typedef struct wordCount {
    struct wordCount *self;
    long fd;
    long read_filesize;
    CPU_TYPE read_cpu;

    long size;             // remaining file size
    long division_size;    // for each word count task
    long division_out_size;
    long out_size;
    long out_size_;
    long task_num;         // remaining task count
    long task_blocks;      // spawn task one at a time
    long status_num;
    long task_spawned;
    unsigned long long *o_data;
    unsigned long long *head_tail_flag;
    long out_task_num;
    long pad;
    char * file_mmap;
    long file_size;
    HTaskPtr t_print;
    HTaskPtr t_exec;
} WordCount, *WordCountPtr;