Efficient C++ Performance Programming Techniques

Version 4: Implementation

Version 4 implements a multithreaded memory pool. It can handle any pool and lock type that conform to the expected interface:

template <class POOLTYPE, class LOCK>
class MTMemoryPool {
public:
    // Allocate an element from the freeList.
    inline void* alloc (size_t size);

    // Return an element to the freeList.
    inline void free (void* someElement);
private:
    POOLTYPE stPool;  // Single-threaded pool.
    LOCK      theLock;
};

The alloc() method delegates the allocation to the memory pool member, and the locking to the lock member, respectively:

 template <class M, class L> inline void* MTMemoryPool<M,L>::alloc (size_t size) { void * mem; theLock.lock(); mem = stPool.alloc(size); theLock.unlock(); return mem; } template <class M, class ...