Allocate and return a new file number uint64_t NewFileNumber() { return next_file_number_++; }

Return the next filenumber uint64_t NextFileNumber() const { return next_file_number_; }

* atomic_add_return - add and return * @param v pointer of type atomic_t * @param i integer value to add * * Atomically adds i to v and returns i

* 停止easy_io */

* 等待easy_io */

* add string to table */

tolower

* 得到一header的value */

* 是IP地址, 如: xxx.xxx.xxx.xxx */

* 设置ip列表 */

* 加list到c->output上 */

* 需要初始化一下 */

* 切换给其他CPU */

Return the object that holds the edits to the descriptor done by this compaction.

used to prepare libev internal fd's */ this is not fork-safe */

The offset of the block in the file.

util function

LogAndApply() have no thread-safe protection

Return the current log file number.

Return the log file number for the log file that is currently being compacted, or zero if there is no such log file.

should drop this key no matter what condition.(user defined)