struct FPoolInfo
{
    DWORD       Bytes;      // Bytes allocated for pool.
    DWORD       OsBytes;    // Bytes aligned to page size.
    DWORD       Taken;      // Number of allocated elements in this pool, when counts down to zero can free the entire pool.
    BYTE*       Mem;        // Memory base.
    FPoolTable* Table;      // Index of pool.
    FFreeMem*   FirstMem;   // Pointer to first free memory in this pool.
    FPoolInfo*  Next;
    FPoolInfo** PrevLink;

    void Link( FPoolInfo*& Before )
    {
        if( Before )
        {
            Before->PrevLink = &Next;
        }
        Next     = Before;
        PrevLink = &Before;
        Before   = this;
    }
    void Unlink()
    {
        if( Next )
        {
            Next->PrevLink = PrevLink;
        }
        *PrevLink = Next;
    }
};

// Pool table.
struct FPoolTable
{
    FPoolInfo* FirstPool;
    FPoolInfo* ExhaustedPool;
    DWORD      BlockSize;
};