* Implement sync flush option, where data is written synchronously on disk when a command is executed.
* Implement MULTI/EXEC as transaction abstract API to diskstore.c, with transaction_start, transaction_end, and a journal to recover.
* Stop BGSAVE thread on shutdown and any other condition where the child is killed during normal bgsave.
* Implement sync flush option, where data is written synchronously on disk when a command is executed.
* Implement MULTI/EXEC as transaction abstract API to diskstore.c, with transaction_start, transaction_end, and a journal to recover.
* Stop BGSAVE thread on shutdown and any other condition where the child is killed during normal bgsave.