alibaba/tengine — pull request #484 by yunkai (2014-07-09 08:59:30+00:00)
Title: Shared keepalive v4

Changes in V4:
- Check process status before accessing shared memory.
- Continue to fix some coding style.
- Use ngx_process_idx as index when access idle_list.
- Reclaim connection into idle_list when send fd failed.