无论如何,这都不安全,因为
标志是池对象的一部分,因此在池被销毁后对其进行访问将导致未定义的行为-即所有对象必须在销毁之前返回到池中。
味芯憨